EVENT-RELATED SYNCHRONIZATION OF MU-RHYTHM IN THE EEG OVER THE CORTICAL HAND AREA IN MAN

Spontaneous EEG activity was recorded at 56 electrodes in 3 healthy su bjects. All subjects displayed event-related desynchronization (ERD) o f mu rhythms over the cortical hand area during discrete finger moveme nt. In contrast to this, foot movement resulted in an enhancement or e vent-related synchronization (ERS) of mu rhythms over the hand area. T his phasic synchronization of mu waves was circumscribed and found at electrodes overlying both cortical hand areas. It is speculated, that this ERS represents a short lasting 'idling state' of hand area neuron s when other body parts are moved.