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Neurophysiological origin of human brain asymmetry for speech and language.

Abstract : The physiological basis of human cerebral asymmetry for language remains mysterious. We have used simultaneous physiological and anatomical measurements to investigate the issue. Concentrating on neural oscillatory activity in speech-specific frequency bands and exploring interactions between gestural (motor) and auditory-evoked activity, we find, in the absence of language-related processing, that left auditory, somatosensory, articulatory motor, and inferior parietal cortices show specific, lateralized, speech-related physiological properties. With the addition of ecologically valid audiovisual stimulation, activity in auditory cortex synchronizes with left-dominant input from the motor cortex at frequencies corresponding to syllabic, but not phonemic, speech rhythms. Our results support theories of language lateralization that posit a major role for intrinsic, hardwired perceptuomotor processing in syllabic parsing and are compatible both with the evolutionary view that speech arose from a combination of syllable-sized vocalizations and meaningful hand gestures and with developmental observations suggesting phonemic analysis is a developmentally acquired process.
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https://hal.inria.fr/hal-00795772
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Submitted on : Thursday, February 28, 2013 - 7:55:42 PM
Last modification on : Friday, July 2, 2021 - 3:39:36 AM

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Benjamin Morillon, Katia Lehongre, Richard S J Frackowiak, Antoine Ducorps, Andreas Kleinschmidt, et al.. Neurophysiological origin of human brain asymmetry for speech and language.. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2010, 107 (43), pp.18688-93. ⟨10.1073/pnas.1007189107⟩. ⟨hal-00795772⟩

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