The neural correlate of speech rhythm as evidenced by metrical speech processing
The neural correlate of speech rhythm as evidenced by metrical speech processing
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DOI：
10.1162/jocn.2008.20029
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发表时间：
2008-03-01
影响因子：
3.2
通讯作者：
Meyer, Martin
中科院分区：
文献类型：
--
作者：
Geiser, Eveline;Zaehle, Tino;Meyer, Martin
本研究探讨了言语知觉中节奏加工的神经相关因素。德国伪句子说一个夸张的（iscoelasticity）或会话（nonisoelasticity）的节奏进行了比较，在听觉功能磁共振成像实验。受试者必须执行节奏任务（外显节奏处理）或韵律任务（内隐节奏处理）。该研究揭示了补充运动区（SMA）的双侧激活，延伸到扣带回，以及岛叶，延伸到右侧基底神经节（新纹状体），以及与节奏任务相关的右侧额下回（IFG）的活动。等长和不等长的句子之间的直接对比揭示了等长加工激活的偏侧化作为外显和内隐任务的函数的差异。外显处理显示激活在右后上级颞回（pSTG），右缘上回，和右顶叶盖。内隐处理显示激活左侧缘上回，左侧pSTG，和左侧顶叶盖。目前的结果表明，SMA的功能和超越电机定时和发言的听觉标记的时间间隔的感知这些脑区的作用。第二，这些数据说明了右IFG在重音模式加工中的特定任务相关功能。最后，数据支持的假设，即右侧次级听觉皮层参与听觉超分段线索的明确感知，而且，在右侧次级听觉皮层的活动可以由自上而下的处理机制调制。
The present study investigates the neural correlates of rhythm processing in speech perception. German pseudosentences spoken with an exaggerated (iscochronous) or a conversational (nonisochronous) rhythm were compared in an auditory functional magnetic resonance imaging experiment. The subjects had to perform either a rhythm task (explicit rhythm processing) or a prosody task (implicit rhythm processing). The study revealed bilateral activation in the supplementary motor area (SMA), extending into the cingulate gyrus, and in the insulae, extending into the right basal ganglia (neostriatum), as well as activity in the right inferior frontal gyrus (IFG) related to the performance of the rhythm task. A direct contrast between isochronous and nonisochronous sentences revealed differences in lateralization of activation for isochronous processing as a function of the explicit and implicit tasks. Explicit processing revealed activation in the right posterior superior temporal gyrus (pSTG), the right supramarginal gyrus, and the right parietal operculum. Implicit processing showed activation in the left supramarginal gyrus, the left pSTG, and the left parietal operculum. The present results indicate a function of the SMA and the insula beyond motor timing and speak for a role of these brain areas in the perception of acoustically marked temporal intervals. Secondly, the data speak for a specific task-related function of the right IFG in the processing of accent patterns. Finally, the data sustain the assumption that the right secondary auditory cortex is involved in the explicit perception of auditory suprasegmental cues and, moreover, that activity in the right secondary auditory cortex can be modulated by top-down processing mechanisms.