人类大脑皮层的音高区域主要对可分辨的谐波作出反应,并且位于前听觉皮层的特定音调拓扑区域中。

Cortical pitch regions in humans respond primarily to resolved harmonics and are located in specific tonotopic regions of anterior auditory cortex.

机构信息

McGovern Institute for Brain Research and Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.

出版信息

J Neurosci. 2013 Dec 11;33(50):19451-69. doi: 10.1523/JNEUROSCI.2880-13.2013.

Abstract

Pitch is a defining perceptual property of many real-world sounds, including music and speech. Classically, theories of pitch perception have differentiated between temporal and spectral cues. These cues are rendered distinct by the frequency resolution of the ear, such that some frequencies produce "resolved" peaks of excitation in the cochlea, whereas others are "unresolved," providing a pitch cue only via their temporal fluctuations. Despite longstanding interest, the neural structures that process pitch, and their relationship to these cues, have remained controversial. Here, using fMRI in humans, we report the following: (1) consistent with previous reports, all subjects exhibited pitch-sensitive cortical regions that responded substantially more to harmonic tones than frequency-matched noise; (2) the response of these regions was mainly driven by spectrally resolved harmonics, although they also exhibited a weak but consistent response to unresolved harmonics relative to noise; (3) the response of pitch-sensitive regions to a parametric manipulation of resolvability tracked psychophysical discrimination thresholds for the same stimuli; and (4) pitch-sensitive regions were localized to specific tonotopic regions of anterior auditory cortex, extending from a low-frequency region of primary auditory cortex into a more anterior and less frequency-selective region of nonprimary auditory cortex. These results demonstrate that cortical pitch responses are located in a stereotyped region of anterior auditory cortex and are predominantly driven by resolved frequency components in a way that mirrors behavior.

摘要

音高是许多现实世界声音(包括音乐和语音)的一个决定性感知属性。传统上,音高感知理论将时间和频谱线索区分开来。这些线索由耳朵的频率分辨率来区分,使得一些频率在耳蜗中产生“可分辨”的兴奋峰,而其他频率则“不可分辨”,仅通过其时间波动提供音高线索。尽管人们长期以来一直对此感兴趣,但处理音高的神经结构及其与这些线索的关系仍存在争议。在这里,我们使用 fMRI 技术在人类中报告如下:(1)与之前的报告一致,所有受试者都表现出对谐波音调敏感的皮质区域,这些区域对谐波音调的反应明显强于频率匹配的噪声;(2)这些区域的反应主要由可分辨的频谱谐波驱动,尽管它们对不可分辨的谐波相对于噪声也表现出微弱但一致的反应;(3)对可分辨性的参数操纵的皮质敏感区域的反应与相同刺激的心理物理辨别阈值相吻合;(4)对音调敏感的区域定位于前听觉皮层的特定音区,从前听觉皮层的低频区域延伸到非主要听觉皮层的更前和频率选择较弱的区域。这些结果表明,皮质音高反应位于前听觉皮层的一个刻板区域,主要由可分辨的频率成分驱动,其方式与行为相吻合。

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