Cortical processing of change in sound location: Smooth motion versus discontinuous displacement
Cortical processing of change in sound location: Smooth motion versus discontinuous displacement
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DOI：
10.1016/j.brainres.2012.05.033
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发表时间：
2012-07-23
期刊：
影响因子：
2.9
通讯作者：
Lewald, Joerg
中科院分区：
文献类型：
--
作者：
Getzmann, Stephan;Lewald, Joerg
对空间变化的检测是对听觉环境的动态方面做出充分反应的基本前提，无论是由平稳运动还是持续声源的突然和不连续的位移引起的。在这里，我们使用脑电技术研究了不同类型空间变化的听觉处理。在注视正前方时，受试者会听到一个自由场的声音刺激，在中央位置的初始静止阶段后，(1)开始水平移动(运动刺激)，或(2)在左右半空间内以随机顺序重复改变其空间位置(分散刺激)，或(3)突然向侧向位置移动(位移刺激)。无论刺激类型如何，空间变化的开始都会引发一个特征序列的听觉诱发电位，该序列类似于先前研究中描述的所谓的运动开始反应。对不同刺激类型的反应幅度和潜伏期的差异只是渐进的，散布和位移通常比运动产生更强的反应。此外，大脑半球间对散射反应的不对称模式与其他类型的位置变化的反应略有不同。这些发现并不是任何实质性的刺激特定差异，而是表明存在听觉“空间变化反应”，即对环境中任何不一定需要涉及运动的空间变化进行听觉处理的共同电生理学关联。(C)2012爱思唯尔B.V.保留所有权利。
The detection of a change in space is an essential prerequisite of adequate responding to dynamic aspects of our auditory environment, be it induced by smooth motion or abrupt and discontinuous displacements of ongoing sound sources. Here, we investigated the auditory processing of different types of spatial change using electroencephalography. While fixating straight ahead, participants listened to a free-field sound stimulus that, after an initial stationary phase in a central position, either (1) started to move horizontally (motion stimulus), or (2) changed repetitively its spatial position in random order within left or right hemispaces (scatter stimulus), or (3) shifted abruptly toward a lateral position (displacement stimulus). Irrespective of stimulus type, the onset of spatial change elicited a characteristic sequence of auditory evoked potentials that was similar to the so-called motion-onset response described in previous studies. Differences in response amplitudes and latencies to the different stimulus types were only gradual, with scatter and displacement producing generally stronger responses than motion. Also, inter-hemispheric asymmetry patterns in the responses to scatter differed somewhat from those obtained with the other types of changes in position. Rather than any substantial stimulus-specific differences, the findings suggest the existence of an auditory "spatial change response," that is, a common electrophysiological correlate of auditory processing of any spatial change in the environment that does not necessarily need to involve motion as such. (c) 2012 Elsevier B.V. All rights reserved.