嗓声鉴别的脑事件相关电位研究

STUDY ON EVENT-RELATED POTENTIALS FOR DISCRIMINATION OF VOICES

该项工作研究了21名女大学生和研究生鉴别两个陌生人的噪声时,六个脑区的事件相关电位(ERPs)。结果表明,双音节语义嗓声的鉴别更易引起明显的ERPs变化;两个陌生人嗓声不等概率呈现,较等概率呈现更易引起明显的ERPs变化。在单音节嗓声鉴别中,在左额区引起N200波波幅增高;而在右颞区引起P300波潜伏期的增长。在双音节语义嗓声鉴别中,除右顶叶外在其它五个脑区引起P300波波幅增高,在右额区引起P300波潜伏期明显缩短。

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.