Pitch perception at very high frequencies: On psychometric functions and integration of frequency information.
Pitch perception at very high frequencies: On psychometric functions and integration of frequency information.
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DOI：
10.1121/10.0002668
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发表时间：
2020-11
期刊：
影响因子：
--
通讯作者：
Carlyon RP
中科院分区：
文献类型：
--
作者：
Gockel HE;Moore BCJ;Carlyon RP
Lau等人[Lau，Mehta和Oxenham（2017），J. Neuroscience，37，9013-9021]表明，对具有高频区域分量的复杂音调的基频（F0）的区分比从来自各个谐波的信息的最佳组合预测的要好。预测依赖于这样一个假设，即频率辨别的心理测量函数在高频处的斜率为1。这是通过测量心理功能F0的歧视和频率歧视。还测量了每个频率分量的F0差异阈值（F0 DLs）和频率差异阈值（FDLs）。复音包含6-10次谐波，F0为280或1400 Hz。使用双耳阈值均衡噪声（TEN）中双耳呈现的210-ms音调和双耳双耳TEN中双耳呈现的1000-ms音调来测量双耳阈值。所有频率和F0的心理测量函数的斜率均接近1。对于两个F0，预测F0 DL与观察到的F0 DL的比值约为1或更小，即不是超优的，并且对于低F0显著小于高F0。这一结果与位置信息本身就能表达基音的观点一致，但当相位锁定信息存在时，基音更为显著。
Lau et al. [Lau, Mehta, and Oxenham (2017), J. Neuroscience, 37, 9013-9021] showed that discrimination of the fundamental frequency (F0) of complex tones with components in a high frequency region was better than predicted from the optimal combination of information from the individual harmonics. The predictions depend on the assumption that psychometric functions for frequency discrimination have a slope of 1 at high frequencies. This was tested by measuring psychometric functions for F0 discrimination and frequency discrimination. Difference limens for F0 (F0DLs) and difference limens for frequency (FDLs) for each frequency component were also measured. Complex tones contained harmonics 6-10 and had F0s of 280 or 1400 Hz. Thresholds were measured using 210-ms tones presented diotically in diotic threshold-equalizing noise (TEN) and 1000-ms tones presented diotically in dichotic TEN. The slopes of the psychometric functions were close to 1 for all frequencies and F0s. The ratio of predicted to observed F0DLs was around 1 or smaller for both F0s, i.e. not super-optimal, and was significantly smaller for the low than for the high F0. The results are consistent with the idea that place information alone can convey pitch, but pitch is more salient when phase locking-information is available.
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