Behavioral and physiological correlates of temporal pitch perception in electric and acoustic hearing.
Behavioral and physiological correlates of temporal pitch perception in electric and acoustic hearing.
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DOI：
10.1121/1.2821986
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发表时间：
2008-02
期刊：
影响因子：
--
通讯作者：
Winter IM
中科院分区：
文献类型：
--
作者：
Carlyon RP;Mahendran S;Deeks JM;Long CJ;Axon P;Baguley D;Bleeck S;Winter IM
在实验1的“4-6”条件下，听力正常的听者将带通滤波脉冲序列的音调与等时脉冲序列的音调进行比较，该脉冲序列的脉冲间隔在4到6毫秒之间交替。与在较低信号电平下获得的先前结果一致，4-6个刺激的音调对应于具有5.7ms周期的同步脉冲序列的音调--长于5ms的平均IPI。在其他情况下，IPI在3.5-5.5ms和4.5-6.5ms之间交替。实验2类似，但给出了CI的一个通道的电脉冲序列。在这两种情况下，随着总体IPI的增加，交替间隔刺激的音调接近具有等于平均IPI的周期的等时列车的音调。实验3测定了豚鼠和NH听者对交替间隔刺激的复合动作电位(CAPS)。对4ms间隔后发生的脉冲的上限小于对6ms间隔后发生的脉冲的响应，从而产生独立于总电平的调制模式。结果与包含听神经(AN)不应性的简单模型的预测进行了比较，其中基音是根据AN响应中的一阶间隔来估计的。
In the “4-6” condition of experiment 1, normal-hearing (NH) listeners compared the pitch of a bandpass-filtered pulse train, whose inter-pulse intervals (IPIs) alternated between 4 and 6 ms, to that of isochronous pulse trains. Consistent with previous results obtained at a lower signal level, the pitch of the 4-6 stimulus corresponded to that of an isochronous pulse train having a period of 5.7 ms – longer than the mean IPI of 5 ms. In other conditions the IPI alternated between 3.5-5.5 ms and 4.5-6.5 ms. Experiment 2 was similar but presented electric pulse trains to one channel of a CI. In both cases, as overall IPI increased, the pitch of the alternating-interval stimulus approached that of an isochronous train having a period equal to the mean IPI. Experiment 3 measured compound action potentials (CAPs) to alternating-interval stimuli in guinea pigs and in NH listeners. The CAPs to pulses occurring after 4-ms intervals were smaller than responses to pulses occurring after 6-ms intervals, resulting in a modulated pattern that was independent of overall level. The results are compared to the predictions of a simple model incorporating auditory-nerve (AN) refractoriness, and where pitch is estimated from 1st-order intervals in the AN response.
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