What does the brain show when you choose freely?
When people act freely, specific brain regions become more active compared to when they follow orders. In a 2025 fMRI study, participants who freely chose to deliver a mild shock showed stronger activity in the occipital lobe, frontal gyrus, precuneus, and lateral occipital cortex compared to when they were coerced [1]. These regions correlated with a measurable phenomenon called 'temporal binding' — a distortion in time perception where voluntary actions feel like they happen closer to their outcomes. This suggests the brain literally marks free choices differently from forced ones.
A 2021 study found that the medial frontal gyrus is especially important for preserving a sense of agency under coercion. Participants who showed greater activity in this area also reported feeling more responsible for their actions, even when they were following orders [4]. This indicates that the brain has a built-in mechanism for feeling like the author of your own actions, and that feeling can be measured.
Does the Libet experiment prove free will is an illusion?
The famous Libet experiments from the 1980s found that brain activity (the 'readiness potential') begins up to a second before people consciously decide to move. This has been used to argue that the brain decides first, and conscious free will is just a post-hoc story. However, a 2022 analysis by philosopher Alfred Mele points out a critical flaw: these experiments measure when people become aware of a decision, not when the decision itself is made [5]. It's possible the decision happens at the same time as the brain activity, and the conscious awareness lags slightly — which wouldn't disprove free will.
Mele also notes that the experiments use simple, trivial decisions (like when to press a button), which may not generalize to meaningful moral choices. The 2025 study on moral decision-making supports this: when people made choices about harming another person, the neural patterns were more complex and involved social cognition regions, not just motor planning [1]. So the Libet findings may apply only to a narrow type of decision, not to free will in general.
Where do scientists agree and disagree?
There is broad agreement that the brain processes voluntary and coerced actions differently. Both the 2021 and 2025 studies found that temporal binding — a proxy for sense of agency — is reduced when people follow orders [1][4]. This means the brain's response to coercion is measurable and consistent across different groups, including civilians and military personnel [1]. The 2025 study found no significant neural differences between these groups, suggesting the basic brain mechanisms for agency are universal.
The major disagreement is about what these findings mean for free will. Some researchers, like Hans Liljenström in a 2025 paper, argue that current physics and neuroscience cannot rule out free will because they rely on deterministic or random models that don't capture the complexity of conscious agency [2]. Others maintain that the Libet-style experiments show free will is an illusion. The evidence itself doesn't settle this — it shows that the brain has measurable signatures of voluntary action, but whether those signatures constitute 'free will' is a philosophical question, not a purely scientific one.
Sources used in this answer
Neural correlates of the sense of agency in free and coerced moral decision-making among civilians and military personnel
fMRI showed that sense of agency (measured by temporal binding) is reduced when following orders vs. acting freely, with activity in frontal gyrus, precuneus, and occipital cortex correlating with agency; no differences between civilians and military personnel.
Can physics and neuroscience allow for free will?
Argues that neither deterministic nor quantum physics can currently account for consciousness and agency, and that science needs to extend beyond 'chance and necessity' to allow for free will.
From the origins to the stream of consciousness and its neural correlates
Proposes Cognitive Evolution Theory, which frames consciousness as a discrete chain of states arising from critical brain dynamics, with volitional triggers from brainstem arousal centers.
The obedient mind and the volitional brain: A neural basis for preserved sense of agency and sense of responsibility under coercion
fMRI found that medial frontal gyrus activity was reliably associated with greater sense of agency and responsibility under coercion; participants who gave more shocks under free choice showed reduced activity in social cognition areas.
Free Will and Neuroscience
Critiques Libet-style experiments, showing they make unwarranted empirical claims about when decisions are made and when awareness occurs, and that they don't generalize to all types of decisions.