Early-latency categorical speech sound representations in the left inferior frontal gyrus.
Early-latency categorical speech sound representations in the left inferior frontal gyrus.
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DOI：
10.1016/j.neuroimage.2016.01.016
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发表时间：
2016-04-01
期刊：
影响因子：
5.7
通讯作者：
Jääskeläinen IP
中科院分区：
文献类型：
--
作者：
Alho J;Green BM;May PJC;Sams M;Tiitinen H;Rauschecker JP;Jääskeläinen IP
有效的语音感知需要将高度可变的声学信号映射到不同的语音类别。大脑如何克服这种多对一的映射问题仍未得到解决。为了推断人类大脑中分类语音表征的皮层位置、潜伏期和对注意的依赖性，我们测量了来自语音连续体的神经磁反应的刺激特异性适应。参与者在执行非语音听力任务时注意这些声音，而在单独的录音条件下，在观看无声电影时忽略这些声音。仅在注意状态下，左侧额下回的小包部（POp）存在音素类别选择性的神经适应，其选择性程度与被试对语音刺激的分类能力相关。重要的是，这些类别特异性表征在115-140 ms的早期延迟被激活，这与感知语音分类的速度是一致的。此外，在POp和后听觉皮质区之间观察到并发功能连接。这些新发现表明，当人类注意说话时，左POp通过背侧听觉流整合听觉和运动信息来调节语音分类。
Efficient speech perception requires the mapping of highly variable acoustic signals to distinct phonetic categories. How the brain overcomes this many-to-one mapping problem has remained unresolved. To infer the cortical location, latency, and dependency on attention of categorical speech sound representations in the human brain, we measured stimulus-specific adaptation of neuromagnetic responses to sounds from a phonetic continuum. The participants attended to the sounds while performing a non-phonetic listening task and, in a separate recording condition, ignored the sounds while watching a silent film. Neural adaptation indicative of phoneme category selectivity was found only during the attentive condition in the pars opercularis (POp) of the left inferior frontal gyrus, where the degree of selectivity correlated with the ability of the participants to categorize the phonetic stimuli. Importantly, these category-specific representations were activated at an early latency of 115–140 ms, which is compatible with the speed of perceptual phonetic categorization. Further, concurrent functional connectivity was observed between POp and posterior auditory cortical areas. These novel findings suggest that when humans attend to speech, the left POp mediates phonetic categorization through integration of auditory and motor information via the dorsal auditory stream.
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