Gross, J. , Hoogenboom, N., Thut, G. , Schyns, P. , Panzeri, S., Belin, P. and Garrod, S. (2013) Speech rhythms and multiplexed oscillatory sensory coding in the human brain. PLoS Biology, 11(12), e1001752. (doi: 10.1371/journal.pbio.1001752)
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Publisher's URL: http://dx.doi.org/10.1371/journal.pbio.1001752
Abstract
Cortical oscillations are likely candidates for segmentation and coding of continuous speech. Here, we monitored continuous speech processing with magnetoencephalography (MEG) to unravel the principles of speech segmentation and coding. We demonstrate that speech entrains the phase of low-frequency (delta, theta) and the amplitude of high-frequency (gamma) oscillations in the auditory cortex. Phase entrainment is stronger in the right and amplitude entrainment is stronger in the left auditory cortex. Furthermore, edges in the speech envelope phase reset auditory cortex oscillations thereby enhancing their entrainment to speech. This mechanism adapts to the changing physical features of the speech envelope and enables efficient, stimulus-specific speech sampling. Finally, we show that within the auditory cortex, coupling between delta, theta, and gamma oscillations increases following speech edges. Importantly, all couplings (i.e., brain-speech and also within the cortex) attenuate for backward-presented speech, suggesting top-down control. We conclude that segmentation and coding of speech relies on a nested hierarchy of entrained cortical oscillations.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Hoogenboom, Dr Nienke and Panzeri, Professor Stefano and Belin, Professor Pascal and Garrod, Professor Simon and Schyns, Professor Philippe and Thut, Professor Gregor and Gross, Professor Joachim |
Authors: | Gross, J., Hoogenboom, N., Thut, G., Schyns, P., Panzeri, S., Belin, P., and Garrod, S. |
College/School: | College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience |
Journal Name: | PLoS Biology |
Publisher: | Public Library of Science |
ISSN: | 1544-9173 |
ISSN (Online): | 1544-9173 |
Copyright Holders: | Copyright © 2013 The Authors |
First Published: | First published in PLoS Biology 11(12):e1001752 |
Publisher Policy: | Reproduced under a Creative Commons License |
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