Representation of speech categories in the primate auditory cortex.
Representation of speech categories in the primate auditory cortex.
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DOI：
10.1152/jn.00037.2011
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发表时间：
2011-02
影响因子：
2.5
通讯作者：
Joji Tsunada;J. H. Lee;Y. Cohen
中科院分区：
文献类型：
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作者：
Joji Tsunada;J. H. Lee;Y. Cohen
非人类灵长类动物的“腹侧”听觉通路起源于核心听觉皮层，终止于前额叶皮层，被认为参与了非空间听觉处理的组成部分。我们实验室以前的工作表明，前额叶皮层的神经元反映了猴子在分类判断中的决定。在这里，我们测试的作用，上级颞回（STG），一个区域的次级听觉皮层，这是腹侧通路的一部分，在类似的分类判断。虽然猴子参加了一个匹配到类别的任务，并报告是否两个连续的听觉刺激属于同一类别或不同的类别，我们记录的尖峰活动STG神经元。听觉刺激是两种人类语音（坏和爸爸）的变体。我们发现，STG神经元代表听觉类别。然而，与前额叶皮层的活动不同，STG活动不受猴子行为报告（选择）的调节。这一发现是一致的前外侧STG的功能电路的一部分，参与编码，代表性和感知的非空间功能的听觉刺激的作用。
A "ventral" auditory pathway in nonhuman primates that originates in the core auditory cortex and ends in the prefrontal cortex is thought to be involved in components of nonspatial auditory processing. Previous work from our laboratory has indicated that neurons in the prefrontal cortex reflect monkeys' decisions during categorical judgments. Here, we tested the role of the superior temporal gyrus (STG), a region of the secondary auditory cortex that is part of this ventral pathway, during similar categorical judgments. While monkeys participated in a match-to-category task and reported whether two consecutive auditory stimuli belonged to the same category or to different categories, we recorded spiking activity from STG neurons. The auditory stimuli were morphs of two human-speech sounds (bad and dad). We found that STG neurons represented auditory categories. However, unlike activity in the prefrontal cortex, STG activity was not modulated by the monkeys' behavioral reports (choices). This finding is consistent with the anterolateral STG's role as a part of functional circuit involved in the coding, representation, and perception of the nonspatial features of an auditory stimulus.