Audiovisual contrast enhancement is articulated primarily via the M-pathway

Although it has been previously reported that audiovisual integration can modulate performance on some visual tasks, multisensory interactions have not been explicitly assessed in the context of different visual processing pathways. In the present study, we test auditory influences on visual process...

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Vydáno v:	Brain research Ročník 1366; s. 85 - 92
Hlavní autoři:	Jaekl, Philip M., Soto-Faraco, Salvador
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Amsterdam Elsevier B.V 17.12.2010 Elsevier
Témata:	Acoustic Stimulation Adult Analysis of Variance Anatomical correlates of behavior Attention - physiology Audiovisual Behavioral psychophysiology Biological and medical sciences Contrast sensitivity Contrast Sensitivity - physiology Detection Eye and associated structures. Visual pathways and centers. Vision Female Fundamental and applied biological sciences. Psychology Humans Magnocellular pathway Male Multisensory Neurology Orientation - physiology Parvocellular pathway Perceptual enhancement Photic Stimulation Psychology. Psychoanalysis. Psychiatry Psychology. Psychophysiology Psychophysics Reaction Time - physiology Sensory Thresholds - physiology Sound Vertebrates: nervous system and sense organs Visual Pathways - physiology Young Adult Audiovisual Magnocellular pathway Contrast sensitivity Parvocellular pathway Detection Perceptual enhancement Multisensory Human Multisensory integration Medical screening Contrast Sensitivity Visual pathway Intermodal perception
ISSN:	0006-8993, 1872-6240, 1872-6240
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Shrnutí:	Although it has been previously reported that audiovisual integration can modulate performance on some visual tasks, multisensory interactions have not been explicitly assessed in the context of different visual processing pathways. In the present study, we test auditory influences on visual processing employing a psychophysical paradigm that reveals distinct spatial contrast signatures of magnocellular and parvocellular visual pathways. We found that contrast thresholds are reduced when noninformative sounds are presented with transient, low-frequency Gabor patch stimuli and thus favor the M-system. In contrast, visual thresholds are unaffected by concurrent sounds when detection is primarily attributed to P-pathway processing. These results demonstrate that the visual detection enhancement resulting from multisensory integration is mainly articulated by the magnocellular system, which is most sensitive at low spatial frequencies. Such enhancement may subserve stimulus-driven processes including the orientation of spatial attention and fast, automatic ocular and motor responses. This dissociation helps explain discrepancies between the results of previous studies investigating visual enhancement by sounds. ►Audiovisual sensory interaction can increase visual contrast sensitivity. ►Audiovisual contrast enhancement is dependent on spatial frequency tuning. ►Enhancement occurs for visual stimuli more sensitive to the magnocellular system and not with stimuli tuned primarily to parvocellular processing channels.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0006-8993 1872-6240 1872-6240
DOI:	10.1016/j.brainres.2010.10.012