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A spatially collocated sound thrusts a flash into awareness

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A spatially collocated sound thrusts a flash into awareness

Auteurs : Máté Aller ; Anette Giani ; Verena Conrad ; Masataka Watanabe ; Uta Noppeney

Source :

RBID : PMC:4343005

Abstract

To interact effectively with the environment the brain integrates signals from multiple senses. It is currently unclear to what extent spatial information can be integrated across different senses in the absence of awareness. Combining dynamic continuous flash suppression (CFS) and spatial audiovisual stimulation, the current study investigated whether a sound facilitates a concurrent visual flash to elude flash suppression and enter perceptual awareness depending on audiovisual spatial congruency. Our results demonstrate that a concurrent sound boosts unaware visual signals into perceptual awareness. Critically, this process depended on the spatial congruency of the auditory and visual signals pointing towards low level mechanisms of audiovisual integration. Moreover, the concurrent sound biased the reported location of the flash as a function of flash visibility. The spatial bias of sounds on reported flash location was strongest for flashes that were judged invisible. Our results suggest that multisensory integration is a critical mechanism that enables signals to enter conscious perception.


Url:
DOI: 10.3389/fnint.2015.00016
PubMed: 25774126
PubMed Central: 4343005

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