熟悉嗓声识别中猴脑的事件相关电位

在四只三岁龄雄性猕猴(Macaca mulatta)中,研究了识别熟悉人与陌生人、熟悉猴与陌生猴嗓声中的脑事件相关电位(ERPs)。结果表明,对熟悉猴和陌生猴的噪声“er”所诱发的ERPs在左颞区和左、右两顶区存在着显著差异。熟悉猴嗓声在左颞区诱发的P200波潜伏期长,左顶区N100波幅值大,在左、右顶区P300波潜伏期短。熟悉人与陌生人嗓声“pa”诱发的ERPs在左、右顶区P200波潜伏期有显著性差异,熟悉“Pa”诱发反应潜伏期短。熟悉人与陌生人噪声“ba”诱发的ERPs没有差异。熟悉猴嗓声与熟悉人嗓声加“pa”诱发的ERPs相比,在右颞区的P300波幅值显著变大,两顶区N100波幅值也增大,在右顶区P200和P300波的潜伏期也明显变短。顶问区N100波潜伏期短、幅值高。陌生人与陌生猴“pa”嗓声诱发的ERPs间没有差异。熟悉猴嗓声和陌生猴嗓声出现的概率不同,并不引起ERPs的明显差异。

MONKEY'S ERPs DURING IDENTIFICATION OF FAMILIAR VOICES

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".