Striatal BOLD and midfrontal theta power express motivation for action
Number of pages
SourceCerebral Cortex, (2021)
24 november 2021
Article / Letter to editor
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SW OZ DCC SMN
PI Group MR Techniques in Brain Function
PI Group Motivational & Cognitive Control
Subject150 000 MR Techniques in Brain Function; 170 000 Motivational & Cognitive Control; Action, intention, and motor control
Action selection is biased by the valence of anticipated outcomes. To assess mechanisms by which these motivational biases are expressed and controlled, we measured simultaneous EEG-fMRI during a motivational Go/NoGo learning task (N = 36), leveraging the temporal resolution of EEG and subcortical access of fMRI. VmPFC BOLD encoded cue valence, importantly predicting trial-by-trial valence-driven response speed differences and EEG theta power around cue onset. In contrast, striatal BOLD encoded selection of active Go responses and correlated with theta power around response time. Within trials, theta power ramped in the fashion of an evidence accumulation signal for the value of making a "Go" response, capturing the faster responding to reward cues. Our findings reveal a dual nature of midfrontal theta power, with early components reflecting the vmPFC contribution to motivational biases, and late components reflecting their striatal translation into behavior, in line with influential recent "value of work" theories of striatal processing.
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