Perceptual destabilization induced by ignored stimuli.

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Other Title
  • 無視される刺激による知覚の不安定化(視知覚とその応用及び一般)
  • 無視される刺激による知覚の不安定化
  • ムシサレル シゲキ ニ ヨル チカク ノ フアンテイカ

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Abstract

Perception of ambiguous visual patterns changes stochastically from one percept to the other. It was recently shown that auditory and tactile stimulation affect perceptual alternation in vision, suggesting that perceptual alternation is not always a uni-modal phenomenon. In the present study, we investigated how cross-modal interaction affects the temporal characteristics of perceptual alternation in vision. The participants observed and reported if two dots in an ambiguous visual pattern appeared to be moving horizontally or vertically. In addition, task-irrelevant visual or auditory background stimuli were present at either random or non-random temporal interval. The participants were explicitly told not to attend the background stimuli. In the random condition, both the audio and the visual stimuli often induced an immediate perceptual alternation of the bi-stable pattern. No effect was found in the non-random condition. In addition, there was a correlation between the magnitude of the effect of the visual and the auditory background stimuli, i.e. participants that were highly influenced by the visual stimuli were also highly influenced by the auditory stimuli. The influence of the background stimuli was independent of the natural or spontaneous frequency of perceptual shift, i.e. participants that had a low frequency of spontaneous perceptual alternation could still be influenced by the visual and the auditory background stimuli. These results suggested that: (1) ignored stimuli, if random and therefore unpredictable, reduce perceptual stability, (2) perceptual destabilization is caused by supra-modal processing, and (3) perceptual destabilization is independent from sensory specific processes which generates spontaneous perceptual alternation.

Journal

  • ITE Technical Report

    ITE Technical Report 32.48 (0), 33-38, 2008

    The Institute of Image Information and Television Engineers

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