A mediating role of the auditory dorsal pathway in selective adaptation to speech: A state-dependent transcranial magnetic stimulation study
A mediating role of the auditory dorsal pathway in selective adaptation to speech: A state-dependent transcranial magnetic stimulation study
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DOI：
10.1016/j.brainres.2013.03.024
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发表时间：
2013-06-17
期刊：
影响因子：
2.9
通讯作者：
Sato, Marc
中科院分区：
文献类型：
--
作者：
Grabski, Krystyna;Tremblay, Pascale;Sato, Marc
除了感觉处理，最近的言语知觉神经生物学模型假设存在一个左听觉背侧处理流，连接听觉言语表征在听觉皮层与发音表示在运动系统中，通过感觉运动相互作用界面在缘上回和/或后部的上级颞回。本状态依赖经颅磁刺激研究的目的是确定是否语音识别确实是由听觉背侧通路介导的，通过检查的因果关系的贡献，左腹侧运动前皮层，缘上回和后部的上级颞回在听觉音节识别/分类任务。为了达到这个目的，参与者在进行两个强迫选择的听觉音节决策任务之前，先听一系列的/ba/音节（范围在/ba/和/da/之间的分类边界）。与以往的研究一致，选择性适应语音，适应/ba/，参与者的反应偏向/da/。相比之下，在没有先前的听觉适应的控制条件下，没有观察到这样的偏见。至关重要的是，与没有刺激时观察到的结果相比，在每个目标刺激开始时提供的单脉冲经颅磁刺激通过增强适应效应与每个受刺激大脑区域的初始状态相互作用。这些结果表明，听觉背侧通路有助于听觉言语适应。(C)2013爱思唯尔有限公司版权所有。
In addition to sensory processing, recent neurobiological models of speech perception postulate the existence of a left auditory dorsal processing stream, linking auditory speech representations in the auditory cortex with articulatory representations in the motor system, through sensorimotor interaction interfaced in the supramarginal gyrus and/or the posterior part of the superior temporal gyrus. The present state-dependent transcranial magnetic stimulation study is aimed at determining whether speech recognition is indeed mediated by the auditory dorsal pathway, by examining the causal contribution of the left ventral premotor cortex, supramarginal gyrus and posterior part of the superior temporal gyrus during an auditory syllable identification/categorization task. To this aim, participants listened to a sequence of /ba/ syllables before undergoing a two forced-choice auditory syllable decision task on ambiguous syllables (ranging in the categorical boundary between /ba/ and /da/). Consistent with previous studies on selective adaptation to speech, following adaptation to /ba/, participants responses were biased towards /da/. In contrast, in a control condition without prior auditory adaptation no such bias was observed. Crucially, compared to the results observed without stimulation, single-pulse transcranial magnetic stimulation delivered at the onset of each target stimulus interacted with the initial state of each of the stimulated brain area by enhancing the adaptation effect. These results demonstrate that the auditory dorsal pathway contribute to auditory speech adaptation. (C) 2013 Elsevier B.V. All rights reserved.