Frequency difference limens at high frequencies: Evidence for a transition from a temporal to a place code
Frequency difference limens at high frequencies: Evidence for a transition from a temporal to a place code
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DOI：
10.1121/1.4739444
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发表时间：
2012-09-01
影响因子：
2.4
通讯作者：
Ernst, Stephan M. A.
中科院分区：
文献类型：
--
作者：
Moore, Brian C. J.;Ernst, Stephan M. A.
通常认为，纯音的频率差限（DLF）取决于高达4-5 kHz的频率的时间机制（锁相）和更高频率的位置机制。从位置机制预测的DLF，表示为中心频率的比例（Δ f/f），在中频到高频处应近似不随频率变化。如果存在从时间机制到位置机制的过渡，则Δ f/f应该随着中心频率的增加而增加，直到过渡发生，然后达到平台。公布的数据没有显示这种影响。在这项研究中，使用设计用于在鼓膜处产生平坦响应的耳机，测量了中心频率从2到14 kHz的DLFs。每个音调的水平在+/-4 dB的范围内变化，以减少响度提示。Δ f/f的值从2 kHz到8 kHz逐渐增加，但对于8 kHz到14 kHz的频率没有显著变化。结果是一致的想法，有一个过渡，从时间到一个地方的机制，在约8 kHz，而不是在4-5 kHz，因为通常假设。(C)2012年美国声学学会。[http：//dx.doi.org/10.1121/1.4739444]
It is commonly believed that difference limens for frequency (DLFs) for pure tones depend on a temporal mechanism (phase locking) for frequencies up to 4-5 kHz and a place mechanism at higher frequencies. The DLFs predicted from a place mechanism, expressed as a proportion of center frequency (Delta f/f), should be approximately invariant with frequency at medium to high frequencies. If there is a transition from a temporal to a place mechanism, Delta f/f should increase with increasing center frequency until the transition occurs, and then reach a plateau. Published data do not show such an effect. In this study, DLFs were measured for center frequencies from 2 to 14 kHz, using earphones designed to produce a flat response at the eardrum. The level of every tone was varied over a range of +/- 4 dB, to reduce loudness cues. The value of Delta f/f increased progressively from 2 to 8 kHz, but did not change significantly for frequencies from 8 to 14 kHz. The results are consistent with the idea that there is a transition from a temporal to a place mechanism at about 8 kHz, rather than at 4-5 kHz, as is commonly assumed. (C) 2012 Acoustical Society of America. [http://dx.doi.org/10.1121/1.4739444]