Abstract: Event-related potentials (ERPs) in six brain areas for discriminationbetween voices of two unfamiliar speakers were stadied in 21 female students.The results showed that the sementic voices in double syllables elicitedmore obvious changes in ERPs than those evoked by the voices in singlesyllables. The voices of the two speaker's presented with differentprobability evoked more obvious changes in ERPs than those elicited bythe voices of the two speaker's presented with equal probability. The dis-crimination of the voices in single syllable increased the amplitudes ofN200 waves at the left frontal area and latencies of P300 waves at the lefttemporal area. The discrimination of the semantic voices in double syllab-les increased the amplitudes of P300 waves at the studied brain areas ex-cept the right pariental area, and decreased latencies of P300 waves at theright frontal area.

Key words: voice discrimination, event-related potentials, semantic voice, P300 waves, mismatch negativity