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A Developmental Study of Movement‐Related Brain Macropotentials during Skilled Performances a

A characteristic sequence of brain potentials develops when a human performs self-paced skillful actions and receives real-time feedback about his performance. On the basis of the spatio-temporal characteristics of these potentials and their relationship to electromyographic (EMG) activity and performances it was proposed (Papakostopoulos, 1978b) that there are four successive time periods during each self-paced act ion. The “premotor period” precedes the performance and is dominated by the Bereitschaftspotential (BP, Kornhuber and Deecke, 1965; Vaughan et al., 1968). The “motor sensory period” follows the onset of the EMG and continues up to 80 ms after the peak of the EMG. This period is dominated by the Motor Cortex Potential (MCP, Papakostopoulos et al., 1975). During the following “motor completion period” when the EMG activities decline a positive peak, with a latency of 200 ms (P~oo), has been reported (Vaughan et al., 1968; Papakostopoulos, 1980). The “postmotor period” during skilled performance is characterized by a large positivity with a latency of 460 ms known as the Skilled Performance Positivity (SPP, Papakostopoulos 1978a,b, 1980). It has been shown in adults, by scalp and cortical recordings, that the movementrelated brain macropotentials (MRBMs) that develop during each period vary independently. This suggests that they are generated by different neuronal systems. The purpose of the present study was to extend this work to children and to test the hypothesis that there is a different rate of maturation for each one of the potentials related to self-paced skilled performance.