Brain, Vol. 112, No. 1, 233-244, 1989
© 1989 Oxford University Press
research-article |
THE BEREITSCHAFTSPOTENTIAL IS ABNORMAL IN PARKINSON'S DISEASE
University Department of Neurology and Parkinson's Disease Society Research Centre, Institute of Psychiatry and King's College Hospital Medical School London
Correspondence to:
Correspondence to: Professor C. D. Marsden, University Department of Clinical Neurology, Institute of Neurology, The National Hospital for Nervous Diseases, Queen Square, London WCIN 3BG.
The average Bereitschaftspotential (BP) preceding a rapid, self-paced voluntary extension movement of the index finger was recorded from 6 scalp locations in 14 patients with Parkinson's disease who had been withdrawn from their normal drug therapy for at least 12 h before testing. The amplitude of the potential was measured at the peak negativity (Nl) and 650 ms prior to this (NSI), and compared with that recorded in a group of 12 age-matched control subjects. The Nl amplitude was the same as in the normals, but the NS1 component was smaller in the patients, especially in midline leads As a result, the rise in the BP between the peak NS1 and Nl component (termed NS2) was larger in the patient group.
The NS1 component of the BP is thought to reflect preparatory activity in the supplementary motor area (SMA) of cortex. Since the basal ganglia provide a major source of afferent input to SMA, the reduction in NS1 in the patients probably results from inadequate basal ganglia activation of SMA. The larger NS2 component may reflect extra activity in other brain areas to compensate for the reduced SMA activity.
Received August 18, 1987. Revised May 4, 1988. Accepted May 30, 1988.
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