Vision merges with touch in a purely tactile discrimination

Psychological Science
Ehsan ArabzadehJustin A Harris

Abstract

To construct a coherent percept of the world, the brain continuously combines information across multiple sensory modalities. Simple stimuli from different modalities are usually assumed to be processed in distinct brain areas. However, there is growing evidence that simultaneous stimulation of multiple modalities can influence the activity in unimodal sensory areas and improve or impair performance in unimodal tasks. Do these effects reflect a genuine cross-modal integration of sensory signals, or are they due to changes in the perceiver's ability to locate the stimulus in time and space? We used a behavioral measure to differentiate between these explanations. Our results demonstrate that, under certain circumstances, a noninformative flash of light can have facilitative or detrimental effects on a simple tactile discrimination. The effect of the visual flash mimics that produced by a constant tactile pedestal stimulus. These findings reveal that sensory signals from different modalities can be integrated, even for perceptual judgments within a single modality.

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Citations

Oct 2, 2013·Cognitive Neurodynamics·W Y WangY Hu
Mar 28, 2009·Proceedings. Biological Sciences·David BurrMaria Concetta Morrone
Dec 4, 2009·PloS One·Elliot Freeman, Preeti Verghese
Nov 19, 2013·PloS One·Onno van der GroenDavid Alais
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May 12, 2011·Brain Research·Anne CaclinMarie-Hélène Giard
Jul 15, 2015·Brain Stimulation·Arman AbrahamyanJustin A Harris
Nov 12, 2010·Journal of Neurophysiology·Mehdi Adibi, Ehsan Arabzadeh
Aug 22, 2014·Journal of Neurophysiology·Ehsan ArabzadehIngvars Birznieks
Mar 18, 2017·Neuroscience of Consciousness·Nathan FaivreRoy Salomon

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