Frequency and periodicity are represented in orthogonal maps in the human auditory cortex: evidence from magnetoencephalography
Frequency and periodicity are represented in orthogonal maps in the human auditory cortex: evidence from magnetoencephalography
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DOI：
10.1007/s003590050148
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发表时间：
1997-12-01
影响因子：
2.1
通讯作者：
Schulze, H
中科院分区：
文献类型：
--
作者：
Langner, G;Sams, M;Schulze, H
音色和音高是声音的两个独立的感知品质，分别与频谱包络和周期性时间包络波动的基频密切相关。第一近似，频谱和时间调谐性能的神经元在听觉中脑的各种动物是独立的，这些调谐性能的布局在近似正交tonotopic和periodotopic地图。我们第一次证明通过脑磁图的人类听觉皮层的periodotopic组织和分析其空间关系的tonotopic组织通过使用一系列的刺激与不同的时间包络波动和频谱和磁力计提供高的空间分辨率。我们证明了一个正交的排列tonotopic和periodotopic梯度。我们的研究结果与动物中这种映射的组织一致，并且与人类中音色和音高的感知正交性密切匹配。
Timbre and pitch are two independent perceptual qualities of sounds closely related to the spectral envelope and to the fundamental frequency of periodic temporal envelope fluctuations, respectively. To a first approximation, the spectral and temporal tuning properties of neurons in the auditory midbrain of various animals are independent, with layouts of these tuning properties in approximately orthogonal tonotopic and periodotopic maps. For the first time we demonstrate by means of magnetoencephalography a periodotopic organization of the human auditory cortex and analyse its spatial relationship to the tonotopic organization by using a range of stimuli with different temporal envelope fluctuations and spectra and a magnetometer providing high spatial resolution. We demonstrate an orthogonal arrangement of tonotopic and periodotopic gradients. Our results are in line with the organization of such maps in animals and closely match the perceptual orthogonality of timbre and pitch in humans.