Does doubting free will weaken the feeling of controlling your actions?
Reading an essay arguing that free will is an illusion reduced people's implicit sense of causing their own actions' effects, but not their conscious judgments of control.
Source
Priming determinist beliefs diminishes implicit (but not explicit) components of self-agency
Study at a glance
- Design
- Human experiment — Within-subjects, two sessions a week apart (order counterbalanced): participants read either a Francis Crick essay denying free will or a neutral essay on consciousness, then did an intentional binding task (implicit agency) and an action-outcome judgment task (explicit agency)
- N
- N=51 · 52 Ghent University students were recruited; 1 did not return for the second session, leaving 51. Exploratory analyses split them into 'responders' and 11 'reactant' participants whose free-will belief rose after the anti-free-will essay.
- Population
- Students aged 18 to 24 at Ghent University, Belgium
- Outcome
- Intentional binding (compression of perceived time between a key press and a tone) and explicit 1-4 agency ratings over coloured-square outcomes; free-will subscale of the FAD+ as manipulation check
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Students came to the lab twice, a week apart, and in one session read an essay by Francis Crick arguing that free will is illusory and in the other a neutral essay about consciousness research. After reading they did two agency tasks: an intentional binding task, in which they judged on a rotating clock when they pressed a key or heard a tone that followed the press, and an explicit task in which they learned which key produced which coloured square and then rated whether they or the computer had caused each square. A free-will belief questionnaire served as a manipulation check.
What they found
The anti-free-will essay produced a small but significant shift toward determinist beliefs (Cohen's d about 0.21). Intentional binding shrank from 100.116 ms in the control session to 76.973 ms in the anti-free-will session, significant only in a one-tailed test; in the responders whose beliefs moved as intended the drop was clearer, while the 11 reactant participants showed no reduction. Explicit agency ratings showed the usual effects of action-outcome congruency and delay but no effect of the belief manipulation, and a direct comparison confirmed the two tasks were affected differently.
The limits
What it doesn't show
The key implicit effect was small and reached significance only with a one-tailed test, and the responder/reactant split was exploratory and post hoc, so replication is needed. The belief manipulation itself was weak, and the two essays differed in more than their stance on free will (length and emotional tone), so something other than belief could drive the difference. The sample was 51 young university students, mostly men, and intentional binding is an indirect, debated measure of the sense of agency.
Key terms
- Sense of agency
- The experience of being the one who controls one's own actions and, through them, events in the world.
- Intentional binding
- The finding that a voluntary action and its outcome are perceived as closer together in time than they really are; used as an implicit measure of agency.
- Implicit vs explicit agency
- Implicit agency is the pre-reflective feeling of control shown in perception; explicit agency is a conscious judgment such as rating whether you caused an event.
- Within-subjects design
- Each participant experiences every condition, so they serve as their own control, removing pre-existing group differences.
- Reactance
- A response in which people push back against persuasion, here reporting stronger free-will belief after reading an anti-free-will text.
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Quiz yourself
Which measure was affected by reading the anti-free-will essay?
Common questions
Why does it matter that only the implicit measure changed?
It suggests beliefs about free will affect the low-level, pre-reflective experience of control rather than conscious judgments, and it also argues against simple demand effects, since participants trying to please the experimenter would more easily change their explicit ratings.
Is a one-tailed test acceptable here?
The authors justified it because they predicted a decrease in advance, but it halves the p-value for the predicted direction, so the effect should be treated as tentative until replicated.
Why analyse responders and reactants separately?
If the manipulation works through belief change, people whose beliefs did not move in the intended direction should not show the effect. That is what happened, which supports the interpretation, but the split was exploratory.
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