Lip movements entrain the observers’ low-frequency brain oscillations to facilitate speech intelligibility

Author:

Park Hyojin1ORCID,Kayser Christoph1ORCID,Thut Gregor1,Gross Joachim1ORCID

Affiliation:

1. Institute of Neuroscience and Psychology, University of Glasgow, Glasgow, United Kingdom

Abstract

During continuous speech, lip movements provide visual temporal signals that facilitate speech processing. Here, using MEG we directly investigated how these visual signals interact with rhythmic brain activity in participants listening to and seeing the speaker. First, we investigated coherence between oscillatory brain activity and speaker’s lip movements and demonstrated significant entrainment in visual cortex. We then used partial coherence to remove contributions of the coherent auditory speech signal from the lip-brain coherence. Comparing this synchronization between different attention conditions revealed that attending visual speech enhances the coherence between activity in visual cortex and the speaker’s lips. Further, we identified a significant partial coherence between left motor cortex and lip movements and this partial coherence directly predicted comprehension accuracy. Our results emphasize the importance of visually entrained and attention-modulated rhythmic brain activity for the enhancement of audiovisual speech processing.

Funder

Biotechnology and Biological Sciences Research Council

European Research Council

Wellcome Trust

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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