Inferior frontal regions underlie the perception of phonetic category invariance.
Inferior frontal regions underlie the perception of phonetic category invariance.
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DOI：
10.1111/j.1467-9280.2009.02380.x
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发表时间：
2009-07
影响因子：
8.2
通讯作者：
Eliassen J
中科院分区：
文献类型：
--
作者：
Myers EB;Blumstein SE;Walsh E;Eliassen J
将不同的感官刺激映射到一个共同的类别是人类认知的基本问题。听者感知稳定的语音类别，尽管有许多声学变化的来源。目前的问题是如何识别这种感知稳定性背后的神经机制。采用短间隔习惯化fMRI范式研究语音范畴内和语音范畴之间的神经敏感性。左侧额下沟的一个区域显示出一种不变的激活模式：在对语音类别之间的变化敏感的背景下，对语音类别内的声学变化不敏感。相比之下，左侧颞上区对语音范畴内和语音范畴之间的变化表现出不同程度的敏感性。这些结果表明，对语音类别变化的感知不敏感可能是由左前额叶皮层的决策相关机制引起的，并且越来越多的文献表明，下前额叶皮层在计算类别表征方面起着域一般作用。
The problem of mapping differing sensory stimuli onto a common category is fundamental to human cognition. Listeners perceive stable phonetic categories despite many sources of acoustic variability. At issue is identifying those neural mechanisms underlying this perceptual stability. A short-interval habituation fMRI paradigm was used to investigate neural sensitivity to within and between phonetic category acoustic changes. A region in the left inferior frontal sulcus showed an invariant pattern of activation: insensitivity to acoustic changes within a phonetic category in the context of sensitivity to changes between phonetic categories. Left superior temporal regions, in contrast, showed graded sensitivity to both within- and between-phonetic category changes. These results suggest that perceptual insensitivity to changes within a phonetic category may arise from decision-related mechanisms in the left prefrontal cortex and add to a growing body of literature suggesting that the inferior prefrontal cortex plays a domain-general role in computing category representations.