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Vision Res. 2013 Oct 18;91:1-7. doi: 10.1016/j.visres.2013.07.013. Epub 2013 Jul 26.

Complexity of visual stimuli affects visual illusion induced by sound.

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Department of Psychology, Graduate School of Arts & Letters, Tohoku University, Kawauchi 27-1, Aoba-ku, Sendai 980-8576, Japan. Electronic address:


The fission illusion is induced by multisensory (audio-visual) integration. In the present study, we assume that perceptual efficiency affects the fission illusion's rate because this illusion occurs in a short temporal range through the integration of visual and auditory information. The present study examined the effect of perceptual efficiency on the fission illusion by presenting visual patterns with various degrees of complexity. The results indicated that it was more difficult to induce the fission illusion when more complex visual patterns were used. The effect of pattern on the illusion differed according to the stimulus onset asynchrony between the first visual stimulus and the second auditory stimulus. These results suggest that the fission illusion has a higher probability of occurring when the perceptual process of the first visual stimulus is completed and integrated with the first beep before the presentation of the second beep. Thus, the audio-visual integration is affected by the perceptual efficiency of the physical stimuli.


Audio-visual integration; Audio-visual interaction; Complexity; Fission illusion; Processing speed; Visual pattern

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