Perception of complex sounds: N1 latency codes pitch and topography codes spectra
Perception of complex sounds: N1 latency codes pitch and topography codes spectra
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DOI：
10.1016/s1388-2457(00)00422-3
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发表时间：
2000-10-01
影响因子：
4.7
通讯作者：
Ragot, R
中科院分区：
文献类型：
--
作者：
Crottaz-Herbette, S;Ragot, R
目的：这项工作的目的是找出人类皮层的“tonotopy”是否代表了复杂声音的真正基频（Fo），或在音频频谱中谐波峰值的中心频率CF。事实上，复杂的周期性声音（如人声，乐器等）包括“基波分量”（Fo）及其“谐波”（2Fo、3Fo、. nFo）。这些通常在特定频率CF附近达到峰值。由于Fo和CF混淆在纯（正弦）音，无论是Fo或CF是通过tonotopy代表的问题迄今为止一直unsolved.Methods：全头记录的脑电活动，获得了16名受试者提交到一个阵列的9个不同的系列的声音（3 Fo × 3 CF）。电生理数据进行了分析，分别为每一个声音，每个主题与脑功能成像和偶极子reconstruction.Results：等效偶极子源的N1组件，显着为所有科目，越来越多的正面为CF增加，独立于Fo。结论：声音根据其谐波（CF）的频谱分布映射到右侧和左侧初级听觉皮层，而不是它们的基本频率（Fo）。(C)2000爱思唯尔科学爱尔兰有限公司保留所有权利。
Objectives: This work aimed to find out whether the human cortical 'tonotopy' represents the true fundamental frequency (Fo) of complex sounds, or the center frequency CF at which harmonics peak in the audio spectrum. Indeed, complex periodic sounds (such as those of the human voice, musical instruments, etc.) comprise a 'fundamental component' (Fo) and its 'harmonics' (2Fo, 3Fo,...nFo). These often peak around a certain frequency CF. As Fo and CF are confounded in pure (sinusoidal) tones, the question of whether Fo or CF is represented through tonotopy had been hitherto unresolved.Methods: Whole-head recordings of brain electrical activity were obtained for 16 subjects submitted to an array of 9 different series of sounds (3 Fo x 3 CF). Electrophysiological data were analyzed separately for each sound and each subject with brain functional imaging and dipole reconstruction.Results: Equivalent dipole sources of N1 components were, significantly for all subjects, more and more frontally oriented as CF increased, independently of Fo.Conclusions: Sounds are mapped in both the right and the left primary auditory cortices according to the spectral profiles of their harmonics (CF), rather than their fundamental frequencies (Fo). (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.