1. Introduction
The Shafir and Cheek (Reference Shafir and Cheek2024) commentary discussed our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) article, which reported an attempted replication of the 8 studies reported by Shafir (Reference Shafir1993). The studies in Shafir (Reference Shafir1993) tested 2 decision frames—choosing versus rejecting—in a variety of contexts, and the findings challenged conventional assumptions by revealing that the 2 decision frames are not always complementary. In our replication report, we concluded a mostly unsuccessful replication, with mixed support for the findings reported in Shafir (Reference Shafir1993), successfully replicating only 2 of the 8 scenarios. Using an extension, based on a suggestion in Shafir’s commentary replying to a failed replication of one scenario from Shafir (Reference Shafir1993) by Many Labs 2 (Klein et al., Reference Klein, Vianello and Hasselman2018), we provided an initial exploratory test of an alternative theoretical account using the same scenarios, and concluded that our data were suggestive of supporting an accentuation theoretical account (Wedell, Reference Wedell1997) rather than the compatibility theoretical account suggested in Shafir (Reference Shafir1993). The Shafir and Cheek (Reference Shafir and Cheek2024) commentary critiqued the definition and the value of direct replications, questioned our classification of the replication as a direct, very close replication, and argued that our process and evidence were an inadequate test of the phenomenon.
Going beyond the discussion about replications, the Shafir and Cheek (Reference Shafir and Cheek2024) commentary also shared a conceptual replication of 1 of the 8 scenarios Shafir (Reference Shafir1993), and we tested a scenario that neither we nor Many Labs 2 (Klein et al., Reference Klein, Vianello and Hasselman2018) found support for. The commentary argued that to truly test the phenomenon, one must ensure that certain theory-driven valence properties are present in the tested context, potentially by using a pilot of the features used in the vignettes. Following this argument, they demonstrated empirically that the original scenarios used in Shafir (Reference Shafir1993) do not align with their expected valence properties, and that with scenario modifications and item pretesting of 1 of the 8 scenarios, they were able to find support for the phenomenon.
We believe that this is an important dialogue and appreciate the opportunity to engage in a discussion regarding our replication attempt, our findings, and direct replications more broadly. We are encouraged by the commentary elaboration on their views regarding theory and generalizability limitations, the sharing of new suggested pretesting procedures, and the empirical demonstration of how the original stimuli can be updated. None of these are taken for granted or trivial, and they highlight a much-needed discussion about theories and empirical testing in judgment and decision-making that go far beyond our specific replication or the broader discussion on direct replications.
In this rejoinder, we clarify important aspects of our replication and process that we believe are relevant as a backdrop to the criticism raised by the commentary. We then address each of the issues raised and provide an in-depth discussion of the value and importance of direct replications and open science. Our summary of the rebuttal of the key points raised in the commentary is summarized in Table 1.
In Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021), we reported a pre-registered replication and extension of a seminal paper by Shafir (Reference Shafir1993) that documented several paradigms showing different behaviors when comparing decisions of ‘choosing’ versus decisions of ‘rejecting’. Briefly, the studies in Shafir (Reference Shafir1993) reported that a choice set with ‘enriched’ options, which had more positive and more negative attributes compared with an ‘impoverished’ option, was more likely to be both chosen and rejected. The suggested explanation for these effects was that of ‘compatibility’, in that choosing leads to an emphasis on strengths, whereas rejecting leads to an emphasis on weaknesses, resulting in the enriched option receiving a higher ratio of choice and rejection.
The Many Labs 2 mass collaboration (Klein et al., Reference Klein, Vianello and Hasselman2018) conducted—among many other replications—an initial partial replication of the work by Shafir (Reference Shafir1993) focusing only on Problem 1, concluding a failure to replicate the effect. In a reply to the effort, the Shafir (Reference Shafir2018) commentary raised several important limitations of that replication, arguing that the replication (1) was not a comprehensive replication of all scenarios, (2) lacked counterbalancing in the presentation of the alternatives, and (3) may have been unsuccessful due to the possibility that the meaning of some of these scenarios has changed over time. The commentary went further to mention Wedell (Reference Wedell1997) as an alternative account with an ‘accentuation’ hypothesis, stating that: ‘The experimental findings suggest that there are at least two distinct influences on simple binary choices of the kind considered here. Compatibility, the effect I attributed my findings to raises the weights of attributes compatible with the task at hand; accentuation, as proposed by Wedell (Reference Wedell1997), leads to greater weighting of attribute differences in choice than in rejection’ (p. 496).
Our replication addressed this exchange and was a step forward in helping the community make progress in understanding the phenomenon. We addressed the first 2 concerns raised by Shafir, as we attempted a replication of all 8 problems reported, and added several improvements, such as the counterbalancing of the display of the options. Furthermore, we added an exploratory extension that allowed testing for the possibility of the accentuation alternative account that Shafir suggested.
In our replication, we concluded that ‘we found no consistent support for the hypotheses across the eight problems: two had similar effects, two had opposite effects, and four showed no effects’ (underline not in original text). Although we consider the aggregated findings as a failure to replicate the findings of the target article as a whole, we tried to be very careful in how we framed our findings, and we note we deliberately framed those as a failure to find consistent support, rather than a failure to find any support, and failure to find consistent support specifically for the target article’s findings, rather than a failure to find support for findings regarding the phenomenon all together. We also reiterate that our findings were not random noise, nor were they only representing null effects, and our findings were not a complete failure to find any support for the phenomenon. Quite the contrary, we found support for the phenomenon in 2 of the 8 scenarios, and using our added extension, we suggested support for an alternative account to Shafir’s, one that Shafir (Reference Shafir2018) specifically suggested in his commentary reply to Many Labs 2 (Klein et al., Reference Klein, Vianello and Hasselman2018). This means that using the original stimuli from the 1990s, with no additional modifications, we found support for the phenomenon in 2 of the scenarios, and overall concluded support for a pattern of results that was suggested in the literature following Shafir (Wedell, Reference Wedell1997), one which he himself pointed to when writing a commentary to Many Labs 2 (Shafir, Reference Shafir2018).
The commentary noted that we ‘conclude[d] that a decades-old finding “does not replicate”’ (p. 8) and, in their pushback, argued that ‘all that replicators should be free to conclude is that the original materials, years later, or in different contexts, do not produce the same pattern of results, a finding that we find of limited insight by itself’ (p. 8).
In fact, what they suggested we should conclude was exactly what we concluded in our replication. We opened our discussion section with the following: ‘We successfully replicated the results of Problem 4 and Problem 5 of the original study. However, in Problems 7 and 8, we found effects in the direction opposite to the original findings, and our findings for Problems 1, 2, 3, and 6 indicated support for the null hypothesis’. We further wrote that ‘our replication does not rule out the compatibility account, only indicates that it is in need of further elaboration and specification, and further testing, and we see much promise in examining the interaction of the two accounts’. And that ‘we recommend that other compatibility hypothesis stimuli be revisited with direct close replications or that new stimuli be developed before further expanding on the compatibility hypothesis’.
The commentary criticized our classification of our replication as a ‘very close replication’, arguing that ‘very close replications do not seem, from a theoretical perspective, very close after all’ (p. 8), emphasizing what seems like theoretical closeness over empirical closeness.
On that point, we reiterate what we wrote in our replication and clarify that our categorization used LeBel et al.’s (Reference LeBel, McCarthy, Earp, Elson and Vanpaemel2018) taxonomy. To the best of our knowledge, this is the most common taxonomy of replications currently available, and we have employed it successfully throughout our many published replications. The commentary criticizes several aspects of the ‘very close’ categorization, especially regarding what they refer to as a ‘theoretical perspective’. We feel that this is an important debate to have as a community, and we would welcome a broader debate to improve that taxonomy and further suggestions and examples on how to evaluate and pursue theoretical closeness. We come back to this point when we discuss the value of direct, very close replications.
The commentary criticized the value of direct replications, and so in this section, we aimed to chronologically outline the replications that took place in the process, since the publication of Shafir (Reference Shafir1993), and through that to clarify the value that we see in direct replications and their contributions to the understanding of the focal findings. The main stages in this process are summarized in Table 2.
Table 2 Timeline of scientific process and studies conducted following the publication of Shafir (Reference Shafir1993)
Many Labs 2 conducted the first published replication of the findings by Shafir (Reference Shafir1993). A follow-up commentary by Shafir (Reference Shafir2018) raised several methodological concerns, sharing that they also conducted replications of the findings by Shafir (Reference Shafir1993) and wrote (p. 496):
In follow-up work, my student Nathan Cheek and I have run several studies intended to further clarify these apparently conflicting patterns. In a working paper (Cheek and Shafir, Reference Cheek and Shafir2018), we show that the original pattern is easy to replicate and that the pattern predicted by Wedell and observed in Many Labs 2 is also easy to document, and we further consider the cognitive mechanisms that might account for both.
Our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) replication addressed some of the points raised in that Shafir (1998) commentary by conducting an additional direct replication of all 8 scenarios reported in Shafir (Reference Shafir1993) with the counterbalancing of options.
In the commentary by Shafir and Cheek (Reference Shafir and Cheek2024) on our replication, the authors again shared that they conducted additional unpublished replications (p. 8):
The published direct replications by Many Labs 2 and Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) are important because they are the only available public reports of a replicability assessment of the original findings by Shafir (Reference Shafir1993) as is. Those direct replications are also important because they set in motion the publishing of the commentaries by Shafir (Reference Shafir2018) and Shafir and Cheek (Reference Shafir and Cheek2024), which have raised new contestations and understandings that were not fully articulated in Shafir (Reference Shafir1993). Direct replications, therefore, help ensure that science can progress in studying a phenomenon by (1) assessing the replicability of the original findings using very similar conditions and stimuli, (2) eliciting public sharing of implicit knowledge and vital information not clearly communicated in the reporting of the original findings, and (3) motivating further public discussions regarding how to best further study the phenomenon. Without those, the public would only see the original studies by Shafir (Reference Shafir1993), making it unclear whether the empirical findings reported in that article contain all that is needed for others to build on those findings, are replicable as is, and are up to date.
The commentaries by Shafir (Reference Shafir2018) and Shafir and Cheek (Reference Shafir and Cheek2024) also briefly mentioned details and empirical evidence that would have helped progress our understanding of the phenomenon and the needed methods even further: (1) the process and pretests of the original findings from the target article, (2) the findings of the first reported failed direct replication and the procedures and materials of the adjusted scenario(s) replication from their response to the Many Labs 2 replication (Cheek and Shafir, Reference Cheek and Shafir2018), and (3) the failed direct replications in response to our replication (Cheek and Shafir, Reference Cheek and Shafir2024). It is unfortunate that neither of the commentaries further elaborated on their own failed direct replications nor on any of the details regarding the successful adjusted and conceptual replications. These would have been very helpful for the community and for us in our replication, so that we can all examine and learn from what the commentaries’ authors did to make needed adjustments. We consider this a missed opportunity. Without access to further details about these studies, we as a community cannot verify, evaluate, or learn from the experience gained, and thus they remain implicit knowledge by the commentaries’ authors. We kindly ask the commentaries’ authors to follow up and share all the empirical evidence they have conducted regarding this phenomenon. This can be easily done through uploading all materials, data, and code to a publicly open and citable project on the Open Science Framework (osf.io) or Research Box (researchbox.org), and does not require a manuscript and going through a lengthy peer review.
To gain a better understanding of the phenomenon, it is crucial to publicly share all replications, direct and conceptual, successful and failed, by original authors and others in the community, even as preprints or public projects. The community needs to be able to evaluate claimed scientific evidence. For trust in science to be established and warranted, it is essential that scientific reporting is transparent, thereby enhancing the ability to assess the quality of research with greater certainty (Vazire, Reference Vazire2017).
6. Challenges in interpreting direct replication results: Hindsight, outcome, and confirmation biases
The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) argued that replications ‘can be highly misleading’ and that our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) replication of Shafir (Reference Shafir1993) is further ‘exacerbating replication concerns’. Such arguments are often raised when the findings of the replication are not consistent with the findings reported by the original studies, resulting in criticism of direct replications as inherently flawed for not addressing any of the countless possible factors raised post hoc and therefore being of no value. In this section, we discuss the issues with post hoc outcome-based interpretations of direct replications and caution against possible hindsight, outcome, and confirmation biases in critiquing results of direct replications after the fact.
One of the challenges with results-based arguments for problems with direct replications is that these arguments are commonly limited to failures, and yet some direct replications succeed in replicating original findings. Our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) was part of a mass collaboration effort in which we concluded over 120 replications of classic effects in the judgment and decision-making and social psychology literature (CORE, 2025). As part of this effort, in addition to the replication by Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021), we completed replications of many other classic articles from the same time as the studies reported by Shafir (Reference Shafir1993). For example, in Ziano et al. (Reference Ziano, Li, Tsun, Lei, Kamath, Cheng and Feldman2021), we concluded a successful replication of a classic article by Shafir et al. (Reference Shafir, Diamond and Tversky1997) regarding a phenomenon coined as the ‘money illusion’, the tendency to think about money in nominal rather than real terms. The stimuli from the 1990s were repeated as is in the replication, and included references to amounts of money that changed value over time due to inflation, economic terms that shifted over the 2 decades, and factors such as affect (e.g., happiness) and attitudes (e.g., job satisfaction) that may vary between samples and change over time. Despite the change in time, context, and samples, the results of the replication were very similar to those of the original findings, and out of the 4 problems, we concluded that 3 of the replication effects were consistent with the original findings (e.g., Problem 1; original: Cramer’s V = 0.26, 95% CI [0.17, 0.37]; replication: V = 0.28 [0.21, 0.36]), and one of the replication effects was stronger than the effect reported in the original studies.
The commentary argued that ‘what is clear is that some findings are going to be time-sensitive in ways that optical illusions are not’, yet we argue that it is not at all clear what is time-sensitive, and many of the phenomena that we attempted to replicate with the CORE (2025) team showed remarkable consistency over time. To establish what is and what is not time-specific, we need to regularly run replications and specifically direct replications.
Furthermore, some phenomena may replicate well across contexts and cultures, and it is not clear if the context matters until we test it in that context. For example, a Brazilian team has followed up some of our CORE (2025) team replications, reusing our materials, translating those to Portuguese, and running those with Brazilian samples. One of these replications is de Moraes Ferreira et al. (Reference de Moraes Ferreira, Santiago, Seda, Batistuzzo, Bastos, Borborema and Fatori2023), which repeated our Ziano et al. (Reference Ziano, Li, Tsun, Lei, Kamath, Cheng and Feldman2021) replication of Shafir et al. (Reference Shafir, Diamond and Tversky1997). They, too, concluded remarkably similar results to our successful replication. Before seeing the results, scholars could have argued either way, with both reasons why this would replicate well and reasons why this is doomed to fail. The best way to establish whether the results hold in a different country using a different language is to first repeat it with direct close replications only varying the language and sample.
These successful replications of Shafir et al. (Reference Shafir, Diamond and Tversky1997) are no coincidence. In the CORE (2025) team, we conducted many replications of classics dating back to the 1970s, and using different samples and contexts, our replication success rate has been relatively high (above 60%). In almost all of those replications, we reran the original stimuli and items with minimal to no adjustments. This goes to show that some of the JDM classics hold across time, context, and cultures, decades later.
We, therefore, need to be very careful with the criticism of direct replications only when results are negative and after the fact. Evaluating scientific outputs differently based on outcomes relates to the challenges of hindsight, outcome, and confirmation biases in the scientific process. For example, the publication of a successful replication is far less likely to result in further replications, conceptual adjustments, and public commentaries. If a replication’s findings are not fully consistent with the original findings, then it tends to elicit stronger negative evaluations of the replication, or of the replicators and/or their motivations. This is despite replications often meeting much higher standards than those by the target articles in that they are often pre-registered, much better powered with larger, more diverse samples, fully transparent in all their materials, data, and code, and adding extensions that help better understand the effect or clarify the effect in case of a failure.
Are the studies showing hindsight, outcome, and confirmation biases replicable, hold across time and context, and impact evaluations of replicability? Our evidence from the CORE (2025) team suggests that the answer to all of those questions is ‘yes’. Three of the target articles that we successfully replicated from the 1970s and the 1980s using very similar items with little to no adjustments were about these 3 biases. In Aiyer et al. (Reference Aiyer, Kam, Ng, Young, Shi and Feldman2023), we successfully replicated outcome bias demonstrated by Baron and Hershey (Reference Baron and Hershey1988) showing that a decision resulting in a positive outcome was evaluated as better, more important, and more normative than the same decision resulting in a negative outcome, even when participants were explicitly told to ignore the outcome and have themselves indicated to have ignored the outcome. In Chen et al. (Reference Chen, Kwan, Ma, Choi, Lo, Au and Feldman2021), we successfully replicated retrospective and prospective hindsight bias from Fischhoff (Reference Fischhoff1975) and Slovic and Fischhoff (Reference Slovic and Fischhoff1977). In our third study in Chen et al. (Reference Chen, Kwan, Ma, Choi, Lo, Au and Feldman2021), we showed hindsight and outcome bias regarding the replicability of hindsight bias. That is, we asked participants to predict the likelihood that a seminal study on hindsight bias (Fischhoff, Reference Fischhoff1975) would successfully replicate, in 3 conditions. In the ‘foresight’ condition, there was no indication of the outcome of our replication; in the ‘hindsight positive’ condition, we indicated that the replication outcome was successful and in support of the original findings; and in the ‘hindsight negative’ condition, we indicated that the replication outcome was negative and failed to find support for the original findings. In both hindsight conditions, participants were instructed to ignore the outcomes: ‘Answer as if you do not know the outcome, estimating the probabilities at that time before the replication study was launched’. We found that when estimating the likelihood of a successful replication of hindsight bias, participants in the hindsight positive condition rated the likelihood as higher than those in the foresight condition, who in turn rated the likelihood as higher than those in the hindsight negative condition.
Seeing the results of a replication triggers outcome bias and hindsight bias—it is unavoidable, even for those who consider themselves unbiased, and even when explicitly told to ignore the outcomes. For those who are invested in a certain outcome, an outcome different from expectations may trigger confirmation bias, in the rejection of conflicting evidence and in seeking other evidence that would confirm held beliefs.
Replications are especially tricky. When replications succeed, a common reaction is along the lines of: ‘Of course it would replicate, we knew it would all along, replicators conducted the replication well, but it is of no value, because we had the original findings.’ When replications fail, a common reaction is along the lines of: ‘of course it would fail, we knew it all along’ either questioning the competency of the replicators, the quality of their replication decisions, and/or raising post-hoc reasons for factors that may have led to the failure. This is not to say that there is no merit in the suggested factors, or that failures are not associated with issues regarding replicators and the replication process. The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) argued that their new evidence using a new pretesting procedure not documented in Shafir (Reference Shafir1993) demonstrated on only 1 of 8 scenarios from Shafir (Reference Shafir1993) shows that the evidence by Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) with comprehensive replications of all 8 scenarios using the same terms as in Shafir (Reference Shafir1993) is problematic and is of no value—‘a finding that we find of limited insight by itself’ (p. 8).
One of the key questions in assessing the methods of a replication is whether an expert examining the methods of the original studies against those of the replication, without seeing the replication outcomes, could have predicted the replication outcome and would have identified any critical flaws. Given that we followed the article by Shafir (Reference Shafir1993) closely, that the article did not specify any generalizability criteria, context limitations, or pretests referenced in the commentary by Shafir and Cheek (Reference Shafir and Cheek2024), and that there were no publicly shared additional updates to the original findings, we thought one would expect the original findings to replicate successfully. Even if not, the community should welcome additional evidence, and indeed a second commentary on our replication by Ganzach (Reference Ganzach2025) concluded that ‘I view Chandrashekar et al.’s (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) replication as a worthwhile contribution to our understanding of this effect’ (p. 3). It is unclear how replicators and researchers building on the work of Shafir (Reference Shafir1993) were expected to guess procedures needed for the effect to emerge, and it is only thanks to the publication of the findings in the direct replications and the follow-up commentaries that we can now publicly discuss more appropriate methods that address missing information, unclear theory, or implicit assumptions in the original studies. It is unclear how the community or public are expected to know that the original findings do not replicate as is if there are no public updates to the original findings.
Are there any ways to address hindsight, outcome, and confirmation biases? Yes—Registered Reports and masked-outcome peer review are 2 simple procedures that can at least partly address these biases. In the last 3 years, we have increasingly shifted our replications to Registered Reports, mostly conducting our Registered Reports through the revolutionary Peer Community in Registered Reports initiative (Feldman, Reference Feldman2024; Lloyd and Chambers, Reference Lloyd and Chambers2024), which has an open peer-review process. In our experience, the Registered Reports process has greatly reduced these biases and post hoc outcome-based criticism. When everyone agrees on the methods before data collection, and publication is guaranteed regardless of outcomes, then there is less room for these biases to impact the peer-review process and influence outcomes.
Ideally, replications would be done as Registered Reports (Chambers and Tzavella, Reference Chambers and Tzavella2022; Nosek and Lakens, Reference Nosek and Lakens2014; Soderberg et al., Reference Soderberg, Errington, Schiavone, Bottesini, Thorn, Vazire and Nosek2021), yet when this is not the case, such as when data and results already exist, another possible solution to address potential bias is to mask the editor and reviewers from the outcome, a process implemented by some journals like the Royal Society of Open Science (‘results-blind track’; Chambers and Tzavella, Reference Chambers and Tzavella2022; Woznyj et al., Reference Woznyj, Grenier, Ross, Banks and Rogelberg2018).
Shafir and Cheek’s commentary further reflected on direct close replications using the original items as being ‘problematic’ and ‘misleading’. We wholeheartedly disagree. Direct close replications are highly informative and greatly contribute to scientific progress and to the credibility of the scientific record. Replications have helped the original authors themselves revisit and reassess their own research, to share more from their previously unknown process of evaluating and choosing items, and now with new evidence using new items that demonstrate the phenomenon. Because of the new details we now have about the process, the public debate, and the evidence shared, the academic community and the public are all better off. Scholars that aim to build on the foundations of the choosing versus rejecting paradigms now have a better understanding of how to pursue such research, what works, and what does not, so that they do not invest more time and resources pursuing something using the wrong method or outdated items, and with new insights regarding the possibility of the 2 accounts discussed in the literature. This would not have come to light if it were not for the Many Labs 2 and our replications. Direct replications should be encouraged (Nosek et al., Reference Nosek, Hardwicke, Moshontz, Allard, Corker, Dreber and Vazire2022) and should become mainstream and common (Zwaan et al., Reference Zwaan, Etz, Lucas and Donnellan2018).
7. Replicators working with original authors and adversarial collaborations
The Shafir and Cheek (Reference Shafir and Cheek2024) commentary argued that it would be preferable for replicators to work in collaboration with original authors:
At a minimum, stimuli need to be revisited, in many circumstances preferably in collaboration with the original authors, to ensure that they afford a valid test of the original hypothesis (see also Fiedler et al., Reference Fiedler, McCaughey and Prager2021 on manipulation checks). (p. 8)
We disagree. First, there is no evidence that involving original authors helps improve replications or the probability of a successful replication. If anything, the evidence we have so far from mass collaborations shows no benefits of involving original authors. There are many empirical demonstrations, of which we will mention those we consider to be the most impactful. Many Labs 5 (Ebersole et al., Reference Ebersole, Mathur, Baranski, Bart-Plange, Buttrick, Chartier and Nosek2020) worked together with original authors to revisit 10 of the Reproducibility Project: Psychology (RP:P; Open Science Collaboration, 2015) over which original authors had expressed concerns regarding the replication designs before data collection. After working with the original authors, updating the protocols, and rerunning the studies, they concluded that ‘we found that the revised protocols produced effect sizes similar to those of the RP:P protocols (Δr = .002 or .014, depending on analytic approach)’. In McCarthy et al. (Reference McCarthy, Gervais, Aczel, Al-Kire, Aveyard, Marcella Baraldo and Zogmaister2021), many labs conducted replications of Srull and Wyer’s (Reference Srull and Wyer1979) hostile priming effect, for the second time (the first failed mass-lab replication attempt was McCarthy et al., Reference McCarthy, Skowronski, Verschuere, Meijer, Jim, Hoogesteyn, Orthey, Acar, Aczel, Bakos, Barbosa, Baskin, Bègue, Ben-Shakhar, Birt, Blatz, Charman, Claesen, Clay and Yıldız2018), this time conducting both direct replications and conceptual replications involving the original authors. They concluded that ‘the hostile priming effect for both the close replication (d = 0.09, 95% CI [−0.04, 0.22], z = 1.34, p = .16) and the conceptual replication with the involvement of the original authors (d = 0.05, 95% CI [−0.04, 0.15], z = 1.15, p = .58) were not significantly different from zero’ and that ‘we suggest that researchers should not invest more resources into trying to detect a hostile priming effect using methods like those described in Srull and Wyer (Reference Srull and Wyer1979)’. One of the original authors was involved in the entire process. Lastly, in one of social psychology’s most remarkable replication stories, following a mass replication effort by ego-depletion scholars that failed to find support for ego depletion (Hagger et al., Reference Hagger, Chatzisarantis, Alberts, Anggono, Batailler, Birt and Zwienenberg2016), original authors pushed back on both the choice of study and methods of the mass replications (Baumeister and Vohs, Reference Baumeister and Vohs2016), and proceeded to conduct their own mass replication attempt on a study of their choice only to conclude similar very weak to no effects (Vohs et al., Reference Vohs, Schmeichel, Lohmann, Gronau, Finley, Ainsworth and Albarracin2021).
Furthermore, the involvement of original authors in replications is sometimes (1) impossible, such as when authors have passed away, (2) unreasonable, such as when authors have left academia or retired, or (3) potentially extremely time-consuming or demanding, especially with highly impactful findings that elicit a lot of academic and public interest. With replications of old classics from decades ago, it is also sometimes the case that original authors do not have access to or remember much information regarding their published article or what took place, if it was not well-documented or kept.
Across our many replications, our experience in working with original authors has been very mixed. Some authors are a pleasure to engage and work with—they share everything they have, and provide support with constructive and objective feedback and suggestions. With others, there were issues that ranged from lack of responsiveness, hostility and/or long delays in replies, suspicion over motivations, deference to their authority and status, expectations of blind adherence to instructions given perceived expertise, and unreasonable to impossible requests and/or requirements.
For science, the best path forward is to ensure that anyone can conduct replications without the original authors. Original authors should publicly share as much as possible about their work to make replications possible and easy. As a community, we should encourage and potentially incentivize conducting and publishing external independent direct replications of published work. In Feldman (Reference Feldman2022), we called on researchers to adopt a ‘Check me, replicate me’ pledge inviting others to check and replicate their work, with incentives for finding mistakes. For anyone to spend their scarce time and resources to revisit and follow up on others’ work should be considered a valuable and important scientific pursuit. Original authors should consider replications as an opportunity for self-reflection—whether in improving the clarity, specificity, and falsifiability of their theories; enhancing the transparency of their methods and stimuli; or revisiting and possibly updating their own studies that would demonstrate stronger support for theories and evidence.
8. Pretesting items: Discussing Shafir and Cheek’s empirical demonstration
The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) included an empirical demonstration in which they reported a process of pretesting items in pilots that eventually led to what was concluded as a successful conceptual replication of 1 out of 8 scenarios from Shafir (Reference Shafir1993). We are glad that our replication resulted in further empirical work that has the potential to improve theoretical clarity, methods, measurement, and generalizability. These procedures were not previously shared or explained in Shafir (Reference Shafir1993) and—to the best of our knowledge—were not documented in any of the follow-up literature on this phenomenon; therefore, these are new procedures that serve as a good first step. Yet, to allow the community to learn from and build on that evidence, there are several gaps.
We outline remaining gaps regarding the evidence that was shared: (1) the demonstration was only conducted for 1 out of 8 scenarios, (2) it is unclear how the cutoff thresholds were determined, (3) it is unclear whether the measured valence in the commentary is different from the valence of the items in Shafir (Reference Shafir1993), given that Shafir (Reference Shafir1993) and the commentary did not provide the valence measurements for the items used in Shafir (Reference Shafir1993), and (4) the process of choosing the items and the used cutoff threshold were not pre-registered, and so it is not clear whether these were determine a priori or post hoc, and whether and how these should generalize to other scenarios. Below, we elaborate on each of those gaps in detail.
8.1. Empirical evidence: More information required
The Shafir and Cheek (Reference Shafir and Cheek2024) added pretesting of the valence for the attributes of 1 of 8 problems in Shafir (Reference Shafir1993), noting that:
Pilot testing when the Problem was first run had found that Parent A’s attributes were perceived as neutral, essentially offering no compelling reason to award or deny custody, whereas Parent B’s attributes were compatible with both choice and rejection. (p. 3)
The commentary then reported the findings of 2 pilot surveys that measured the valence of attributes used in the original scenario, as well as additional attributes, concluding that:
We found that the valence of some of the original attributes had changed. (p. 4)
Changed how and from what? It is unclear what the Shafir and Cheek (Reference Shafir and Cheek2024) evidence is indicative of having changed from, given that Shafir (Reference Shafir1993) did not report measuring any of those aspects, and so we have no way of comparing the two. The Shafir (1998) commentary on Many Labs 2 suggested the possibility that a similar procedure may have taken place in the studies reported in Shafir (Reference Shafir1993). The Shafir (1998) commentary simply read (p. 496):
When I devised the binary problems for my 1993 paper, I created enriched options that were preferred in choice, and then added negative attributes so that those options would also be rejected. This was a reasonable strategy to show compatibility, but it happened not to yield enriched options that were unpopular in choice, like those later created by Wedell, where a greater share of choice plus rejection can be obtained by the impoverished option.
Yet we have no access to the mentioned process or data, with the only mention of pretesting and manipulation checks in Shafir (Reference Shafir1993) was that (p. 549):
By way of manipulation checks, for each of the problems that follow, at least 85% of an independent group of subjects (N = 26) chose the enriched option as the option that has more reasons for and against it than the competing, impoverished option (p < .001 in all cases).
To evaluate the evidence and the claimed change in valence from 1993, it is essential that the data from Shafir (Reference Shafir1993) and the procedure behind it are shared, and not just for the 1 scenario (out of 8) that they tried to replicate in the Shafir and Cheek (Reference Shafir and Cheek2024) commentary. Without that data, what the Shafir and Cheek (Reference Shafir and Cheek2024) commentary showed was only that the evaluations at the time they reran these studies in 2022–23 were not aligned with their unspecified valence expectations.
8.2. The need for fully specified, clearly testable, and falsifiable methods
Shafir and Cheek (Reference Shafir and Cheek2024)’s commentary argued that direct replications are of limited value because the original items should not have been used as is, and that for evidence supporting the phenomenon to be found, scholars need to follow a procedure of pretesting the valence of items and selecting specific items that meet unspecified criteria.
We find this argument puzzling, given that both commentaries by Shafir (Reference Shafir2018) and Shafir and Cheek (Reference Shafir and Cheek2024) reported to have, at least twice, ran replications using the original items without going through any updating pretesting procedures. If the pretesting is taken for granted and there is no value in conducting direct replications, then why invest resources in conducting those? It is also unclear whether this procedure was part of the original studies in Shafir (Reference Shafir1993) and if so—what exactly took place. It is a missed opportunity that both follow-up commentaries did not aim to fill that gap by sharing everything. Therefore, we call on the commentary’s authors to further clarify and better specify under what circumstances they consider pretesting a crucial test of the theory and related phenomenon, and to share all that they have that is relevant for that process from their empirical investigations.
The commentary seemed to argue that the value of the direct replications is limited because the replications did not use a piloting procedure, yet given that the suggested pretesting procedure is new, we are unsure how anyone was expected to follow it. Even with the provided evidence, given that it is not fully tested and underspecified, we are still unsure how anyone is expected to implement it for other empirical demonstrations. Replicators could not be expected to guess what needs to be done in order to test and demonstrate a phenomenon, or to guess the limitations on the generalizability of the stimuli. Our view is that, in science, everything should be clearly specified and should not involve unspecified procedures and assumptions, or require implicit knowledge. We are therefore grateful that, at least for one of the scenarios, the pretesting of the factors in the scenarios is a bit clearer. In future studies, we recommend making all procedures transparent and clear, sharing all that has taken place to result in the reported findings, clearly stating the procedures needed to conduct the investigation again in a different context and time, and setting a priori falsifiable criteria for the theory and hypotheses.
8.3. Constraints on generality/generalizability and implications for practical use
Articles should also make clear the constraints on generality/generalizability of both their theory (level of universality and degree of precision; e.g., Glöckner, Reference Glöckner2017; Glöckner and Betsch, Reference Glöckner and Betsch2011) and their samples, validity, and methods (e.g., Simons et al., Reference Simons, Shoda and Lindsay2017). Given that the scope of generalization or context limitation of the items has not been clearly defined or established beforehand, this raises the question of falsifiability: How do we establish whether an empirical test of a theory or a phenomenon has been rejected or received empirical support? For falsifiability, there needs to be a clear criterion as to how to test items, and this needs to be defined a priori together with the theory, hypotheses, and empirical tests. We must avoid the unfalsifiable criteria by which evaluating whether items are relevant to the phenomenon is based solely on whether we find support for the phenomenon when testing the phenomenon using these items. If the items are not the criteria, but rather the criteria is the process by which the items are constructed, then both the theory and the empirical investigation demonstrating the phenomenon must be adjusted to include the procedure by which the items are created.
The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) seems to claim that the phenomenon is so contextual that it must always be pretested and adjusted. This unfortunately severely limits the theory’s generalizability and robustness, and therefore its importance. If the existence of the phenomenon always depends on the context and any failure to demonstrate the phenomenon can be put down to changes in context, then the natural question that arises is: Of what academic and practical use is the finding? In some of the commentary’s claims, it appears as though the argument was that this specific empirical demonstration should only be expected to work as if studies are conducted at the same time, on the same sample, in the same context, and that each time we should test whether all stimuli have the same meaning. Yet the stimuli never have the same meaning. Even with the same participants, time passes, and people change and react differently at different times. In scientific follow-up studies, we use different samples and run them in different labs, at different times of the day, in different locations, with different background settings. The target article did not measure or report any of these factors, likely because they did not think that these should matter. If a phenomenon is truly robust and generalizable, to have enough meaning and to be of value and practical importance to the scientific community and stakeholders, then these small details better not matter. The factors that the authors expect to matter should be stated in advance and should be tied to the theory, and the empirical evidence should show that they have addressed those constraints. The argument that any other time, sample, or context requires a reformulation of the theory or empirical demonstration undermines its value. This is not just an empirical issue regarding replications; this is of importance to the broad audiences that rely on our findings in practice. Audiences need to know the scope of the phenomenon and how to adjust for implementation in their own setting.
Our team has shown that many classic judgment and decision-making studies from as early as the 1970s replicate well with original materials, even when these materials are very outdated, and even though much has changed over the past 5 decades. These have withstood the test of time, context, culture, language, and other factors, and it is what makes the decision-making phenomena so important in practice.
9. Conclusion
We responded to criticism by Shafir and Cheek’s (Reference Cheek and Shafir2024) commentary regarding our replication and the value of direct replications. The commentary furthers our understanding of their views on the process required to empirically demonstrate the phenomenon. Yet more details are needed to clarify their theory and the scope and generalizability of the empirical process, to clearly specify how the cutoff thresholds are defined, and to further test the process rigorously for all problems from Shafir (Reference Shafir1993). We addressed inaccuracies in reference to our work and responded in detail to their critiques of our replication and direct replications more broadly, reviewing the importance and value of direct replications, and calling for conducting and incentivizing more direct close replications.
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
You have
Access
Open access
1. Introduction
The Shafir and Cheek (Reference Shafir and Cheek2024) commentary discussed our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) article, which reported an attempted replication of the 8 studies reported by Shafir (Reference Shafir1993). The studies in Shafir (Reference Shafir1993) tested 2 decision frames—choosing versus rejecting—in a variety of contexts, and the findings challenged conventional assumptions by revealing that the 2 decision frames are not always complementary. In our replication report, we concluded a mostly unsuccessful replication, with mixed support for the findings reported in Shafir (Reference Shafir1993), successfully replicating only 2 of the 8 scenarios. Using an extension, based on a suggestion in Shafir’s commentary replying to a failed replication of one scenario from Shafir (Reference Shafir1993) by Many Labs 2 (Klein et al., Reference Klein, Vianello and Hasselman2018), we provided an initial exploratory test of an alternative theoretical account using the same scenarios, and concluded that our data were suggestive of supporting an accentuation theoretical account (Wedell, Reference Wedell1997) rather than the compatibility theoretical account suggested in Shafir (Reference Shafir1993). The Shafir and Cheek (Reference Shafir and Cheek2024) commentary critiqued the definition and the value of direct replications, questioned our classification of the replication as a direct, very close replication, and argued that our process and evidence were an inadequate test of the phenomenon.
Going beyond the discussion about replications, the Shafir and Cheek (Reference Shafir and Cheek2024) commentary also shared a conceptual replication of 1 of the 8 scenarios Shafir (Reference Shafir1993), and we tested a scenario that neither we nor Many Labs 2 (Klein et al., Reference Klein, Vianello and Hasselman2018) found support for. The commentary argued that to truly test the phenomenon, one must ensure that certain theory-driven valence properties are present in the tested context, potentially by using a pilot of the features used in the vignettes. Following this argument, they demonstrated empirically that the original scenarios used in Shafir (Reference Shafir1993) do not align with their expected valence properties, and that with scenario modifications and item pretesting of 1 of the 8 scenarios, they were able to find support for the phenomenon.
We believe that this is an important dialogue and appreciate the opportunity to engage in a discussion regarding our replication attempt, our findings, and direct replications more broadly. We are encouraged by the commentary elaboration on their views regarding theory and generalizability limitations, the sharing of new suggested pretesting procedures, and the empirical demonstration of how the original stimuli can be updated. None of these are taken for granted or trivial, and they highlight a much-needed discussion about theories and empirical testing in judgment and decision-making that go far beyond our specific replication or the broader discussion on direct replications.
In this rejoinder, we clarify important aspects of our replication and process that we believe are relevant as a backdrop to the criticism raised by the commentary. We then address each of the issues raised and provide an in-depth discussion of the value and importance of direct replications and open science. Our summary of the rebuttal of the key points raised in the commentary is summarized in Table 1.
Table 1 Summary and rebuttal of the main arguments made in Shafir and Cheek (Reference Shafir and Cheek2024)
2. Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021): Background
In Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021), we reported a pre-registered replication and extension of a seminal paper by Shafir (Reference Shafir1993) that documented several paradigms showing different behaviors when comparing decisions of ‘choosing’ versus decisions of ‘rejecting’. Briefly, the studies in Shafir (Reference Shafir1993) reported that a choice set with ‘enriched’ options, which had more positive and more negative attributes compared with an ‘impoverished’ option, was more likely to be both chosen and rejected. The suggested explanation for these effects was that of ‘compatibility’, in that choosing leads to an emphasis on strengths, whereas rejecting leads to an emphasis on weaknesses, resulting in the enriched option receiving a higher ratio of choice and rejection.
The Many Labs 2 mass collaboration (Klein et al., Reference Klein, Vianello and Hasselman2018) conducted—among many other replications—an initial partial replication of the work by Shafir (Reference Shafir1993) focusing only on Problem 1, concluding a failure to replicate the effect. In a reply to the effort, the Shafir (Reference Shafir2018) commentary raised several important limitations of that replication, arguing that the replication (1) was not a comprehensive replication of all scenarios, (2) lacked counterbalancing in the presentation of the alternatives, and (3) may have been unsuccessful due to the possibility that the meaning of some of these scenarios has changed over time. The commentary went further to mention Wedell (Reference Wedell1997) as an alternative account with an ‘accentuation’ hypothesis, stating that: ‘The experimental findings suggest that there are at least two distinct influences on simple binary choices of the kind considered here. Compatibility, the effect I attributed my findings to raises the weights of attributes compatible with the task at hand; accentuation, as proposed by Wedell (Reference Wedell1997), leads to greater weighting of attribute differences in choice than in rejection’ (p. 496).
Our replication addressed this exchange and was a step forward in helping the community make progress in understanding the phenomenon. We addressed the first 2 concerns raised by Shafir, as we attempted a replication of all 8 problems reported, and added several improvements, such as the counterbalancing of the display of the options. Furthermore, we added an exploratory extension that allowed testing for the possibility of the accentuation alternative account that Shafir suggested.
3. Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021): Findings
In our replication, we concluded that ‘we found no consistent support for the hypotheses across the eight problems: two had similar effects, two had opposite effects, and four showed no effects’ (underline not in original text). Although we consider the aggregated findings as a failure to replicate the findings of the target article as a whole, we tried to be very careful in how we framed our findings, and we note we deliberately framed those as a failure to find consistent support, rather than a failure to find any support, and failure to find consistent support specifically for the target article’s findings, rather than a failure to find support for findings regarding the phenomenon all together. We also reiterate that our findings were not random noise, nor were they only representing null effects, and our findings were not a complete failure to find any support for the phenomenon. Quite the contrary, we found support for the phenomenon in 2 of the 8 scenarios, and using our added extension, we suggested support for an alternative account to Shafir’s, one that Shafir (Reference Shafir2018) specifically suggested in his commentary reply to Many Labs 2 (Klein et al., Reference Klein, Vianello and Hasselman2018). This means that using the original stimuli from the 1990s, with no additional modifications, we found support for the phenomenon in 2 of the scenarios, and overall concluded support for a pattern of results that was suggested in the literature following Shafir (Wedell, Reference Wedell1997), one which he himself pointed to when writing a commentary to Many Labs 2 (Shafir, Reference Shafir2018).
The commentary noted that we ‘conclude[d] that a decades-old finding “does not replicate”’ (p. 8) and, in their pushback, argued that ‘all that replicators should be free to conclude is that the original materials, years later, or in different contexts, do not produce the same pattern of results, a finding that we find of limited insight by itself’ (p. 8).
In fact, what they suggested we should conclude was exactly what we concluded in our replication. We opened our discussion section with the following: ‘We successfully replicated the results of Problem 4 and Problem 5 of the original study. However, in Problems 7 and 8, we found effects in the direction opposite to the original findings, and our findings for Problems 1, 2, 3, and 6 indicated support for the null hypothesis’. We further wrote that ‘our replication does not rule out the compatibility account, only indicates that it is in need of further elaboration and specification, and further testing, and we see much promise in examining the interaction of the two accounts’. And that ‘we recommend that other compatibility hypothesis stimuli be revisited with direct close replications or that new stimuli be developed before further expanding on the compatibility hypothesis’.
4. Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021): Replication categorization
The commentary criticized our classification of our replication as a ‘very close replication’, arguing that ‘very close replications do not seem, from a theoretical perspective, very close after all’ (p. 8), emphasizing what seems like theoretical closeness over empirical closeness.
On that point, we reiterate what we wrote in our replication and clarify that our categorization used LeBel et al.’s (Reference LeBel, McCarthy, Earp, Elson and Vanpaemel2018) taxonomy. To the best of our knowledge, this is the most common taxonomy of replications currently available, and we have employed it successfully throughout our many published replications. The commentary criticizes several aspects of the ‘very close’ categorization, especially regarding what they refer to as a ‘theoretical perspective’. We feel that this is an important debate to have as a community, and we would welcome a broader debate to improve that taxonomy and further suggestions and examples on how to evaluate and pursue theoretical closeness. We come back to this point when we discuss the value of direct, very close replications.
5. Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021): Process
The commentary criticized the value of direct replications, and so in this section, we aimed to chronologically outline the replications that took place in the process, since the publication of Shafir (Reference Shafir1993), and through that to clarify the value that we see in direct replications and their contributions to the understanding of the focal findings. The main stages in this process are summarized in Table 2.
Table 2 Timeline of scientific process and studies conducted following the publication of Shafir (Reference Shafir1993)
Many Labs 2 conducted the first published replication of the findings by Shafir (Reference Shafir1993). A follow-up commentary by Shafir (Reference Shafir2018) raised several methodological concerns, sharing that they also conducted replications of the findings by Shafir (Reference Shafir1993) and wrote (p. 496):
In follow-up work, my student Nathan Cheek and I have run several studies intended to further clarify these apparently conflicting patterns. In a working paper (Cheek and Shafir, Reference Cheek and Shafir2018), we show that the original pattern is easy to replicate and that the pattern predicted by Wedell and observed in Many Labs 2 is also easy to document, and we further consider the cognitive mechanisms that might account for both.
Our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) replication addressed some of the points raised in that Shafir (1998) commentary by conducting an additional direct replication of all 8 scenarios reported in Shafir (Reference Shafir1993) with the counterbalancing of options.
In the commentary by Shafir and Cheek (Reference Shafir and Cheek2024) on our replication, the authors again shared that they conducted additional unpublished replications (p. 8):
We also ran the original later in 2021 and failed to obtain the 1993 results, as reported in Cheek and Shafir (Reference Cheek and Shafir2024).
The published direct replications by Many Labs 2 and Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) are important because they are the only available public reports of a replicability assessment of the original findings by Shafir (Reference Shafir1993) as is. Those direct replications are also important because they set in motion the publishing of the commentaries by Shafir (Reference Shafir2018) and Shafir and Cheek (Reference Shafir and Cheek2024), which have raised new contestations and understandings that were not fully articulated in Shafir (Reference Shafir1993). Direct replications, therefore, help ensure that science can progress in studying a phenomenon by (1) assessing the replicability of the original findings using very similar conditions and stimuli, (2) eliciting public sharing of implicit knowledge and vital information not clearly communicated in the reporting of the original findings, and (3) motivating further public discussions regarding how to best further study the phenomenon. Without those, the public would only see the original studies by Shafir (Reference Shafir1993), making it unclear whether the empirical findings reported in that article contain all that is needed for others to build on those findings, are replicable as is, and are up to date.
The commentaries by Shafir (Reference Shafir2018) and Shafir and Cheek (Reference Shafir and Cheek2024) also briefly mentioned details and empirical evidence that would have helped progress our understanding of the phenomenon and the needed methods even further: (1) the process and pretests of the original findings from the target article, (2) the findings of the first reported failed direct replication and the procedures and materials of the adjusted scenario(s) replication from their response to the Many Labs 2 replication (Cheek and Shafir, Reference Cheek and Shafir2018), and (3) the failed direct replications in response to our replication (Cheek and Shafir, Reference Cheek and Shafir2024). It is unfortunate that neither of the commentaries further elaborated on their own failed direct replications nor on any of the details regarding the successful adjusted and conceptual replications. These would have been very helpful for the community and for us in our replication, so that we can all examine and learn from what the commentaries’ authors did to make needed adjustments. We consider this a missed opportunity. Without access to further details about these studies, we as a community cannot verify, evaluate, or learn from the experience gained, and thus they remain implicit knowledge by the commentaries’ authors. We kindly ask the commentaries’ authors to follow up and share all the empirical evidence they have conducted regarding this phenomenon. This can be easily done through uploading all materials, data, and code to a publicly open and citable project on the Open Science Framework (osf.io) or Research Box (researchbox.org), and does not require a manuscript and going through a lengthy peer review.
To gain a better understanding of the phenomenon, it is crucial to publicly share all replications, direct and conceptual, successful and failed, by original authors and others in the community, even as preprints or public projects. The community needs to be able to evaluate claimed scientific evidence. For trust in science to be established and warranted, it is essential that scientific reporting is transparent, thereby enhancing the ability to assess the quality of research with greater certainty (Vazire, Reference Vazire2017).
6. Challenges in interpreting direct replication results: Hindsight, outcome, and confirmation biases
The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) argued that replications ‘can be highly misleading’ and that our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) replication of Shafir (Reference Shafir1993) is further ‘exacerbating replication concerns’. Such arguments are often raised when the findings of the replication are not consistent with the findings reported by the original studies, resulting in criticism of direct replications as inherently flawed for not addressing any of the countless possible factors raised post hoc and therefore being of no value. In this section, we discuss the issues with post hoc outcome-based interpretations of direct replications and caution against possible hindsight, outcome, and confirmation biases in critiquing results of direct replications after the fact.
One of the challenges with results-based arguments for problems with direct replications is that these arguments are commonly limited to failures, and yet some direct replications succeed in replicating original findings. Our Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) was part of a mass collaboration effort in which we concluded over 120 replications of classic effects in the judgment and decision-making and social psychology literature (CORE, 2025). As part of this effort, in addition to the replication by Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021), we completed replications of many other classic articles from the same time as the studies reported by Shafir (Reference Shafir1993). For example, in Ziano et al. (Reference Ziano, Li, Tsun, Lei, Kamath, Cheng and Feldman2021), we concluded a successful replication of a classic article by Shafir et al. (Reference Shafir, Diamond and Tversky1997) regarding a phenomenon coined as the ‘money illusion’, the tendency to think about money in nominal rather than real terms. The stimuli from the 1990s were repeated as is in the replication, and included references to amounts of money that changed value over time due to inflation, economic terms that shifted over the 2 decades, and factors such as affect (e.g., happiness) and attitudes (e.g., job satisfaction) that may vary between samples and change over time. Despite the change in time, context, and samples, the results of the replication were very similar to those of the original findings, and out of the 4 problems, we concluded that 3 of the replication effects were consistent with the original findings (e.g., Problem 1; original: Cramer’s V = 0.26, 95% CI [0.17, 0.37]; replication: V = 0.28 [0.21, 0.36]), and one of the replication effects was stronger than the effect reported in the original studies.
The commentary argued that ‘what is clear is that some findings are going to be time-sensitive in ways that optical illusions are not’, yet we argue that it is not at all clear what is time-sensitive, and many of the phenomena that we attempted to replicate with the CORE (2025) team showed remarkable consistency over time. To establish what is and what is not time-specific, we need to regularly run replications and specifically direct replications.
Furthermore, some phenomena may replicate well across contexts and cultures, and it is not clear if the context matters until we test it in that context. For example, a Brazilian team has followed up some of our CORE (2025) team replications, reusing our materials, translating those to Portuguese, and running those with Brazilian samples. One of these replications is de Moraes Ferreira et al. (Reference de Moraes Ferreira, Santiago, Seda, Batistuzzo, Bastos, Borborema and Fatori2023), which repeated our Ziano et al. (Reference Ziano, Li, Tsun, Lei, Kamath, Cheng and Feldman2021) replication of Shafir et al. (Reference Shafir, Diamond and Tversky1997). They, too, concluded remarkably similar results to our successful replication. Before seeing the results, scholars could have argued either way, with both reasons why this would replicate well and reasons why this is doomed to fail. The best way to establish whether the results hold in a different country using a different language is to first repeat it with direct close replications only varying the language and sample.
These successful replications of Shafir et al. (Reference Shafir, Diamond and Tversky1997) are no coincidence. In the CORE (2025) team, we conducted many replications of classics dating back to the 1970s, and using different samples and contexts, our replication success rate has been relatively high (above 60%). In almost all of those replications, we reran the original stimuli and items with minimal to no adjustments. This goes to show that some of the JDM classics hold across time, context, and cultures, decades later.
We, therefore, need to be very careful with the criticism of direct replications only when results are negative and after the fact. Evaluating scientific outputs differently based on outcomes relates to the challenges of hindsight, outcome, and confirmation biases in the scientific process. For example, the publication of a successful replication is far less likely to result in further replications, conceptual adjustments, and public commentaries. If a replication’s findings are not fully consistent with the original findings, then it tends to elicit stronger negative evaluations of the replication, or of the replicators and/or their motivations. This is despite replications often meeting much higher standards than those by the target articles in that they are often pre-registered, much better powered with larger, more diverse samples, fully transparent in all their materials, data, and code, and adding extensions that help better understand the effect or clarify the effect in case of a failure.
Are the studies showing hindsight, outcome, and confirmation biases replicable, hold across time and context, and impact evaluations of replicability? Our evidence from the CORE (2025) team suggests that the answer to all of those questions is ‘yes’. Three of the target articles that we successfully replicated from the 1970s and the 1980s using very similar items with little to no adjustments were about these 3 biases. In Aiyer et al. (Reference Aiyer, Kam, Ng, Young, Shi and Feldman2023), we successfully replicated outcome bias demonstrated by Baron and Hershey (Reference Baron and Hershey1988) showing that a decision resulting in a positive outcome was evaluated as better, more important, and more normative than the same decision resulting in a negative outcome, even when participants were explicitly told to ignore the outcome and have themselves indicated to have ignored the outcome. In Chen et al. (Reference Chen, Kwan, Ma, Choi, Lo, Au and Feldman2021), we successfully replicated retrospective and prospective hindsight bias from Fischhoff (Reference Fischhoff1975) and Slovic and Fischhoff (Reference Slovic and Fischhoff1977). In our third study in Chen et al. (Reference Chen, Kwan, Ma, Choi, Lo, Au and Feldman2021), we showed hindsight and outcome bias regarding the replicability of hindsight bias. That is, we asked participants to predict the likelihood that a seminal study on hindsight bias (Fischhoff, Reference Fischhoff1975) would successfully replicate, in 3 conditions. In the ‘foresight’ condition, there was no indication of the outcome of our replication; in the ‘hindsight positive’ condition, we indicated that the replication outcome was successful and in support of the original findings; and in the ‘hindsight negative’ condition, we indicated that the replication outcome was negative and failed to find support for the original findings. In both hindsight conditions, participants were instructed to ignore the outcomes: ‘Answer as if you do not know the outcome, estimating the probabilities at that time before the replication study was launched’. We found that when estimating the likelihood of a successful replication of hindsight bias, participants in the hindsight positive condition rated the likelihood as higher than those in the foresight condition, who in turn rated the likelihood as higher than those in the hindsight negative condition.
Seeing the results of a replication triggers outcome bias and hindsight bias—it is unavoidable, even for those who consider themselves unbiased, and even when explicitly told to ignore the outcomes. For those who are invested in a certain outcome, an outcome different from expectations may trigger confirmation bias, in the rejection of conflicting evidence and in seeking other evidence that would confirm held beliefs.
Replications are especially tricky. When replications succeed, a common reaction is along the lines of: ‘Of course it would replicate, we knew it would all along, replicators conducted the replication well, but it is of no value, because we had the original findings.’ When replications fail, a common reaction is along the lines of: ‘of course it would fail, we knew it all along’ either questioning the competency of the replicators, the quality of their replication decisions, and/or raising post-hoc reasons for factors that may have led to the failure. This is not to say that there is no merit in the suggested factors, or that failures are not associated with issues regarding replicators and the replication process. The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) argued that their new evidence using a new pretesting procedure not documented in Shafir (Reference Shafir1993) demonstrated on only 1 of 8 scenarios from Shafir (Reference Shafir1993) shows that the evidence by Chandrashekar et al. (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) with comprehensive replications of all 8 scenarios using the same terms as in Shafir (Reference Shafir1993) is problematic and is of no value—‘a finding that we find of limited insight by itself’ (p. 8).
One of the key questions in assessing the methods of a replication is whether an expert examining the methods of the original studies against those of the replication, without seeing the replication outcomes, could have predicted the replication outcome and would have identified any critical flaws. Given that we followed the article by Shafir (Reference Shafir1993) closely, that the article did not specify any generalizability criteria, context limitations, or pretests referenced in the commentary by Shafir and Cheek (Reference Shafir and Cheek2024), and that there were no publicly shared additional updates to the original findings, we thought one would expect the original findings to replicate successfully. Even if not, the community should welcome additional evidence, and indeed a second commentary on our replication by Ganzach (Reference Ganzach2025) concluded that ‘I view Chandrashekar et al.’s (Reference Chandrashekar, Weber, Chan, Cho, Chu, Cheng and Feldman2021) replication as a worthwhile contribution to our understanding of this effect’ (p. 3). It is unclear how replicators and researchers building on the work of Shafir (Reference Shafir1993) were expected to guess procedures needed for the effect to emerge, and it is only thanks to the publication of the findings in the direct replications and the follow-up commentaries that we can now publicly discuss more appropriate methods that address missing information, unclear theory, or implicit assumptions in the original studies. It is unclear how the community or public are expected to know that the original findings do not replicate as is if there are no public updates to the original findings.
Are there any ways to address hindsight, outcome, and confirmation biases? Yes—Registered Reports and masked-outcome peer review are 2 simple procedures that can at least partly address these biases. In the last 3 years, we have increasingly shifted our replications to Registered Reports, mostly conducting our Registered Reports through the revolutionary Peer Community in Registered Reports initiative (Feldman, Reference Feldman2024; Lloyd and Chambers, Reference Lloyd and Chambers2024), which has an open peer-review process. In our experience, the Registered Reports process has greatly reduced these biases and post hoc outcome-based criticism. When everyone agrees on the methods before data collection, and publication is guaranteed regardless of outcomes, then there is less room for these biases to impact the peer-review process and influence outcomes.
Ideally, replications would be done as Registered Reports (Chambers and Tzavella, Reference Chambers and Tzavella2022; Nosek and Lakens, Reference Nosek and Lakens2014; Soderberg et al., Reference Soderberg, Errington, Schiavone, Bottesini, Thorn, Vazire and Nosek2021), yet when this is not the case, such as when data and results already exist, another possible solution to address potential bias is to mask the editor and reviewers from the outcome, a process implemented by some journals like the Royal Society of Open Science (‘results-blind track’; Chambers and Tzavella, Reference Chambers and Tzavella2022; Woznyj et al., Reference Woznyj, Grenier, Ross, Banks and Rogelberg2018).
Shafir and Cheek’s commentary further reflected on direct close replications using the original items as being ‘problematic’ and ‘misleading’. We wholeheartedly disagree. Direct close replications are highly informative and greatly contribute to scientific progress and to the credibility of the scientific record. Replications have helped the original authors themselves revisit and reassess their own research, to share more from their previously unknown process of evaluating and choosing items, and now with new evidence using new items that demonstrate the phenomenon. Because of the new details we now have about the process, the public debate, and the evidence shared, the academic community and the public are all better off. Scholars that aim to build on the foundations of the choosing versus rejecting paradigms now have a better understanding of how to pursue such research, what works, and what does not, so that they do not invest more time and resources pursuing something using the wrong method or outdated items, and with new insights regarding the possibility of the 2 accounts discussed in the literature. This would not have come to light if it were not for the Many Labs 2 and our replications. Direct replications should be encouraged (Nosek et al., Reference Nosek, Hardwicke, Moshontz, Allard, Corker, Dreber and Vazire2022) and should become mainstream and common (Zwaan et al., Reference Zwaan, Etz, Lucas and Donnellan2018).
7. Replicators working with original authors and adversarial collaborations
The Shafir and Cheek (Reference Shafir and Cheek2024) commentary argued that it would be preferable for replicators to work in collaboration with original authors:
At a minimum, stimuli need to be revisited, in many circumstances preferably in collaboration with the original authors, to ensure that they afford a valid test of the original hypothesis (see also Fiedler et al., Reference Fiedler, McCaughey and Prager2021 on manipulation checks). (p. 8)
We disagree. First, there is no evidence that involving original authors helps improve replications or the probability of a successful replication. If anything, the evidence we have so far from mass collaborations shows no benefits of involving original authors. There are many empirical demonstrations, of which we will mention those we consider to be the most impactful. Many Labs 5 (Ebersole et al., Reference Ebersole, Mathur, Baranski, Bart-Plange, Buttrick, Chartier and Nosek2020) worked together with original authors to revisit 10 of the Reproducibility Project: Psychology (RP:P; Open Science Collaboration, 2015) over which original authors had expressed concerns regarding the replication designs before data collection. After working with the original authors, updating the protocols, and rerunning the studies, they concluded that ‘we found that the revised protocols produced effect sizes similar to those of the RP:P protocols (Δr = .002 or .014, depending on analytic approach)’. In McCarthy et al. (Reference McCarthy, Gervais, Aczel, Al-Kire, Aveyard, Marcella Baraldo and Zogmaister2021), many labs conducted replications of Srull and Wyer’s (Reference Srull and Wyer1979) hostile priming effect, for the second time (the first failed mass-lab replication attempt was McCarthy et al., Reference McCarthy, Skowronski, Verschuere, Meijer, Jim, Hoogesteyn, Orthey, Acar, Aczel, Bakos, Barbosa, Baskin, Bègue, Ben-Shakhar, Birt, Blatz, Charman, Claesen, Clay and Yıldız2018), this time conducting both direct replications and conceptual replications involving the original authors. They concluded that ‘the hostile priming effect for both the close replication (d = 0.09, 95% CI [−0.04, 0.22], z = 1.34, p = .16) and the conceptual replication with the involvement of the original authors (d = 0.05, 95% CI [−0.04, 0.15], z = 1.15, p = .58) were not significantly different from zero’ and that ‘we suggest that researchers should not invest more resources into trying to detect a hostile priming effect using methods like those described in Srull and Wyer (Reference Srull and Wyer1979)’. One of the original authors was involved in the entire process. Lastly, in one of social psychology’s most remarkable replication stories, following a mass replication effort by ego-depletion scholars that failed to find support for ego depletion (Hagger et al., Reference Hagger, Chatzisarantis, Alberts, Anggono, Batailler, Birt and Zwienenberg2016), original authors pushed back on both the choice of study and methods of the mass replications (Baumeister and Vohs, Reference Baumeister and Vohs2016), and proceeded to conduct their own mass replication attempt on a study of their choice only to conclude similar very weak to no effects (Vohs et al., Reference Vohs, Schmeichel, Lohmann, Gronau, Finley, Ainsworth and Albarracin2021).
Furthermore, the involvement of original authors in replications is sometimes (1) impossible, such as when authors have passed away, (2) unreasonable, such as when authors have left academia or retired, or (3) potentially extremely time-consuming or demanding, especially with highly impactful findings that elicit a lot of academic and public interest. With replications of old classics from decades ago, it is also sometimes the case that original authors do not have access to or remember much information regarding their published article or what took place, if it was not well-documented or kept.
Across our many replications, our experience in working with original authors has been very mixed. Some authors are a pleasure to engage and work with—they share everything they have, and provide support with constructive and objective feedback and suggestions. With others, there were issues that ranged from lack of responsiveness, hostility and/or long delays in replies, suspicion over motivations, deference to their authority and status, expectations of blind adherence to instructions given perceived expertise, and unreasonable to impossible requests and/or requirements.
For science, the best path forward is to ensure that anyone can conduct replications without the original authors. Original authors should publicly share as much as possible about their work to make replications possible and easy. As a community, we should encourage and potentially incentivize conducting and publishing external independent direct replications of published work. In Feldman (Reference Feldman2022), we called on researchers to adopt a ‘Check me, replicate me’ pledge inviting others to check and replicate their work, with incentives for finding mistakes. For anyone to spend their scarce time and resources to revisit and follow up on others’ work should be considered a valuable and important scientific pursuit. Original authors should consider replications as an opportunity for self-reflection—whether in improving the clarity, specificity, and falsifiability of their theories; enhancing the transparency of their methods and stimuli; or revisiting and possibly updating their own studies that would demonstrate stronger support for theories and evidence.
8. Pretesting items: Discussing Shafir and Cheek’s empirical demonstration
The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) included an empirical demonstration in which they reported a process of pretesting items in pilots that eventually led to what was concluded as a successful conceptual replication of 1 out of 8 scenarios from Shafir (Reference Shafir1993). We are glad that our replication resulted in further empirical work that has the potential to improve theoretical clarity, methods, measurement, and generalizability. These procedures were not previously shared or explained in Shafir (Reference Shafir1993) and—to the best of our knowledge—were not documented in any of the follow-up literature on this phenomenon; therefore, these are new procedures that serve as a good first step. Yet, to allow the community to learn from and build on that evidence, there are several gaps.
We outline remaining gaps regarding the evidence that was shared: (1) the demonstration was only conducted for 1 out of 8 scenarios, (2) it is unclear how the cutoff thresholds were determined, (3) it is unclear whether the measured valence in the commentary is different from the valence of the items in Shafir (Reference Shafir1993), given that Shafir (Reference Shafir1993) and the commentary did not provide the valence measurements for the items used in Shafir (Reference Shafir1993), and (4) the process of choosing the items and the used cutoff threshold were not pre-registered, and so it is not clear whether these were determine a priori or post hoc, and whether and how these should generalize to other scenarios. Below, we elaborate on each of those gaps in detail.
8.1. Empirical evidence: More information required
The Shafir and Cheek (Reference Shafir and Cheek2024) added pretesting of the valence for the attributes of 1 of 8 problems in Shafir (Reference Shafir1993), noting that:
Pilot testing when the Problem was first run had found that Parent A’s attributes were perceived as neutral, essentially offering no compelling reason to award or deny custody, whereas Parent B’s attributes were compatible with both choice and rejection. (p. 3)
The commentary then reported the findings of 2 pilot surveys that measured the valence of attributes used in the original scenario, as well as additional attributes, concluding that:
We found that the valence of some of the original attributes had changed. (p. 4)
Changed how and from what? It is unclear what the Shafir and Cheek (Reference Shafir and Cheek2024) evidence is indicative of having changed from, given that Shafir (Reference Shafir1993) did not report measuring any of those aspects, and so we have no way of comparing the two. The Shafir (1998) commentary on Many Labs 2 suggested the possibility that a similar procedure may have taken place in the studies reported in Shafir (Reference Shafir1993). The Shafir (1998) commentary simply read (p. 496):
When I devised the binary problems for my 1993 paper, I created enriched options that were preferred in choice, and then added negative attributes so that those options would also be rejected. This was a reasonable strategy to show compatibility, but it happened not to yield enriched options that were unpopular in choice, like those later created by Wedell, where a greater share of choice plus rejection can be obtained by the impoverished option.
Yet we have no access to the mentioned process or data, with the only mention of pretesting and manipulation checks in Shafir (Reference Shafir1993) was that (p. 549):
By way of manipulation checks, for each of the problems that follow, at least 85% of an independent group of subjects (N = 26) chose the enriched option as the option that has more reasons for and against it than the competing, impoverished option (p < .001 in all cases).
To evaluate the evidence and the claimed change in valence from 1993, it is essential that the data from Shafir (Reference Shafir1993) and the procedure behind it are shared, and not just for the 1 scenario (out of 8) that they tried to replicate in the Shafir and Cheek (Reference Shafir and Cheek2024) commentary. Without that data, what the Shafir and Cheek (Reference Shafir and Cheek2024) commentary showed was only that the evaluations at the time they reran these studies in 2022–23 were not aligned with their unspecified valence expectations.
8.2. The need for fully specified, clearly testable, and falsifiable methods
Shafir and Cheek (Reference Shafir and Cheek2024)’s commentary argued that direct replications are of limited value because the original items should not have been used as is, and that for evidence supporting the phenomenon to be found, scholars need to follow a procedure of pretesting the valence of items and selecting specific items that meet unspecified criteria.
We find this argument puzzling, given that both commentaries by Shafir (Reference Shafir2018) and Shafir and Cheek (Reference Shafir and Cheek2024) reported to have, at least twice, ran replications using the original items without going through any updating pretesting procedures. If the pretesting is taken for granted and there is no value in conducting direct replications, then why invest resources in conducting those? It is also unclear whether this procedure was part of the original studies in Shafir (Reference Shafir1993) and if so—what exactly took place. It is a missed opportunity that both follow-up commentaries did not aim to fill that gap by sharing everything. Therefore, we call on the commentary’s authors to further clarify and better specify under what circumstances they consider pretesting a crucial test of the theory and related phenomenon, and to share all that they have that is relevant for that process from their empirical investigations.
The commentary seemed to argue that the value of the direct replications is limited because the replications did not use a piloting procedure, yet given that the suggested pretesting procedure is new, we are unsure how anyone was expected to follow it. Even with the provided evidence, given that it is not fully tested and underspecified, we are still unsure how anyone is expected to implement it for other empirical demonstrations. Replicators could not be expected to guess what needs to be done in order to test and demonstrate a phenomenon, or to guess the limitations on the generalizability of the stimuli. Our view is that, in science, everything should be clearly specified and should not involve unspecified procedures and assumptions, or require implicit knowledge. We are therefore grateful that, at least for one of the scenarios, the pretesting of the factors in the scenarios is a bit clearer. In future studies, we recommend making all procedures transparent and clear, sharing all that has taken place to result in the reported findings, clearly stating the procedures needed to conduct the investigation again in a different context and time, and setting a priori falsifiable criteria for the theory and hypotheses.
8.3. Constraints on generality/generalizability and implications for practical use
Articles should also make clear the constraints on generality/generalizability of both their theory (level of universality and degree of precision; e.g., Glöckner, Reference Glöckner2017; Glöckner and Betsch, Reference Glöckner and Betsch2011) and their samples, validity, and methods (e.g., Simons et al., Reference Simons, Shoda and Lindsay2017). Given that the scope of generalization or context limitation of the items has not been clearly defined or established beforehand, this raises the question of falsifiability: How do we establish whether an empirical test of a theory or a phenomenon has been rejected or received empirical support? For falsifiability, there needs to be a clear criterion as to how to test items, and this needs to be defined a priori together with the theory, hypotheses, and empirical tests. We must avoid the unfalsifiable criteria by which evaluating whether items are relevant to the phenomenon is based solely on whether we find support for the phenomenon when testing the phenomenon using these items. If the items are not the criteria, but rather the criteria is the process by which the items are constructed, then both the theory and the empirical investigation demonstrating the phenomenon must be adjusted to include the procedure by which the items are created.
The commentary by Shafir and Cheek (Reference Shafir and Cheek2024) seems to claim that the phenomenon is so contextual that it must always be pretested and adjusted. This unfortunately severely limits the theory’s generalizability and robustness, and therefore its importance. If the existence of the phenomenon always depends on the context and any failure to demonstrate the phenomenon can be put down to changes in context, then the natural question that arises is: Of what academic and practical use is the finding? In some of the commentary’s claims, it appears as though the argument was that this specific empirical demonstration should only be expected to work as if studies are conducted at the same time, on the same sample, in the same context, and that each time we should test whether all stimuli have the same meaning. Yet the stimuli never have the same meaning. Even with the same participants, time passes, and people change and react differently at different times. In scientific follow-up studies, we use different samples and run them in different labs, at different times of the day, in different locations, with different background settings. The target article did not measure or report any of these factors, likely because they did not think that these should matter. If a phenomenon is truly robust and generalizable, to have enough meaning and to be of value and practical importance to the scientific community and stakeholders, then these small details better not matter. The factors that the authors expect to matter should be stated in advance and should be tied to the theory, and the empirical evidence should show that they have addressed those constraints. The argument that any other time, sample, or context requires a reformulation of the theory or empirical demonstration undermines its value. This is not just an empirical issue regarding replications; this is of importance to the broad audiences that rely on our findings in practice. Audiences need to know the scope of the phenomenon and how to adjust for implementation in their own setting.
Our team has shown that many classic judgment and decision-making studies from as early as the 1970s replicate well with original materials, even when these materials are very outdated, and even though much has changed over the past 5 decades. These have withstood the test of time, context, culture, language, and other factors, and it is what makes the decision-making phenomena so important in practice.
9. Conclusion
We responded to criticism by Shafir and Cheek’s (Reference Cheek and Shafir2024) commentary regarding our replication and the value of direct replications. The commentary furthers our understanding of their views on the process required to empirically demonstrate the phenomenon. Yet more details are needed to clarify their theory and the scope and generalizability of the empirical process, to clearly specify how the cutoff thresholds are defined, and to further test the process rigorously for all problems from Shafir (Reference Shafir1993). We addressed inaccuracies in reference to our work and responded in detail to their critiques of our replication and direct replications more broadly, reviewing the importance and value of direct replications, and calling for conducting and incentivizing more direct close replications.
Author biographies
S.P.C. is a postdoctoral researcher in the Department of Psychology at the Norwegian University of Science and Technology (NTNU). His research focuses on moral psychology, lay beliefs, and judgment and decision-making.
G.F. is an assistant professor in the Department of Psychology at the University of Hong Kong. His research focuses on judgment and decision-making.
Author contributions
Conceptualization, project administration, validation, writing—original draft, and writing—review and editing: S.P.C. and G.F. S.P.C. wrote the initial draft; G.F. revised and edited it. S.P.C. and G.F. finalized the manuscript for journal submission, with final edits by G.F.
Funding statement
The authors received no financial support for the research and/or authorship of this article.
Competing interests
We are the authors of the target article for the commentary. Other than that, we declare no potential competing interests with respect to the authorship and/or publication of this article.