Electrophysiological signs of supplementary‐motor‐area deficits in high‐functioning autism but not Asperger syndrome: an examination of internally cued movement‐related potentials

Aims  Motor dysfunction is common to both autism and Asperger syndrome, but the underlying neurophysiological impairments are unclear. Neurophysiological examinations of motor dysfunction can provide information about likely sites of functional impairment and can contribute to the debate about whether autism and Asperger syndrome are variants of the same disorder or fundamentally distinct neurodevelopmental conditions. We investigated the neurophysiology of internally determined motor activity in autism and Asperger syndrome via examination of movement‐related potentials (MRPs).