Abstract: Event-related potentials making discrimination between familiar and unfa-miliar voices of persons or monkeys were studied in four male monkeys(Maca-ca Mulatta). The familiar monkey's voice "er" evoked ERPs in four monkeyshigher N_(100) amplitude, in the left parietal area, longer Iatency of P_(200) wavein the left temporal area, shorter latency of P_(300) wave in the temporal areas.Familiar person's voice "pa" evoked shorter latency of P_(200) wave in the pari-etal areas. In comparing ERPs evoked by familiar voices between monkey andperson, familiar monkey's voice elicited higher amplitudes of P_(300) in the righttemporal and N_(100) in parietal areas, shorter latency of P_(200), P_(300) in the rightparietal area.No differences were noticed among ERPs by the voices displayedwith different probabilities nor any differences in ERPs evoked by voices ofunfamiliar monkey "er" and person's "pa".

Key words: Voice recognition, Event-related potentials, Macaca Mulatts