The analysis of speech in different temporal integration windows: cerebral lateralization as 'asymmetric sampling in time'
The analysis of speech in different temporal integration windows: cerebral lateralization as 'asymmetric sampling in time'
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DOI：
10.1016/s0167-6393(02)00107-3
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发表时间：
2003-08-01
影响因子：
3.2
通讯作者：
Poeppel, D
中科院分区：
文献类型：
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作者：
Poeppel, D
在这里开发的“非对称采样时间”（AST）的假设提供了一个框架，以了解一系列的心理物理和神经心理学数据的语音感知的背景下，修订的皮层功能解剖模型。AST模型的动机是来自心理物理学和认知神经科学的观察，这些观察一般涉及听觉处理的分级，特别是言语感知。基于以下观察结果：（1）语音信号包含多个与听觉认知相关的时间尺度（例如，与处理共振峰转换相称的时间尺度与与音节和语调轮廓相称的时间尺度），以及（2）语音感知由左右听觉皮层介导，AST提出了一种基于时间的观点，该观点保持了解剖对称性，同时允许功能不对称性。AST提出，输入语音信号具有在早期表征水平上双侧对称的神经表征。然而，除了初始表示之外，信号在时域中是不对称的：左侧听觉区域优先从短（类似于20 -40 ms）时间积分窗口中提取信息。右半球同源体优先从长的整合窗口（类似于150 -250 ms）提取信息。有人建议，时间整合反映为振荡神经元活动在不同的频带（γ，θ）。(C)2002 Elsevier Science B. V.保留所有权利。
The 'asymmetric sampling in time' (AST) hypothesis developed here provides a framework for understanding a range of psychophysical and neuropsychological data on speech perception in the context of a revised cortical functional anatomic model. The AST model is motivated by observations from psychophysics and cognitive neuroscience that speak to the fractionation of auditory processing, in general, and speech perception, in particular. Building on the observations (1) that the speech signal contains more than one time scale relevant to auditory cognition (e.g. time scales commensurate with processing formant transitions versus scales commensurate with syllabicity and intonation contours), and (2) that speech perception is mediated by both left and right auditory cortices, AST suggests a time-based perspective that maintains anatomic symmetry while permitting functional asymmetry. AST proposes that the input speech signal has a neural representation that is bilaterally symmetric at an early representational level. Beyond the initial representation, however, the signal is elaborated asymmetrically in the time domain: left auditory areas preferentially extract information from short (similar to20-40 ms) temporal integration windows. The right hemisphere homologues preferentially extract information from long (similar to150-250 ms) integration windows. It is suggested that temporal integration is reflected as oscillatory neuronal activity in different frequency bands (gamma, theta). (C) 2002 Elsevier Science B.V. All rights reserved.