For years, experimental philosophers have attempted to discern whether laypeople find free will compatible with a scientifically deterministic understanding of the universe, yet no consensus has emerged. The present work provides one potential explanation for these discrepant findings: People are strongly motivated to preserve free will and moral responsibility, and thus do not have stable, logically rigorous notions of free will. Seven studies support this hypothesis by demonstrating that a variety of logically irrelevant (but motivationally relevant) features influence compatibilist judgments. (...) In Study 1, participants who were asked to consider the possibility that our universe is deterministic were more compatibilist than those not asked to consider this possibility, suggesting that determinism poses a threat to moral responsibility, which increases compatibilist responding (thus reducing the threat). In Study 2, participants who considered concrete instances of moral behavior found compatibilist free will more sufficient for moral responsibility than participants who were asked about moral responsibility more generally. In Study 3a, the order in which participants read free will and determinism descriptions influenced their compatibilist judgments—and only when the descriptions had moral significance: Participants were more likely to report that determinism was compatible with free will than that free will was compatible with determinism. In Study 3b, participants who read the free will description first (the more compatibilist group) were particularly likely to confess that their beliefs in free will and moral responsibility and their disbelief in determinism influenced their conclusion. In Study 4, participants reduced their compatibilist beliefs after reading a passage that argued that moral responsibility could be preserved even in the absence of free will. Participants also reported that immaterial souls were compatible with scientific determinism, most strongly among immaterial soul believers (Study 5), and evaluated information about the capacities of primates in a biased manner favoring the existence of human free will (Study 6). These results suggest that people do not have one intuition about whether free will is compatible with determinism. Instead, people report that free will is compatible with determinism when desiring to uphold moral responsibility. Recommendations for future work are discussed. (shrink)

We linked between the social-psychology and experimental-philosophy paradigms for the study of folk intuitions and beliefs regarding the concept of free will to answer three questions: (1) what intuitions do people have about free-will and determinism? (2) do free will beliefs predict differences in free-will and determinism intuitions? and (3) is there more to free-will and determinism than experiencing certainty or uncertainty about the nature of the universe? Overall, laypersons viewed the universe as allowing for human indeterminism, and they did (...) so with certainty. Examining intuitions of prosociality, future-orientation, learning, meaningfulness, human uniqueness, and well-being, ratings were highest in the indeterministic universe condition and lowest in the deterministic universe condition, both significantly different from the uncertain universe condition. Participants’ free will beliefs had only weak impact on realism, happiness, and learning intuitions, but did not reverse the general intuition favoring indeterminism, and showed no impact on other intuitions. (shrink)

Previous research suggests that free will beliefs and moral responsibility beliefs are strongly linked, yet ultimately distinct. Unfortunately, the most common measure of free will beliefs, the free will subscale (FWS) of the Free Will and Determinism Plus, seems to confound free will beliefs and moral responsibility beliefs. Thus, the present research (1,700 participants across two studies) details the development of a 2-factor FWS – the FWS-II – that divides the FWS into a free will subscale and a moral responsibility (...) subscale. The FWS-II showed good fit compared to standard fit thresholds and superior fit compared to the original FWS. The moral responsibility subscale was moderately correlated with general punitive attitudes and specific punitive assignments, even when controlling for the free will subscale. Conversely, the free will subscale was moderately correlated with conservativism and religiosity, even when controlling for the moral responsibility subscale. These results provide evidence that the FWS is better suited – psychometrically, theoretically, and practically – as a 2-factor measure of free will beliefs and moral responsibility beliefs than as a 1-factor measure of free will beliefs. (shrink)

Two experiments tested the hypothesis that neurological abnormalities decrease punishment by decreasing perceptions of free will. Experiment 1 found that a brain tumor decreased punishment for criminal behavior by decreasing perceptions of the afflicted criminal’s free will. This effect was stronger for liberal and non-religious participants than for conservative and religious participants. Experiment 2 replicated Experiment 1 and additionally found that a brain tumor decreased perceptions of the afflicted criminal’s conscious decisions and true self, thereby decreasing perceptions of his free (...) will, thereby decreasing his punishment. Collectively, these results suggest that neurological abnormalities decrease punishment by decreasing perceptions of free will, especially among liberals and non-religious people. These results also suggest that neurological abnormalities decrease perceptions of free will – and ultimately decrease punishment – by decreasing perceptions of conscious decisions and the true self. (shrink)

The empirical investigation of free will beliefs is a fascinating and extensive field, offering potential insights into the extent and ramifications of free will beliefs, but this research is not without its limitations. Many competing definitions of free will exist. These competing definitions have informed the variety of free will manipulations and measures currently used, often without researchers properly addressing the important differences in the understandings of free will being operationalised, manipulated and measured. These manipulations and measures are also typically (...) broad ranging, also including statements targeting determinism, reductionism and other related constructs. They therefore lack the focus necessary to identify just what aspect of these supposed free will manipulations are actually impacting cognitions, beliefs, and behaviours. Across 7 studies we address some of these limitations. Study 1 confirms past findings demonstrating that perceptions of having choice and being free from constraints are central to lay understandings of free will. Study 1 also tests new single item measures of free will and determinism. In studies 2 and 3 we use our new measure of lay free will, to demonstrate that the previously established utility of free will beliefs for predicting subjective wellbeing, is due to the perceptions of having control that form the core of lay free will beliefs. We then reason that, as pro deterministic/anti free will messages can undermine free will beliefs these manipulations may also impact perceived control and subsequently indicators of subjective wellbeing. Studies 4 and 5 demonstrate that an abridged version of the Crick essay, can undermine perceived control. This suggests that past successful manipulations of behaviour via the Crick essay, may have been due, at least in part, to reductions in perceived control rather than just free will beliefs. The Crick essay is a broad ranging, poorly focused manipulation, simultaneously championing determinism while undermining the idea of free will. We therefore then endeavour to create two new, better focused, manipulations of free will/determinism, with reduced demand characteristics. In study 6 our TMS manipulation lead to a significant reduction between participants’ pre and post manipulation scores but this was also true for participants in the neutral condition. These complex findings are explored, suggesting that placing participants in an intimidating environment may undermine their perceptions of having free will. In study 7 our deterministic video manipulation successfully undermines free will belief but does not undermine perceived control or self-efficacy. These findings are explored further with participants’ agreement with the deterministic or non-deterministic video lecture, moderating the impact of condition on participants’ ratings of free will, self-efficacy and perceived control. When compared to non-determinism, high agreement with determinism was associated with lower perceived control and free will belief. By contrast low agreement with determinism was associated with higher perceived control self-efficacy and free will. In study 1 we created a new measure of cheating/dishonesty that can be used online. In study 7 we used this new measure of cheating and contrary to our predictions, exposure to a deterministic argument led to less cheating than exposure to a non-deterministic argument. In the general discussion the various strands of research are brought together and their contribution to the literature discussed. The limitations of our research are explored with new ideas proposed to address those limitations and further our work. Taken together, the research outlined in this thesis provides valuable new insight into the nature and implications of beliefs relating to free will and determinism, provides a valuable critique of research in this field and offers suggestions to improve and extend the current literature. (shrink)