An 8-channel Grass Model III electroencephalograph was employed for EEG recording and to provide pre-amplification of signals processed by 2 computers of average transients (CAT). The frequency response of the system, selected for optimal rejection of myogenic potentials, was such that output amplitude was down 40 % and 80% at 50 c/sec and 100 c/sec respectively (see Kooi and Bagchi 1964a). The scalp electrode
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