Transformation of a temporal speech cue to a spatial neural code in human auditory cortex

被引:14
作者
Fox, Neal P. [1 ]
Leonard, Matthew [1 ]
Sjerps, Matthias J. [2 ,3 ]
Chang, Edward F. [1 ,4 ]
机构
[1] Univ Calif San Francisco, Dept Neurol Surg, San Francisco, CA 94143 USA
[2] Radboud Univ Nijmegen, Ctr Cognit Neuroimaging, Donders Inst Brain Cognit & Behav, Nijmegen, Netherlands
[3] Max Planck Inst Psycholinguist, Nijmegen, Netherlands
[4] Univ Calif San Francisco, Weill Inst Neurosci, San Francisco, CA 94143 USA
来源
ELIFE | 2020年 / 9卷
基金
美国国家卫生研究院;
关键词
VOICE-ONSET TIME; LOCAL-FIELD POTENTIALS; SPEAKING RATE; INTERACTIVE ACTIVATION; CATEGORICAL PERCEPTION; RESPONSES; INFORMATION; DISCRIMINATION; REPRESENTATION; MODEL;
D O I
10.7554/eLife.53051
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
In speech, listeners extract continuously-varying spectrotemporal cues from the acoustic signal to perceive discrete phonetic categories. Spectral cues are spatially encoded in the amplitude of responses in phonetically-tuned neural populations in auditory cortex. It remains unknown whether similar neurophysiological mechanisms encode temporal cues like voice-onset time (VOT), which distinguishes sounds like /b/ and/p/. We used direct brain recordings in humans to investigate the neural encoding of temporal speech cues with a VOT continuum from /ba/ to / pa/. We found that distinct neural populations respond preferentially to VOTs from one phonetic category, and are also sensitive to sub-phonetic VOT differences within a population's preferred category. In a simple neural network model, simulated populations tuned to detect either temporal gaps or coincidences between spectral cues captured encoding patterns observed in real neural data. These results demonstrate that a spatial/amplitude neural code underlies the cortical representation of both spectral and temporal speech cues.
引用
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页数:28
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