Pigs (Sus scrofa domesticus) and most other farmed species are social animals for whom social isolation is known to cause stress. However, their social nature is commonly ignored in behavioural and cognitive tasks, on which they are trained and tested individually, which may impact their welfare and the validity of test results. We chose the Judgement Bias Task (JBT), a promising proxy measure of affective states, to compare training duration, task performance and behaviour of pigs trained and tested in social isolation (ISO; n = 12) with pigs trained and tested with physical and visual contact to social companions through an opening covered with wire mesh (SOC; n = 12). Eleven SOC pigs and eight ISO pigs learned the task, but SOC and ISO pigs did not differ in training duration or task performance when tested. However, ISO pigs showed a higher frequency of all behavioural measures indicative of stress, i.e. high-pitched vocalisation, freezing, exit-approaching behaviour, heavy escape attempts, defaecation and urination compared to SOC pigs. Future research should replicate our study, additionally in combination with other treatments like different housing conditions, to investigate potential interacting effects on learning and task performance. Several open questions remain, but the unambiguous behavioural differences we found strongly advocate for more research to decrease the stress and thus improve the welfare of pigs and other social animals used in behavioural and cognitive tasks.

Affective ties encompass a broad family of emotional phenomena, including love, affection, attachment, and devotion. Affective ties may appear deeply personal, and they most certainly are. But they are also important resources for the exercise of political power in international politics – not only as vulnerabilities that can be exploited for coercion but also, and more significantly, as means to mobilise action and sacrifice. Viewed from the vantage point of political agents, affective ties are thus power resources whose distribution in the international system shapes their strategies and choices. Viewed from the perspective of the system, the international realm is not only characterised by struggles over material capabilities or ideas but also competition over affective ties. Correspondingly, nationalism is not simply an identity. It is a collection of techniques and practices for generating and capturing affective ties that has emerged as a highly effective contender in this contest, with crucial implications for how the international system is organised. That being said, other forms of eliciting affective ties also persist.

Individuals on the autism spectrum or with elevated autistic traits have shown difficulty in recognizing people’s facial emotions. They also tend to gravitate toward anime, a highly visual medium featuring animated characters whose facial emotions may be easier to distinguish. Because autistic traits overlap with alexithymia, or difficulty in identifying and describing feelings, alexithymia might explain the association between elevated autistic traits and difficulty with facial emotion recognition. The present study used a computerized task to first examine whether elevated autistic traits in a community sample of 247 adults were associated with less accurate emotion recognition of human but not anime faces. Results showed that individuals higher in autistic traits performed significantly worse on the human facial emotion recognition task, but no better or worse on the anime version. After controlling for alexithymia and other potentially confounding variables, autistic traits were no longer associated with performance on the facial emotion recognition tasks. However, alexithymia remained a significant predictor and fully mediated the relationship between autistic traits and emotion recognition of both human and anime faces. Findings suggest that interventions designed to help individuals on the autism spectrum with facial emotion recognition might benefit from targeting alexithymia and employing anime characters.

Past experimental research has shown that when rating systems are available, buyers are more generous in accepting unfair offers in ultimatum bargaining. However, it also suggests that, under these conditions, sellers behave more fairly to avoid receiving negative feedback. This paper experimentally investigates which effect is stronger with the use of a rating system: buyers’ inflated inequity acceptance or sellers’ disapproval aversion. We explore this question by varying the information condition on the buyers’ side. Our experiment shows that in a setup where the size of the pie is common knowledge for both buyers and sellers, when a rating system is present, the sellers exhibit disapproval aversion but the buyers do not display greater acceptance of inequity. By contrast, when only sellers are aware of the size of the pie, sellers behave aggressively to exploit buyers and their behavior does not change in the presence of a rating system; however, buyers display greater acceptance of inequity when a rating system is present. We discuss how these results can be explained by a theoretical model that includes sellers’ social disapproval aversion and buyers’ disappointment aversion in addition to the players’ inequality aversion.

This article interrogates the ways in which two political books written by elites in the Constitutional Democratic Party of Japan (CDP) take different tacks to represent their party as trustworthy, responsible, and competent against the background of the liberal opposition's political difficulties since 2012. Focusing on two books published in the lead-up to the 2021 general election by former Prime Minister Kan Naoto and then-leader of the CDP Edano Yukio, it argues that the liberal opposition parties in Japan are, on top of the more commonly understood institutional pressures, constrained by demands that the narrative is a conventionally satisfying one when crafting claims about their viability as an alternative to government.

This introduction to the special issue on food charity, religion, and care in Vietnam compares grassroots philanthropy in Vietnam with broader trends toward religious humanitarianism happening across Asia. The co-editors of the special issue examine why food charity has become popular in urban areas like Ho Chi Minh City by exploring how food holds spiritual, moral significance for both donors and recipients. This survey illuminates how grassroots philanthropy in Vietnam can offer a comparative study for spirituality, ethics, and food practices across Asia, as well as religious humanitarianism globally.

We examine elicitation effects in a multi-stage bargaining experiment with escalating stakes conducted under direct-response and strategy-method elicitation. We find a significantly greater incidence of decisions leading to bargaining failure under direct responses. In addition, the predictive power of alternative risk attitude measures differs between the elicitation methods. Potential sources of the effects and resulting implications are discussed.

Although psychopathic personality traits are widely reported to be related to reduced reactivity to emotion-eliciting situations, findings are not consistent. It has been argued that these differences could be related to variations in the way psychopathy is measured. To examine whether measurement variance resulting from the use of clinical assessment versus self-report assessment could be driving such differences, this systematic review and meta-analysis investigated the comparability of relations between psychopathic traits and responsiveness to emotion-inducing tasks for clinical versus self-report measures. The systematic review resulted in eight studies and 131 effect sizes, which included studies of emotion categorization, emotion regulation, decision-making, and executive functioning tasks. Robust Variance Estimation correlated effects models revealed no significant differences between effect sizes for clinical (PCL-R) versus self-report (PPI, SRP, and LSRP) assessment-based psychopathic traits and emotion tasks. Despite the small number of studies that included both clinical and self-report assessments of psychopathy, these results do not provide any evidence for an assessment-based difference in correlations with emotional responsiveness across tasks. The findings also show no associations between scores on emotional responsiveness and indices of psychopathy. Future research on emotional responsiveness in psychopathy should include both assessment types to be able to increase the research basis for the comparison.

While our earlier report focused on the initial four months of the dataset (Saito et al., 2018, Language Learning), this study investigates the relationship between individual differences in motivation (Ideal Self and Ought–to Self), emotions (Enjoyment and Anxiety), and L2 speech learning among 121 Japanese English–as–a–Foreign–Language high school students over 1.5–years. Participants’ L2 speech proficiency consistently improved at each testing point (6 months, 10 months, and 1.5 years), while their motivation and emotions, measured through questionnaires, remained relatively stable. The results of structural equation modeling suggest that the relationship between motivation, emotions, and acquisition may evolve. Within the first 6-10 months, data indicated a correlational relationship, highlighting a mutual influence among motivation, emotions, and acquisition. However, as the study progressed beyond one year, after students had fully adapted to their educational settings, a clearer causal relationship emerged: Enhanced motivation and more positive emotions were linked to increased classroom practice, leading to significant gains in L2 speech proficiency. The predictive roles of Anxiety remained unclear in this longitudinal dataset.