Document Detail

Spatial variations of visual-auditory fusion areas.
MedLine Citation:
PMID:  14700258     Owner:  NLM     Status:  MEDLINE    
The tolerance to spatial disparity between two synchronous visual and auditory components of a bimodal stimulus has been investigated in order to assess their respective contributions to perceptual fusion. The visual and auditory systems each have specific information-processing mechanisms, and provide different cues for scene perception, with the respective dominance of space for vision and of time for hearing. A broadband noise burst and a spot of light, 500 ms in duration, have been simultaneously presented to participants who had to judge whether these cues referred to a single spatial event. We examined the influence of (i) the range and the direction of spatial disparity between the visual and auditory components of a stimulation and (ii) the eccentricity of the bimodal stimulus in the observer's perceptual field. Size and shape properties of visual-auditory fusion areas have been determined in two dimensions. The greater the eccentricity within the perceptual field, the greater the dimension of these areas; however, this increase in size also depends on whether the direction of the disparity is vertical or horizontal. Furthermore, the relative location of visual and auditory signals significantly modifies the perception of unity in the vertical plane. The shape of the fusion areas, their variation in the field, and the perceptual result associated with the relative location of the visual and auditory components of the stimulus, concur towards a strong contribution of audition to visual-auditory fusion. The spatial ambiguity of the localisation capabilities of the auditory system may play a more essential role than accurate visual resolution in determining fusion.
Martine Godfroy; Corinne Roumes; Pierre Dauchy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception     Volume:  32     ISSN:  0301-0066     ISO Abbreviation:  Perception     Publication Date:  2003  
Date Detail:
Created Date:  2003-12-31     Completed Date:  2004-03-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372307     Medline TA:  Perception     Country:  England    
Other Details:
Languages:  eng     Pagination:  1233-45     Citation Subset:  IM    
Département de Sciences Cognitives, Institut de Médecine Aérospatiale du Service de Santé des Armées (IMASSA), BP 73, F 91223 Brétigny-sur-Orge, France.
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MeSH Terms
Auditory Perception / physiology*
Middle Aged
Visual Perception / physiology*

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