While most programmes in neuroscience are understandably built around imparting foundational knowledge of cell biology, neurons, networks and physiology, there is less attention paid to critical perspectives on methods. This book addresses this gap by covering a broad array of topics, including the philosophy of science, challenges of terminology and language, reductionism and social aspects of science, to challenge claims to explanation and understanding in neuroscience. Using examples from dominant areas of neuroscience research alongside novel material from systems that are less often presented, it promotes the general need of scientists (and non-scientists) to think critically. Chapters also explore translations between neuroscience and technology, artificial intelligence, education and criminology. Featuring accessible material alongside further resources for deeper study, this work serves as an essential resource for undergraduate and graduate courses in psychology, neuroscience and biological sciences, while also supporting researchers in exploring philosophical and methodological challenges in contemporary research.

This chapter considers neuroscience translations and attempts to apply our knowledge of the nervous system in practical approaches. I start by discussing the traditional areas of translation, neurology and psychiatry, and the extent to which a focus on neurobiological aspects can help in addressing these conditions. I then turn to more recent claims that neuroscience can inform educational practice, including claims of pharmacological cognitive enhancement, and neurocriminology claims that we will be able to predict and prevent criminal behaviour by identifying the neural mechanisms involved. The discussion covers brain imaging and heritability approaches that try to identify biological bases that can be targeted in translations and interventions, highlighting the caveats associated with these approaches and the claims made from them.

This chapter considers new tools introduced in neuroscience over the past thirty years and claims that these tools will overcome traditional limitations. Some claim that tools lead scientific advances; I question this claim, not by negating the utility of new tools, but highlighting that they have to be applied to relevant concepts. Tool development has been and maintains a major aspect of neuroscience, with the US BRAIN initiative investing over a billion dollars by the end of the decade to develop new tools. I cover computer modelling, molecular genetics, connectomics, calcium and voltage imaging, optogentics and neural pixel probes. I highlight the advantages of each approach, but then discuss various caveats that should be highlighted to promote attempts to address them and improve the insight that the techniques can give.

This brief chapter considers what we mean by knowledge, explanation and understanding, aspects that have and remain areas of debate in the philosophy of science. Despite scientists referring to these aspects routinely in ways that suggest their meaning is clear, examples are given that suggest the terms can actually be used in various ways by different people. It is important to consider what is being claimed and why in a claimed explanation or a claim to understanding, because the terms carry different weights and subjectively mean different things. This can lead to confusion and errors of reasoning that can constrain a field.

This chapter looks at claims to understanding. It begins by looking at the system I have worked on, the lamprey spinal cord locomotor circuit, and claims that circuit function and behaviour can be understood in terms of the interactions of spinal cord nerve cells. I highlight that the claims to experimental confirmation actually reflect various assumptions and extrapolations and that the claimed understanding is lacking. I then look at the Nobel Prize winning work on the Aplysia gill withdrawal reflex, making the same conclusion as the lamprey, various assumptions and extrapolations are used to claim causal links, and in doing this commit various logical fallacies, including confusing correlation for causation and begging the question. I finish by looking at hippocampal long-term potentiation and claims it is the cellular basis of memory, again highlighting that the claimed links have not been made.

This introductory chapter starts by considering the distinction between doubt and denial, and why retaining doubt in science is needed to ensure claims are accurate. It then discusses neuroscience aims and claims, and how the insight obtained is directed at translations to practical use in artificial intelligence, neurology, psychiatry and wider translations to society; for example, education and cognitive enhancement. The chapter highlights the relevance of philosophy and history to science, aspects to which science students are seldom exposed. This includes discussion of science denial by popularist politicians and corporations who try and ignore or dismiss evidence that negates their views or products. These aspects are highlighted as being important to defend science and ensure that scientific claims are as accurate as possible, and that in an age of disinformation we all need to think critically, mirroring the workers’ educational movements of the late nineteenth century.

This chapter looks specifically at neural circuits, assemblies of neurons that influence sensory, motor and cognitive functions. I discuss the conventional criteria for understanding these circuits, which are reductionist in their approach, and highlight various caveats in experimental and conceptual approaches that are routinely followed. I also consider the use of motifs, arrangements of component parts of a circuit that serve specific functions like electronic components. I follow others in highlighting the utility of appealing to motifs, but again highlight caveats of these motifs that mean we cannot assume their presence or the function when we know they are present. I finish by discussing aspects that have been identified over the last few decades that may add to the aspects we need to study, including plasticity, glial cells, variability and ephaptic signals.

This chapter considers reductionism, a major aspect of neuroscience research. I consider reductionist claims that we can only understand nervous systems from knowledge of their component parts. I then consider reductionist approaches and what we have learnt by following them, highlighting that a complete reductionist account of any nervous system region hasn’t been and is probably impossible to achieve. I then discuss decomposable hierarchical and non-decomposable heterarchical systems, and how relational aspects suggest we cannot understand the latter systems from cataloguing their individual components. I then discuss two effects that have received little attention despite being known for decades – volume transmission and ephaptic signalling – that highlight the need to consider component parts in relation to the whole system. I finish by discussing non-reductionist views, equipotentiality, cybernetics, the holonomic brain and embodied cognition, highlighting, as many have in the past, that debating between reductionist and non-reductionist approaches is a false dichotomy.

This chapter looks at social influences on neuroscience. It outlines that science is a social system, and subject to various social pressures that can affect what we study, how we study it, and how we interpret the data we obtain. This includes financial conflicts of interest, claims to priority, scientific prizes, peer review, ‘scientmanship’ that attempts to promote or suppress certain scientific views and scientists, and the recent quantification of social pressures in science from surveys that suggest that social pressures and career structures introduce behaviours that make science a difficult career for those lower in the scientific hierarchy, including racial and sexual biases, and can see those higher up using their prominence to affect how science is done and the claims made. I highlight that awareness of these negative social influences is starting to lead to approaches that aim to address these issues.