Pitch of amplitude-modulated irregular-rate stimuli in acoustic and electric hearing
Pitch of amplitude-modulated irregular-rate stimuli in acoustic and electric hearing
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DOI：
10.1121/1.1577551
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发表时间：
2003-09-01
影响因子：
2.4
通讯作者：
Wouters, J
中科院分区：
文献类型：
--
作者：
van Wieringen, A;Carlyon, RP;Wouters, J
刺激的音高进行了研究的条件下，兴奋的地方是保持不变的，因此，音高来自“纯粹的时间”线索。在实验1中，声和电脉冲串由脉冲组成，其幅度在高值和低值之间交替，并且其脉冲间间隔在4和6 ms之间交替。在条件A中，衰减脉冲发生在4 ms间隔之后，并且在条件B中，衰减脉冲发生在6 ms间隔之后。对于听力正常的受试者和耳蜗植入者来说，与这个“4-6”刺激的音高相等的等幅脉冲串的周期从最小调制深度处的近6 ms增加到最大深度处的近10 ms。另外，在条件A中的调制脉冲串被感知为在音调上低于条件B中的那些。在条件A中，数据被解释为增加的不应性，其中较大的脉冲比条件B中更紧密地跟随较小的脉冲。与这一结论相一致，A-B差异在较长的脉冲间隔时减小。这些研究结果提供了一个措施的阈上效应的不应性音高知觉，并增加我们的理解的时间信息的编码人工耳蜗植入语音处理方案。(C)2003年，美国声学学会。
The pitch of stimuli was studied under conditions where place-of-excitation was held constant, and where pitch was therefore derived from "purely temporal" cues. In experiment 1, the acoustical and electrical pulse trains consisted of pulses whose amplitudes alternated between a high and a low value, and whose interpulse intervals alternated between 4 and 6 ms. The attenuated pulses occurred after the 4-ms intervals in condition A, and after the 6-ms intervals in condition B. For both normal-hearing subjects and cochlear implantees, the period of an isochronous pulse train equal in pitch to this "4-6" stimulus increased from near 6 ms at the smallest modulation depth to nearly 10 ms at the largest depth. Additionally, the modulated pulse trains in condition A were perceived as being lower in pitch than those in condition B. Data are interpreted in terms of increased refractoriness in condition A, where the larger pulses are more closely followed by the smaller ones than in condition B. Consistent with this conclusion, the A-B difference was reduced at longer interpulse intervals. These findings provide a measure of supra-threshold effects of refractoriness on pitch perception, and increase our understanding of coding of temporal information in cochlear implant speech processing schemes. (C) 2003 Acoustical Society of America.