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Bilateral human laryngeal motor cortex in perceptual decision of lexical tone and voicing of consonant

Author

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  • Baishen Liang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yanchang Li

    (Chinese Academy of Sciences)

  • Wanying Zhao

    (Chinese Academy of Sciences)

  • Yi Du

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    CAS Center for Excellence in Brain Science and Intelligence Technology
    Chinese Institute for Brain Research)

Abstract

Speech perception is believed to recruit the left motor cortex. However, the exact role of the laryngeal subregion and its right counterpart in speech perception, as well as their temporal patterns of involvement remain unclear. To address these questions, we conducted a hypothesis-driven study, utilizing transcranial magnetic stimulation on the left or right dorsal laryngeal motor cortex (dLMC) when participants performed perceptual decision on Mandarin lexical tone or consonant (voicing contrast) presented with or without noise. We used psychometric function and hierarchical drift-diffusion model to disentangle perceptual sensitivity and dynamic decision-making parameters. Results showed that bilateral dLMCs were engaged with effector specificity, and this engagement was left-lateralized with right upregulation in noise. Furthermore, the dLMC contributed to various decision stages depending on the hemisphere and task difficulty. These findings substantially advance our understanding of the hemispherical lateralization and temporal dynamics of bilateral dLMC in sensorimotor integration during speech perceptual decision-making.

Suggested Citation

  • Baishen Liang & Yanchang Li & Wanying Zhao & Yi Du, 2023. "Bilateral human laryngeal motor cortex in perceptual decision of lexical tone and voicing of consonant," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40445-0
    DOI: 10.1038/s41467-023-40445-0
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    References listed on IDEAS

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    4. Adeen Flinker & Werner K. Doyle & Ashesh D. Mehta & Orrin Devinsky & David Poeppel, 2019. "Spectrotemporal modulation provides a unifying framework for auditory cortical asymmetries," Nature Human Behaviour, Nature, vol. 3(4), pages 393-405, April.
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