Eggermont J J
Department of Psychology, University of Calgary, Alberta, Canada.
J Acoust Soc Am. 1995 Aug;98(2 Pt 1):911-20. doi: 10.1121/1.413517.
The representation of voice onset time (VOT) for 197 single units in cat primary auditory cortex was studied for a /ba/-/pa/ continuum in which VOT was varied in 5-ms steps from 0 to 70 ms. The effect of stimulus intensity, characteristic frequency of the neurons, and age of the animals was investigated. The minimum VOT represented in onset responses to both the voiceless and voiced parts of the sound (a "double-on" response) was dependent on overall stimulus level. An interaction was found between the efficacy of the burst in evoking neural activity and the size of the subsequent response to the onset of voicing. There was only a minor difference in the mean values for the minimal neural VOT for young (42 ms), juvenile (36 ms), and adult animals (46 ms), albeit that for individual young and juvenile animals more frequently values close to 10-15 ms were found. The cumulative distribution for the adult group showed a relative lack of neural VOTs around 30-40 ms. No other cues in the single unit and local neuronal group firing rate representation of VOT were found that were related to the categorical perception boundary.
研究了猫初级听觉皮层中197个单个神经元对/ba/-/pa/连续体的语音起始时间（VOT）表征，其中VOT以5毫秒的步长从0变化到70毫秒。研究了刺激强度、神经元的特征频率和动物年龄的影响。对声音的无声部分和有声部分的起始反应中所代表的最小VOT（“双起始”反应）取决于总体刺激水平。发现爆发诱发神经活动的效力与随后对语音起始的反应大小之间存在相互作用。幼龄动物（42毫秒）、幼年动物（36毫秒）和成年动物（46毫秒）的最小神经VOT平均值仅有微小差异，尽管在个别幼龄和幼年动物中，更常发现接近10 - 15毫秒的值。成年组的累积分布显示在30 - 40毫秒左右相对缺乏神经VOT。在VOT的单个神经元和局部神经元群放电率表征中，未发现与类别感知边界相关的其他线索。
