Speech rhythms and multiplexed oscillatory sensory coding in the human brain

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
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hoogenboom, Dr Nienke and Panzeri, Professor Stefano and Schyns, Professor Philippe and Belin, Professor Pascal and Thut, Professor Gregor and Gross, Professor Joachim and Garrod, Professor Simon
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 > Institute of Neuroscience and Psychology
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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
536511Neural mechanisms of sensory awarenessJoachim GrossWellcome Trust (WELLCOME)091928/Z/10/ZRI NEUROSCIENCE & PSYCHOLOGY
597911Natural and modulated neural communication: State-dependent decoding and driving of human Brain OscillationsGregor ThutWellcome Trust (WELLCOME)098434/Z/12/ZINP - CENTRE FOR COGNITIVE NEUROIMAGING
597051Natural and modulated neural communication: State-dependent decoding and driving of human Brain Oscillations.Joachim GrossWellcome Trust (WELLCOME)098433/Z/12/ZINP - CENTRE FOR COGNITIVE NEUROIMAGING