Pitch representations in the auditory nerve: two concurrent complex tones.
Pitch representations in the auditory nerve: two concurrent complex tones.
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DOI：
10.1152/jn.01361.2007
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发表时间：
2008-09
影响因子：
2.5
通讯作者：
Delgutte, Bertrand
中科院分区：
文献类型：
--
作者：
Larsen, Erik;Cedolin, Leonardo;Delgutte, Bertrand
并发声音之间的音高差异是听觉场景分析中使用的重要线索，在音乐感知中也起着重要作用。为了研究这些感知能力背后的神经编码，我们记录了猫听觉神经中单个纤维对两个同时存在的谐波复音的反应，这些谐波缺少基本谐波和等振幅谐波。我们研究了率位编码和峰间编码对两个音调的有效性，这两个音调的基频（F0）比率为15/14或11/9。我们依靠耳蜗力学中的尺度不变性原理，从单个纤维中作为F0函数的一系列测量中推断出对给定刺激的时空响应模式。利用外周听觉模型创建的模板，根据推断的发射率沿声位轴的分布来估计双复音的f0。这种率位表示对于900赫兹以上的F0s是准确的。令人惊讶的是，基于速率的F0估计是准确的，即使两种音调的混合物不包含分解谐波，只要一些谐波在混合之前被分解。我们还扩展了以前用于单个复杂音调的方法，以从音调轴上汇集的峰间间隔分布中估计并发复杂音调的f0。基于间隔的表示对于低于900 Hz的F0s是准确的，其中双音混合物不包含可分辨的谐波。总之，基于频率位置和间隔的表示允许在整个人声和猫的发声范围内对并发声音进行准确的音高感知。
Pitch differences between concurrent sounds are important cues used in auditory scene analysis and also play a major role in music perception. To investigate the neural codes underlying these perceptual abilities, we recorded from single fibers in the cat auditory nerve in response to two concurrent harmonic complex tones with missing fundamentals and equal-amplitude harmonics. We investigated the efficacy of rate-place and interspike-interval codes to represent both pitches of the two tones, which had fundamental frequency (F0) ratios of 15/14 or 11/9. We relied on the principle of scaling invariance in cochlear mechanics to infer the spatiotemporal response patterns to a given stimulus from a series of measurements made in a single fiber as a function of F0. Templates created by a peripheral auditory model were used to estimate the F0s of double complex tones from the inferred distribution of firing rate along the tonotopic axis. This rate-place representation was accurate for F0s above about 900 Hz. Surprisingly, rate-based F0 estimates were accurate even when the two-tone mixture contained no resolved harmonics, so long as some harmonics were resolved prior to mixing. We also extended methods used previously for single complex tones to estimate the F0s of concurrent complex tones from interspike-interval distributions pooled over the tonotopic axis. The interval-based representation was accurate for F0s below about 900 Hz, where the two-tone mixture contained no resolved harmonics. Together, the rate-place and interval-based representations allow accurate pitch perception for concurrent sounds over the entire range of human voice and cat vocalizations.
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