Spatial congruency and the sound-induced flash illusion

Cottrell, David, Prescott, John, and Purves, Collette (2007) Spatial congruency and the sound-induced flash illusion. In: Paper presented at 8th Annual Meeting of the International Multisensory Research Forum, p. 43. From: IMRF2007: 8th Annual Meeting of the International Multisensory Research Forum, 5-7 July 2007, Sydney, NSW, Australia.

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Abstract

A single brief visual stimulus when accompanied by multiple beeps is perceived as multiple flashes (Shams et al, 2000). This sound induced flash illusion is thus an interesting example of the modification of the perception of an unambiguous visual stimulus by an auditory stimulus. The temporal properties of the illusion are well documented with the illusion remaining strong as long as all the stimuli occur within a temporal window of approximately 70ms. Other psychophysical limits to the effect are less well known. Based on the assumption that sensory integration is maximised when the stimuli occur together in both time and space, we predicted that the illusion would be sensitive to the special congruency of the stimuli. Results were consistent with this hypothesis in that reports of illusory flashes were more frequent when the auditory stimuli originated from the same spatial location as the visual flash. Unexpectedly, we found that modulation of the illusion by spatial congruency was weaker when the visual stimulus was presented in the right visual field. We speculate that this might be a direct consequence of earlier processing of the illusory stimulus in the right visual pathway.

Item ID: 17545
Item Type: Conference Item (Poster)
Date Deposited: 23 Nov 2011 06:01
FoR Codes: 17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170112 Sensory Processes, Perception and Performance @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970117 Expanding Knowledge in Psychology and Cognitive Sciences @ 100%
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