Document Detail


Inverse effectiveness and multisensory interactions in visual event-related potentials with audiovisual speech.
MedLine Citation:
PMID:  22367585     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In recent years, it has become evident that neural responses previously considered to be unisensory can be modulated by sensory input from other modalities. In this regard, visual neural activity elicited to viewing a face is strongly influenced by concurrent incoming auditory information, particularly speech. Here, we applied an additive-factors paradigm aimed at quantifying the impact that auditory speech has on visual event-related potentials (ERPs) elicited to visual speech. These multisensory interactions were measured across parametrically varied stimulus salience, quantified in terms of signal to noise, to provide novel insights into the neural mechanisms of audiovisual speech perception. First, we measured a monotonic increase of the amplitude of the visual P1-N1-P2 ERP complex during a spoken-word recognition task with increases in stimulus salience. ERP component amplitudes varied directly with stimulus salience for visual, audiovisual, and summed unisensory recordings. Second, we measured changes in multisensory gain across salience levels. During audiovisual speech, the P1 and P1-N1 components exhibited less multisensory gain relative to the summed unisensory components with reduced salience, while N1-P2 amplitude exhibited greater multisensory gain as salience was reduced, consistent with the principle of inverse effectiveness. The amplitude interactions were correlated with behavioral measures of multisensory gain across salience levels as measured by response times, suggesting that change in multisensory gain associated with unisensory salience modulations reflects an increased efficiency of visual speech processing.
Authors:
Ryan A Stevenson; Maxim Bushmakin; Sunah Kim; Mark T Wallace; Aina Puce; Thomas W James
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Publication Detail:
Type:  Journal Article     Date:  2012-02-25
Journal Detail:
Title:  Brain topography     Volume:  25     ISSN:  1573-6792     ISO Abbreviation:  Brain Topogr     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-05-30     Completed Date:  2012-10-10     Revised Date:  2014-09-19    
Medline Journal Info:
Nlm Unique ID:  8903034     Medline TA:  Brain Topogr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  308-26     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation*
Adolescent
Adult
Auditory Perception / physiology*
Electroencephalography
Evoked Potentials, Visual / physiology*
Female
Humans
Male
Photic Stimulation*
Reaction Time
Speech Perception / physiology*
Visual Perception / physiology*
Grant Support
ID/Acronym/Agency:
F32 DC011993/DC/NIDCD NIH HHS; R01 MH063861/MH/NIMH NIH HHS; R34 DC010927/DC/NIDCD NIH HHS; T32 DC000012/DC/NIDCD NIH HHS
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