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Dynamic Double Flash Illusion: Auditory Triggered Replay of Illusory Visual Expansion

Stiles, Noelle R. B. and Tanguay, Armand R., Jr. and Shimojo, Shinsuke (2020) Dynamic Double Flash Illusion: Auditory Triggered Replay of Illusory Visual Expansion. Multisensory Research, 33 (1). pp. 87-108. ISSN 2213-4794.

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In the original double flash illusion, a visual flash (e.g., a sharp-edged disk, or uniformly filled circle) presented with two short auditory tones (beeps) is often followed by an illusory flash. The illusory flash has been previously shown to be triggered by the second auditory beep. The current study extends the double flash illusion by showing that this paradigm can not only create the illusory repeat of an on-off flash, but also trigger an illusory expansion (and in some cases a subsequent contraction) that is induced by the flash of a circular brightness gradient (gradient disk) to replay as well. The perception of the dynamic double flash illusion further supports the interpretation of the illusory flash (in the double flash illusion) as similar in its spatial and temporal properties to the perception of the real visual flash, likely by replicating the neural processes underlying the illusory expansion of the real flash. We show further that if a gradient disk (generating an illusory expansion) and a sharp-edged disk are presented simultaneously side by side with two sequential beeps, often only one visual stimulus or the other will be perceived to double flash. This indicates selectivity in auditory–visual binding, suggesting the usefulness of this paradigm as a psychophysical tool for investigating crossmodal binding phenomena.

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Stiles, Noelle R. B.0000-0002-7352-5815
Additional Information:© 2019 Stiles et al. This is an open access article distributed under the terms of the CC-BY 4.0 License. Received 21 December 2018; accepted 17 July 2019; Online Publication Date: 29 Aug 2019. We are pleased to acknowledge key insights and useful comments from Daw-An Wu, the associate editor, and the reviewers. We are also grateful for support from the National Institutes of Health; the Philanthropic Educational Organization Scholar Award Program; the Arnold O. Beckman Postdoctoral Scholars Fellowship Program; the National Science Foundation; and the Core Research for Evolutional Science and Technology Program of the Japan Science and Technology Agency. The authors declare no competing financial interests.
Funding AgencyGrant Number
Arnold and Mabel Beckman FoundationUNSPECIFIED
Japan Science and Technology AgencyUNSPECIFIED
Subject Keywords:Crossmodal; multisensory; vision; audition; illusion; double flash; auditory–visual binding
Issue or Number:1
Record Number:CaltechAUTHORS:20191028-151652019
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99507
Deposited By: Tony Diaz
Deposited On:28 Oct 2019 22:48
Last Modified:09 Mar 2020 13:19

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