Parietal disruption alters audiovisual binding in the sound-induced flash illusion

Kamke, Marc R., Vieth, Harrison E., Cottrell, David, and Mattingley, Jason B. (2012) Parietal disruption alters audiovisual binding in the sound-induced flash illusion. NeuroImage, 62 (3). pp. 1334-1341.

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Selective attention and multisensory integration are fundamental to perception, but little is known about whether, or under what circumstances, these processes interact to shape conscious awareness. Here, we used transcranial magnetic stimulation (TMS) to investigate the causal role of attention-related brain networks in multisensory integration between visual and auditory stimuli in the sound-induced flash illusion. The flash illusion is a widely studied multisensory phenomenon in which a single flash of light is falsely perceived as multiple flashes in the presence of irrelevant sounds. We investigated the hypothesis that extrastriate regions involved in selective attention, specifically within the right parietal cortex, exert an influence on the multisensory integrative processes that cause the flash illusion. We found that disruption of the right angular gyrus, but not of the adjacent supramarginal gyrus or of a sensory control site, enhanced participants' veridical perception of the multisensory events, thereby reducing their susceptibility to the illusion. Our findings suggest that the same parietal networks that normally act to enhance perception of attended events also play a role in the binding of auditory and visual stimuli in the sound-induced flash illusion.

Item ID: 22049
Item Type: Article (Research - C1)
ISSN: 1095-9572
Keywords: angular gyrus; flash illusion; multisensory integration; selective attention; transcranial magnetic stimulation
Date Deposited: 27 Jun 2012 05:47
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1109 Neurosciences > 110906 Sensory Systems @ 50%
17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170112 Sensory Processes, Perception and Performance @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970117 Expanding Knowledge in Psychology and Cognitive Sciences @ 100%
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