Mapping brain networks underlying abstract perceptual decision formation and its EEG signatures

Parietal-opercular regions dominate the response-locked and non-motor-required peak-locked centroparietal positivity (CPP) in a supramodal, motor-independent change-detection paradigm.

• Why it matters: The CPP is linked to evidence accumulation across senses, but its cortical sources and the decision-related network remain uncertain.
• What they did: The study combined separate-session fMRI and EEG in the same supramodal change-detection task, using individualized finite element head modeling and fMRI–EEG forward modeling plus conjunction across modalities and motor contexts.
• The result: A consistent bilateral parietal–opercular network (including postcentral, supramarginal, superior parietal lobules, precentral gyrus, central operculum, middle frontal gyrus, and cerebellum) was identified, enabling targeted testing in future decision tasks.

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