Organizing sound sequences in the human brain: the interplay of auditory streaming and temporal integration 1 1 Published on the World Wide Web on 27 February 2001.
Organizing sound sequences in the human brain: the interplay of auditory streaming and temporal integration 1 1 Published on the World Wide Web on 27 February 2001.
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DOI：
10.1016/s0006-8993(01)02224-7
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发表时间：
2001-04
期刊：
影响因子：
2.9
通讯作者：
H. Yabe;I. Winkler;I. Czigler;S. Koyama;R. Kakigi;T. Sutoh;T. Hiruma;S. Kaneko
中科院分区：
文献类型：
--
作者：
H. Yabe;I. Winkler;I. Czigler;S. Koyama;R. Kakigi;T. Sutoh;T. Hiruma;S. Kaneko
本研究探讨了两种早期大脑声音组织过程：听觉流和时间整合窗口（TWI）之间的关系。以快速的刺激传输速率呈现，两个频率交替的音调被认为是不同的高、低声音流。然而，当两个声音在大约200毫秒的时间窗口内出现时，它们通常被处理为单个听觉事件。即使在没有集中注意力的情况下，流隔离和时间整合也会发生，正如它们对失配负性（MMN）事件相关电位的影响所表明的那样。本研究的目的是利用刺激-遗漏MMN范式来确定这两种健全组织过程之间的优先级。当从同质音调序列中省略一个刺激时，只有当异步分离连续音调的刺激开始时间小于170 ms时，才会引起MMN。这证明了TWI的作用。记录了在两个交替音调序列中出现的不频繁的刺激省略引起的脑磁反应。当交替音调形成单个流（两个音调之间没有或只有很小的频率间隔）时，磁性MMN会被音调遗漏引起，但当感知中出现单独的高低流（两个交替音调之间有很大的频率间隔）时，则不会。这一结果表明，听觉流优先于时间整合过程。
The present study examined the relationship between two of the early brain processes of sound organization: auditory streaming and the temporal window of integration (TWI). Presented at a fast stimulus delivery rate, two tones alternating in frequency are perceived as separate streams of high and low sounds. However, when two sounds are presented within a ca. 200 ms temporal window, they are often processed as a single auditory event. Both stream segregation and temporal integration occur even in the absence of focused attention as was shown by their effect on the mismatch negativity (MMN) event-related potential. The goal of the present study was to determine the precedence between these two sound organization processes by using the stimulus-omission MMN paradigm. Infrequently omitting one stimulus from a homogeneous tone sequence only elicits an MMN when the stimulus onset asynchrony separating successive tones is shorter than 170 ms. This demonstrates the effect of the TWI. Magnetic brain responses elicited by infrequent stimulus omissions appearing in a sequence of two alternating tones were recorded. The magnetic MMN was elicited by tone omission when the alternating tones formed a single stream (with no or only small frequency separation between the two tones) but not when separate high and low streams emerged in perception (large frequency separation between the two alternating tones). This result shows that auditory streaming takes precedence over the processes of temporal integration.