Differentiation between visually evoked F and V potentials

Abstract

A frontal dominant wave (F wave), evoked by single photic stimuli presented at intervals of several seconds, and made evident by computer averaging technique, has been described in man and differentiated from the evoked vertex dominant wave (V wave) on the basis of its distribution and latency. The F wave typically culminated between 150 and 200 msec as compared with 110 to 160 msec for the V wave. Amplitude was ordinarily below 20 [mu]V. Normative data have been presented for a group of ninety subjects, in which the wave could be positively identified, in regard to range of latencies, mean latency, range of amplitudes, mean amplitude, range of wave duration, mean duration, frequency of spread to central regions and left-right wave symmetry.