Processing of Auditory Location Changes after Horizontal Head Rotation
Processing of Auditory Location Changes after Horizontal Head Rotation
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DOI：
10.1523/jneurosci.1708-09.2009
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发表时间：
2009-10-14
影响因子：
5.3
通讯作者：
Kaiser, Jochen
中科院分区：
文献类型：
--
作者：
Altmann, Christian F.;Wilczek, Esther;Kaiser, Jochen
在自然条件下，我们的声音定位能力使我们能够不断移动，同时保持对听觉环境的稳定表示。然而，由于大多数听觉研究集中在头部限制的条件下，它仍然不清楚是否听觉空间处理的神经生理学标记反映在一个以头部为中心的或allocentric坐标系的代表。因此，我们使用人类脑电图测试是否空间失配负波（MMN）作为空间变化处理的标记引起的声源位置的变化，在头部相关或allocentric坐标系。受试者听一系列几乎本地化的带通噪音音调，偶尔视觉提示进行水平头部运动。在这些头部运动之后，我们提出了以头部为中心或以非头部为中心的坐标系中的偏差。我们观察到显着的MMN反应的头部相关的偏差，但一个变化相关的新奇P3样组件的头部相关和allocentric偏差。因此，这些结果表明，空间MMN与听觉空间的表示在一个头部相关的坐标系，运动输出和听觉输入的整合可能发生在听觉“哪里”处理流的后期阶段。
Under natural conditions, our sound localization capabilities enable us to move constantly while keeping a stable representation of our auditory environment. However, since most auditory studies focus on head-restrained conditions, it is still unclear whether neurophysiological markers of auditory spatial processing reflect representation in a head-centered or an allocentric coordinate system. Therefore, we used human electroencephalography to test whether the spatial mismatch negativity (MMN) as a marker of spatial change processing is elicited by changes of sound source position in terms of a head-related or an allocentric coordinate system. Subjects listened to a series of virtually localized band-passed noise tones and were occasionally cued visually to conduct horizontal head movements. After these head movements, we presented deviants either in terms of a head-centered or an allocentric coordinate system. We observed significant MMN responses to the head-related deviants only but a change-related novelty P3-like component for both head-related and allocentric deviants. These results thus suggest that the spatial MMN is associated with a representation of auditory space in a head-related coordinate system and that the integration of motor output and auditory input possibly occurs at later stages of the auditory "where" processing stream.