Thomas Nadelhoffer

This chapter describes interdisciplinary research on measuring beliefs about free will and on attempts to alter those beliefs and associated behaviors. The authors developed a new psychometric instrument for _measuring_ people’s beliefs specifically about free will, determinism, and dualism. They generated new primes to _manipulate_ people’s beliefs about free will and tested the relationship between beliefs about free will and various moral and nonmoral behaviors, including cheating, helping, thought suppression, creativity, and persistence in difficult tasks. The chapter describes the assorted results obtained and the lessons learned in the process.

Philosophers have long speculated that individual differences in temperament influence philosophical thinking, yet empirical research has rarely explored the role of neurodivergent traits in this domain. In this large online study (N = 1,254), we investigated whether participants with training in philosophy differ from the general population when it comes to six psychological traits – autism, ADHD, aphantasia, anendophasia, anauralia, and representational manipulation – and also whether these traits correlate with responses to two widely studied philosophical thought experiments: the “trolley problem” and the “rollback deterministic universe.” Compared to the general population, participants with training in philosophy had higher scores on measures of ADHD, internal verbalization, and representational manipulation, but lower scores on measures of visual imagery. These cognitive traits were also correlated with participants’ moral and metaphysical judgments (independent of their level of philosophical training) – e.g. participants who scored higher in visualization were less likely to judge that hitting the switch in the trolley problem is permissible but not obligatory, and also less likely to attribute free will and moral responsibility to agents in the rollback universe. Finally, we employed machine learning to develop predictive models that classify a randomly selected participant as either a philosopher or a non-philosopher. Models trained solely on responses to measures for neurodivergent traits achieved better performance than models trained solely on responses to philosophical thought experiments. This suggests that stable, trait-level neurodivergent characteristics may be more diagnostic of philosophical interest, aptitude, or training than judgments philosophers make on domain-relevant problems.

In Chapter 15, Thomas Nadelhoffer and Jennifer Cole Wright investigate the relationship between free will beliefs (or the lack thereof) and existential anxiety. In an attempt to shed light on this relationship, they set out to test whether trait humility can serve as a “buffer” between the two—that is, are people who are high in dispositional humility less likely to experience existential anxiety in the face of skepticism about free will? Given the perspectival and attitudinal nature of humility, Nadelhoffer and Wright predict that humble people will be less anxious in the face of stories about the purported death of free will (or the reduction of the mind to the brain). In a series of four studies, they test their hypothesis, with mixed results.,The findings, however, tell us something important about the current use of primes in studies designed to manipulate people’s belief in free will (usually to measure their pro- or antisocial effects).

Theories of free will are often measured against how well they capture everyday intuitions about free will. But what are these everyday intuitions, and what theoretical commitments do they express? Empirical methods have delivered mixed messages. In response, some free will theorists have developed error theories to undermine the credentials of countervailing intuitions. These efforts are predicated on the idea that people might misunderstand determinism in any of several ways. This paper sheds light on the comprehension problem. We first discuss recent efforts to explain systematic errors in how people interpret determinism. Then, we present the alarming results of two new preregistered studies exploring three types of comprehension failure: (a) epiphenomenal bypassing, (b) fatalistic bypassing, and (c) indeterministic intrusion. Our findings suggest that misunderstanding runs deeper than others have supposed. This casts doubt on existing models of commonsense thinking about free will. Unless and until researchers properly control for the kinds of misunderstandings we identify, research on free will intuitions cannot shed light on whether ordinary thinking reflects commitments to compatibilism or incompatibilism.

Some have argued that advances in the science of human decision-making, particularly research on automaticity and unconscious priming, would ultimately thwart our commonsense understanding of free will and moral responsibility. Do people interpret this research as a threat to their self-understanding as free and responsible agents? We approached this question by seeing how feelings of surprise mediate the relationship between personal sense of control and third-personal attributions of free will and responsibility. Across three studies (_N_ = 1,516) we found that people with a greater sense of personal control were more surprised at the results of experiments showing effects of unconscious priming on moral behavior. Surprise differentially mediated the relationship between personal control and attributions of free will and responsibility: people attributed _less_ free will and _more_ responsibility as they were more surprised. This suggests that people exhibit defensive thinking with respect to responsibility, but not free will.

Some research suggests that moral behavior can be strongly influenced by trivial features of the environment of which we are completely unaware. Philosophers, psychologists, and neuroscientists have argued that these findings undermine our commonsense notions of agency and responsibility, both of which emphasize the role of practical reasoning and conscious deliberation in action. We present the results of four vignette-based studies (N = 1,437) designed to investigate how people think about the metaphysical and moral implications of scientific findings that reveal our susceptibility to automaticity and situational influences. When presented with lightly fictionalized narratives about these findings, participants exhibit no tendency toward changing judgments of freedom and responsibility compared to control groups. This suggests that people seem unwilling to adopt skeptical attitudes about agency on the basis of these scientific findings.

Incompatibilists believe free will is impossible if determinism is true, and they often claim that this view is supported by ordinary intuitions. We challenge the claim that incompatibilism is intuitive to most laypersons and discuss the significance of this challenge to the free will debate. After explaining why incompatibilists should want their view to accord with pretheoretical intuitions, we suggest that determining whether incompatibilism is in fact intuitive calls for empirical testing. We then present the results of our studies, which put significant pressure on the claim that incompatibilism is intuitive. Finally, we consider and respond to several potential objections to our approach.

During the past 20 years, researchers have become increasingly interested in how people ordinarily think about free will and moral responsibility. One central issue that has been explored by experimental philosophers is whether people believe that determinism threatens their commonsense views about moral agency. A related issue that has been explored is whether people believe that advances in neuroscience and other cognate fields pose a similar threat. In this chapter, I will first survey some of the findings on these two compatibility questions. I will then discuss two error theories that experimental philosophers have developed to explain away findings that conflict with their preferred views about commonsense intuitions (namely, bypassing and indeterministic intrusion). As we will see, the gathering evidence suggests that comprehension errors are far more common than researchers have previously assumed. Having discussed the recent work on this issue, I will briefly consider some strategies for addressing it and explain why I am cautiously optimistic that experimental philosophers will find a way forward. Finally, I will highlight some further topics that experimental philosophers have explored when it comes to people’s beliefs about free will and moral responsibility that I did not have space to explore in this chapter.

Some have argued that advances in the science of human decision-making, particularly research on automaticity and unconscious priming, would ultimately thwart our commonsense understanding of free will and moral responsibility. Do people interpret this research as a threat to their self-understanding as free and responsible agents? We approached this question by seeing how feelings of surprise mediate the relationship between personal sense of control and third-personal attributions of free will and responsibility. Across three studies (N = 1,516) we found that people with a greater sense of personal control were more surprised at the results of experiments showing effects of unconscious priming on moral behavior. Surprise differentially mediated the relationship between personal control and attributions of free will and responsibility: people attributed less free will and more responsibility as they were more surprised. This suggests that people exhibit defensive thinking with respect to responsibility, but not free will.

While some philosophers believe disabilities constitute a “bad-difference,” others think they constitute a “mere-difference” (Barnes 2016). On this latter view, while disabilities may create certain hardships, having a disability is not bad in itself. I argue that chronic pain problematizes this disability-neutral view. In doing so, I first survey the literature on chronic pain (§1). Then, I argue that Barnes’s mere-difference view cannot adequately accommodate the lived experiences of many people who suffer from chronic pain (§2). Next, I consider two ways Barnes might respond and I explain why these responses are not workable (§3). Finally, I conclude with a brief discussion of disability variantism, the view that just as some disabilities can be neutral or even positive for some individuals, other disabilities like chronic pain can understandably make some people’s lives miserable not because society has failed them but simply because some conditions can openly conflict with well-being (§4).

Research on the folk psychology of free will suggests that people believe free will is incompatible with determinism and that human decision-making cannot be exhaustively characterized by physical processes. Some suggest that certain elements of Western cultural history, especially Christianity, have helped to entrench these beliefs in the folk conceptual economy. Thus, on the basis of this explanation, one should expect to find three things: a significant correlation between belief in dualism and belief in free will, that people with predominantly incompatibilist commitments are likely to exhibit stronger dualist beliefs than people with predominantly compatibilist commitments, and people who self-identify as Christians are more likely to be dualists and incompatibilists than people who do not self-identify as Christians. We present the results of two studies that challenge two of these expectations. While we do find a significant correlation between belief in dualism and belief in free will, we found no significant difference in dualist tendencies between compatibilists and incompatibilists. Moreover, we found that self-identifying as Christian did not significantly predict preference for a particular metaphysical conception of free will. This calls into question assumptions about the relationship between beliefs about free will, dualism, and Christianity.

Experimental work on free will typically relies on deterministic stimuli to elicit judgments of free will. We call this the Vignette-Judgment model. We outline a problem with research based on this model. It seems that people either fail to respond to the deterministic aspects of vignettes when making judgments or that their understanding of determinism differs from researcher expectations. We provide some empirical evidence for this claim. In the end, we argue that people seem to lack facility with the concept of determinism, which calls into question the validity of experimental work operating under the Vignette-Judgment model. We also argue that alternative experimental paradigms are unlikely to elicit judgments that are philosophically relevant to questions about the metaphysics of free will.

Theories of free will are often measured against how well they capture everyday intuitions about free will. But what are these everyday intuitions, and what theoretical commitments do they express? Empirical methods have delivered mixed messages. In response, some free will theorists have developed error theories to undermine the credentials of countervailing intuitions. These efforts are predicated on the idea that people might misunderstand determinism in any of several ways. This paper sheds light on the comprehension problem. We first discuss recent efforts to explain systematic errors in how people interpret determinism. Then, we present the alarming results of two new preregistered studies exploring three types of comprehension failure: (a) epiphenomenal bypassing, (b) fatalistic bypassing, and (c) indeterministic intrusion. Our findings suggest that misunderstanding runs deeper than others have supposed. This casts doubt on existing models of commonsense thinking about free will. Unless and until researchers properly control for the kinds of misunderstandings we identify, research on free will intuitions cannot shed light on whether ordinary thinking reflects commitments to compatibilism or incompatibilism.

Judgments of blame for others are typically sensitive to what an agent knows and desires. However, when people act negligently, they do not know what they are doing and do not desire the outcomes of their negligence. How, then, do people attribute blame for negligent wrongdoing? We propose that people attribute blame for negligent wrongdoing based on perceived mental control, or the degree to which an agent guides their thoughts and attention over time. To acquire information about others’ mental control, people self-project their own perceived mental control to anchor third-personal judgments about mental control and concomitant responsibility for negligent wrongdoing. In four experiments (N = 841), we tested whether perceptions of mental control drive third-personal judgments of blame for negligent wrongdoing. Study 1 showed that the ease with which people can counterfactually imagine an individual being non-negligent mediated the relationship between judgments of control and blame. Studies 2a and 2b indicated that perceived mental control has a strong effect on judgments of blame for negligent wrongdoing and that first-personal judgments of mental control are moderately correlated with third-personal judgments of blame for negligent wrongdoing. Finally, we used an autobiographical memory manipulation in Study 3 to make personal episodes of forgetfulness salient. Participants for whom past personal episodes of forgetfulness were made salient judged negligent wrongdoers less harshly compared to a control group for whom past episodes of negligence were not salient. Collectively, these findings suggest that first-personal judgments of mental control drive third-personal judgments of blame for negligent wrongdoing and indicate a novel role for counterfactual thinking in the attribution of responsibility.

Advances in Experimental Philosophy of Free Will and Responsibility brings together leading researchers from psychology and philosophy to present new findings and ideas about human agency and moral responsibility. Their contributions reflect the growth of research in these areas over the past decade and highlight both the ways that philosophy can be relevant to empirical research and how empirical work can be relevant to philosophical investigations. Mixing new empirical work with the meta-philosophical and philosophical upshot of the latest research being done, chapters cover motivated cognition and free will beliefs, folk intuitions about manipulation and agency, mental control in assessments of responsibility, the importance of skilled decision making to free will judgments and the relationship between free will and substance dualism. Blending cutting-edge research from philosophy with methods from psychology, this collection is a compelling example of the value of interdisciplinary approaches, contributing to our understanding of the complex networks of attitudes, beliefs, and judgments that inform how we think about agency and responsibility.

This chapter discusses the relevance of recent developments in experimental philosophy and social psychology to fundamental issues that arise in the criminal law — especially when it comes to the decisions made by juries and judges concerning crime and punishment. In light of the empirical research the chapter discusses, it concludes that philosophers and legal theorists alike need to pay more attention to folk intuitions about legal responsibility than has traditionally been the case. In the chapter's view, gaining a perspicuous view of the criminal law requires more work at the cross‐roads of philosophy, psychology, and cognate fields.

There is a longstanding debate in philosophy concerning the relationship between intention and intentional action. According to the Single Phenomenon View, while one need not intend to A in order to A intentionally, one nevertheless needs to have an A-relevant intention. This view has recently come under criticism by those who think that one can A intentionally without any relevant intention at all. On this view, neither distal nor proximal intentions are necessary for intentional action. In this paper we present the results of two studies that explore folk ascriptions of proximal intentions and intentional actions in garden-variety, non-moral cases. Our findings suggest a very tight relationship between the two. We argue that the results from these two studies cohere with the Single Phenomenon View and give theorists who reject this view on conceptual grounds reason to worry.

A key source of support for the view that challenging people’s beliefs about free will may undermine moral behavior is two classic studies by Vohs and Schooler (2008). These authors reported that exposure to certain prompts suggesting that free will is an illusion increased cheating behavior. In the present paper, we report several attempts to replicate this influential and widely cited work. Over a series of five studies (sample sizes of N = 162, N = 283, N = 268, N = 804, N = 982) (four preregistered) we tested the relationship between (1) anti-free-will prompts and free will beliefs and (2) free will beliefs and immoral behavior. Our primary task was to closely replicate the findings from Vohs and Schooler (2008) using the same or highly similar manipulations and measurements as the ones used in their original studies. Our efforts were largely unsuccessful. We suggest that manipulating free will beliefs in a robust way is more difficult than has been implied by prior work, and that the proposed link with immoral behavior may not be as consistent as previous work suggests.

Research on the folk psychology of free will suggests that people believe free will is incompatible with determinism and that human decision-making cannot be exhaustively characterized by physical processes. Some suggest that certain elements of Western cultural history, especially Christianity, have helped to entrench these beliefs in the folk conceptual economy. Thus, on the basis of this explanation, one should expect to find three things: (1) a significant correlation between belief in dualism and belief in free will, (2) that people with predominantly incompatibilist commitments are likely to exhibit stronger dualist beliefs than people with predominantly compatibilist commitments, and (3) people who self-identify as Christians are more likely to be dualists and incompatibilists than people who do not self-identify as Christians. We present the results of two studies (n = 378) that challenge two of these expectations. While we do find a significant correlation between belief in dualism and belief in free will, we found no significant difference in dualist tendencies between compatibilists and incompatibilists. Moreover, we found that self-identifying as Christian did not significantly predict preference for a particular metaphysical conception of free will. This calls into question assumptions about the relationship between beliefs about free will, dualism, and Christianity.

"The development of modern diagnostic neuroimaging techniques led to discoveries about the human brain and mind that helped give rise to the field of neurolaw. This new interdisciplinary field has led to novel directions in analytic jurisprudence and philosophy of law by providing an empirically-informed platform from which scholars have reassessed topics such as mental privacy and self-determination, responsibility and its relationship to mental disorders, and the proper aims of the criminal law. Similarly, the development of neurointervention techniques that promise to deliver new ways of altering people's minds creates opportunities and challenges that raise important and rich conceptual, moral, jurisprudential, and scientific questions. The specific purpose of this volume is to make a contribution to the field of neurolaw by investigating the legal issues raised by the development and use of neurointerventions "--

Much of the literature from political psychology has focused on the negative traits that are positively associated with affective polarization—e.g., animus, arrogance, distrust, hostility, and outrage. Not as much attention has been focused on the positive traits that might be negatively associated with polarization. For instance, given that people who are intellectually humble display greater openness and less hostility towards conflicting viewpoints (Krumrei-Mancuso & Rouse, 2016; Hopkin et al., 2014; Porter & Schumann, 2018), one might reasonably expect them to be less polarized. We ran two studies designed to explore the relationship between various forms of humility and polarization. Our chief finding is that people who value humility are prone to what we are calling epistemic polarization—that is, judging the epistemic traits of contrapartisans negatively—which in turn plays a role in polarization more generally. Not only are contrapartisans deemed to have the wrong moral and political beliefs, they are also viewed as less humble and more arrogant, close-minded, and irrational. This makes matters even worse when it comes to the growing partisan divide. In light of our findings, we believe that the novel concept of epistemic polarization that we introduce is a promising target for further investigation.

In a series of pre-registered studies, we explored (a) the difference between people’s intuitions about indeterministic scenarios and their intuitions about deterministic scenarios, (b) the difference between people’s intuitions about indeterministic scenarios and their intuitions about neurodeterministic scenarios (that is, scenarios where the determinism is described at the neurological level), (c) the difference between people’s intuitions about neutral scenarios (e.g., walking a dog in the park) and their intuitions about negatively valenced scenarios (e.g., murdering a stranger), and (d) the difference between people’s intuitions about free will and responsibility in response to first-person scenarios and third-person scenarios. We predicted that once we focused participants’ attention on the two different abilities to do otherwise available to agents in indeterministic and deterministic scenarios, their intuitions would support natural incompatibilism—the view that laypersons judge that free will and moral responsibility are incompatible with determinism. This prediction was borne out by our findings.

The claim that common sense regards free will and moral responsibility as compatible with determinism has played a central role in both analytic and experimental philosophy. In this paper, we show that evidence in favor of this “natural compatibilism” is undermined by the role that indeterministic metaphysical views play in how people construe deterministic scenarios. To demonstrate this, we re-examine two classic studies that have been used to support natural compatibilism. We find that although people give apparently compatibilist responses, this is largely explained by the fact that people import an indeterministic metaphysics into deterministic scenarios when making judgments about freedom and responsibility. We conclude that judgments based on these scenarios are not reliable evidence for natural compatibilism.

Incompatibilists believe free will is impossible if determinism is true, and they often claim that this view is supported by ordinary intuitions. We challenge the claim that incompatibilism is intuitive to most laypersons and discuss the significance of this challenge to the free will debate. After explaining why incompatibilists should want their view to accord with pretheoretical intuitions, we suggest that determining whether incompatibilism is in fact intuitive calls for empirical testing. We then present the results of our studies, which put significant pressure on the claim that incompatibilism is intuitive. Finally, we consider and respond to several potential objections to our approach.

While most philosophers agree that the concept of intentional action plays an important role in our folk psychology, there is still wide-scale disagreement about the precise nature of this role. Unfortunately, there has traditionally been a dearth of empirical data about folk ascriptions of intentional action. Lately, however, philosophers and psychologists have begun making a concerted effort to fill in this empirical lacuna. In this dissertation, I discuss how this research sheds new light on problems in action theory, moral philosophy, and the philosophy of law. First, I set the stage with a discussion of some of the problems traditionally associated with the concept of intentional action. Here, questions include: What is it to do something intentionally? How are intentional actions related to intentions? What is the relationship between intentional action and conative, cognitive, and moral considerations? In this first section, my main goal is to survey the relevant literature from action theory in order to give the reader a perspicuous view of the kinds of debates that shape the philosophical landscape. Having laid out some of the salient problems, I then turn my attention to some recent empirical research on the folk concept of intentional action and discuss the relevance of this research to the philosophy of action. Next, I compare and contrast the folk concepts of intention and intentional action with their legal counterparts. My goal is to flesh out the extent to which these concepts diverge—a problem that is particularly pressing given that in litigated cases involving juries, jurors are often asked to judge whether the defendant acted intentionally, purposely, knowingly, etc. Finally, I flesh out the implications of the aforementioned data on the folk concept of intentional action and moral psychology—especially blame attribution—for the problem of jury partiality. I argue that the biasing effect that moral considerations have on our ascriptions of intentional action further complicates our attempt to ascertain the proper role that the concepts of intention and intentional action should play in criminal proceedings

Philosophers often suggest that their theories of free will are supported by our phenomenology. Just as their theories conflict, their descriptions of the phenomenology of free will often conflict as well. We suggest that this should motivate an effort to study the phenomenology of free will in a more systematic way that goes beyond merely the introspective reports of the philosophers themselves. After presenting three disputes about the phenomenology of free will, we survey the (limited) psychological research on the experiences relevant to the philosophical debates and then describe some pilot studies of our own with the aim of encouraging further research. The data seem to support compatibilist descriptions of the phenomenology more than libertarian descriptions. We conclude that the burden is on libertarians to find empirical support for their more demanding metaphysical theories with their more controversial phenomenological claims.