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Poster Session B: Wednesday, August 13, 1:00 – 4:00 pm, de Brug & E‑Hall

Putamen Representation of Habit as Predictive Marker of Compulsivity

Amogh Johri¹, Rani Gera, Vincent Man; ¹California Institute of Technology

Presenter: Amogh Johri

Compulsivity, marked by rigid and repetitive behaviors, is hypothesized to arise from overreliance on habitual control systems. We combined a habit-learning task with fMRI and multivariate pattern analysis to test whether the neural signatures of habitual control overlap with compulsive traits, as measured by the OCI-R. A cluster in the left posterior putamen reliably decoded Habitual versus Goal-Directed participants and classified high versus low OCI-R groups independently of behavioral habit expression. Cross-decoding revealed shared neural representations linking habitual control and compulsivity. Our results highlight overlapping neural substrates of habitual control and compulsivity, providing insight into the dimensional mechanisms of compulsive behavior.

Topic Area: Memory, Spatial Cognition & Skill Learning

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