This fMRI and TMS study in human participants examined how the brain learns the level of control one has over outcomes (controllability) and how that estimate then shapes learning — focusing on two prefrontal-subcortical circuits over the course of a controlled behavioral experiment.
Dorsomedial prefrontal cortex (dmPFC) tracked decision-by-decision confidence to estimate controllability via interactions with the dorsal raphe nucleus; TMS disruption of dmPFC impaired control learning. A separate mechanism linked controllability estimates to widespread changes in outcome signals, including dopamine-associated midbrain nuclei and credit-assignment signals in a distinct prefrontal subregion.
Causal disruption (TMS) was limited to dmPFC only, leaving the dorsal raphe and other nodes untestable. The study was conducted solely in humans, limiting generalizability across species. fMRI temporal resolution constrains precise sequencing of circuit-level interactions.
This research is preclinical/mechanistic and not yet directly actionable in clinical settings, but it provides a neural framework for understanding how perceived lack of control impairs motivation and learning — relevant to conditions like depression and learned helplessness.
Explore related topics
