We investigated cerebellar deficits in dual-motor-tasking in Parkinson’s disease (PD) patients. Eighteen PD patients (scanned ON and OFF dopaminergic medication) and 18 matched controls performed simultaneous finger movements in a coupled or individuated fashion, and with different visual cues at 3T. We showed that cerebello-striatal network interactions play a role in symptomatic dual tasks in PD, and is influenced by dopaminergic medication. Our data suggest that cerebellar-striatal loop is involved in planning fine dexterous tasks without interacting with the cortical motor areas.
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