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Sound-Induced Flash Illusion is Resistant to Feedback Training

Rosenthal, Orna and Shimojo, Shinsuke and Shams, Ladan (2009) Sound-Induced Flash Illusion is Resistant to Feedback Training. Brain Topography, 21 (3-4). pp. 185-192. ISSN 0896-0267.

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A single flash accompanied by two auditory beeps tends to be perceived as two flashes (Shams et al. Nature 408:788, 2000, Cogn Brain Res 14:147–152, 2002). This phenomenon is known as ‘sound-induced flash illusion.’ Previous neuroimaging studies have shown that this illusion is correlated with modulation of activity in early visual cortical areas (Arden et al. Vision Res 43(23):2469–2478, 2003; Bhattacharya et al. NeuroReport 13:1727–1730, 2002; Shams et al. NeuroReport 12(17):3849–3852, 2001, Neurosci Lett 378(2):76–81, 2005; Watkins et al. Neuroimage 31:1247–1256, 2006, Neuroimage 37:572–578, 2007; Mishra et al. J Neurosci 27(15):4120–4131, 2007). We examined how robust the illusion is by testing whether the frequency of the illusion can be reduced by providing feedback. We found that the sound-induced flash illusion was resistant to feedback training, except when the amount of monetary reward was made dependent on accuracy in performance. However, even in the latter case the participants reported that they still perceived illusory two flashes even though they correctly reported single flash. Moreover, the feedback training effect seemed to disappear once the participants were no longer provided with feedback suggesting a short-lived refinement of discrimination between illusory and physical double flashes rather than vanishing of the illusory percept. These findings indicate that the effect of sound on the perceptual representation of visual stimuli is strong and robust to feedback training, and provide further evidence against decision factors accounting for the sound-induced flash illusion.

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Additional Information:© The Author(s) 2009. This article is published with open access at Springer Open Choice License (compatible with the Creative Commons Attribution-Noncommercial Licence) Received: 10 February 2009 / Accepted: 16 March 2009 / Published online: 2 April 2009. We thank Ione Fine for her thorough and insightful comments. This study was funded by a grant from Human Frontier of Science Program.
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Human Frontier of Science ProgramUNSPECIFIED
Subject Keywords:Crossmodal integration; Visual perception; Reward; Learning
Issue or Number:3-4
Record Number:CaltechAUTHORS:20090916-144639293
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Usage Policy:Springer Open Choice License (compatible with the Creative Commons Attribution-Noncommercial Licence)
ID Code:15887
Deposited By: Tony Diaz
Deposited On:18 Sep 2009 22:43
Last Modified:03 Oct 2019 01:04

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