Document Detail


Lipreading and covert speech production similarly modulate human auditory-cortex responses to pure tones.
MedLine Citation:
PMID:  20107058     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Watching the lips of a speaker enhances speech perception. At the same time, the 100 ms response to speech sounds is suppressed in the observer's auditory cortex. Here, we used whole-scalp 306-channel magnetoencephalography (MEG) to study whether lipreading modulates human auditory processing already at the level of the most elementary sound features, i.e., pure tones. We further envisioned the temporal dynamics of the suppression to tell whether the effect is driven by top-down influences. Nineteen subjects were presented with 50 ms tones spanning six octaves (125-8000 Hz) (1) during "lipreading," i.e., when they watched video clips of silent articulations of Finnish vowels /a/, /i/, /o/, and /y/, and reacted to vowels presented twice in a row; (2) during a visual control task; (3) during a still-face passive control condition; and (4) in a separate experiment with a subset of nine subjects, during covert production of the same vowels. Auditory-cortex 100 ms responses (N100m) were equally suppressed in the lipreading and covert-speech-production tasks compared with the visual control and baseline tasks; the effects involved all frequencies and were most prominent in the left hemisphere. Responses to tones presented at different times with respect to the onset of the visual articulation showed significantly increased N100m suppression immediately after the articulatory gesture. These findings suggest that the lipreading-related suppression in the auditory cortex is caused by top-down influences, possibly by an efference copy from the speech-production system, generated during both own speech and lipreading.
Authors:
Jaakko Kauramäki; Iiro P Jääskeläinen; Riitta Hari; Riikka Möttönen; Josef P Rauschecker; Mikko Sams
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of neuroscience : the official journal of the Society for Neuroscience     Volume:  30     ISSN:  1529-2401     ISO Abbreviation:  J. Neurosci.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-01-28     Completed Date:  2010-07-08     Revised Date:  2014-09-22    
Medline Journal Info:
Nlm Unique ID:  8102140     Medline TA:  J Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1314-21     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation
Adult
Auditory Cortex / physiology*
Auditory Pathways / physiology
Auditory Perception / physiology*
Brain Mapping
Evoked Potentials, Auditory / physiology
Female
Functional Laterality / physiology
Humans
Lipreading*
Magnetoencephalography
Male
Nerve Net / physiology
Neural Inhibition / physiology
Neuropsychological Tests
Perceptual Masking / physiology*
Photic Stimulation
Pitch Discrimination / physiology
Reaction Time / physiology
Speech Acoustics
Speech Perception / physiology*
Visual Perception / physiology*
Young Adult
Grant Support
ID/Acronym/Agency:
R01 DC003489/DC/NIDCD NIH HHS; R01 EY018923/EY/NEI NIH HHS; R01 EY018923-02/EY/NEI NIH HHS; R01 NS052494/NS/NINDS NIH HHS; R01 NS052494/NS/NINDS NIH HHS; R01 NS052494-02/NS/NINDS NIH HHS; RC1 DC010720/DC/NIDCD NIH HHS; RC1 DC010720-02/DC/NIDCD NIH HHS
Comments/Corrections

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