Abnormalities in the face primary motor cortex in oromandibular dystonia

•The excitability and sensorimotor integration of face and hand primary motor cortex in oromandibular dystonia (OMD) was studied.•In OMD, sensorimotor integration and cortical excitability were altered specifically in face primary motor cortex.•In OMD, the integration between sensory inflow and motor output is disrupted at cortical level with topographic specificity.