Cooperative cortical network for categorical processing of Chinese lexical tone

Proceedings of the National Academy of Sciences of the United States of America
Xiaopeng SiBo Hong

Abstract

In tonal languages such as Chinese, lexical tone with varying pitch contours serves as a key feature to provide contrast in word meaning. Similar to phoneme processing, behavioral studies have suggested that Chinese tone is categorically perceived. However, its underlying neural mechanism remains poorly understood. By conducting cortical surface recordings in surgical patients, we revealed a cooperative cortical network along with its dynamics responsible for this categorical perception. Based on an oddball paradigm, we found amplified neural dissimilarity between cross-category tone pairs, rather than between within-category tone pairs, over cortical sites covering both the ventral and dorsal streams of speech processing. The bilateral superior temporal gyrus (STG) and the middle temporal gyrus (MTG) exhibited increased response latencies and enlarged neural dissimilarity, suggesting a ventral hierarchy that gradually differentiates the acoustic features of lexical tones. In addition, the bilateral motor cortices were also found to be involved in categorical processing, interacting with both the STG and the MTG and exhibiting a response latency in between. Moreover, the motor cortex received enhanced Granger causal influence f...Continue Reading

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Citations

Aug 24, 2018·Cerebral Cortex·Jingwei ShengJia-Hong Gao
Jan 11, 2020·Frontiers in Psychology·Xiang GaoYu-Xuan Zhang
Feb 21, 2021·Nature Communications·Yuanning LiEdward F Chang
Mar 27, 2021·The Journal of the Acoustical Society of America·Md Sultan MahmudGavin M Bidelman

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Software Mentioned

GCCA
Psychophysics Toolbox
Granger Causal Connectivity Analysis ( GCCA ) Toolbox
Praat
MATLAB

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