CUED Publications database

Neuromodulation of multisensory perception: a tDCS study of the sound-induced flash illusion.

Bolognini, N and Rossetti, A and Casati, C and Mancini, F and Vallar, G (2010) Neuromodulation of multisensory perception: a tDCS study of the sound-induced flash illusion. Neuropsychologia, 49. pp. 231-237.

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This study explores whether brain polarization could be effective in modulating multisensory audiovisual interactions in the human brain, as measured by the 'sound-induced flash illusion' (Shams et al., 2000). In different sessions, healthy participants performed the task while receiving anodal, cathodal, or sham tDCS (2 mA, 8 min) to the occipital, temporal, or posterior parietal cortices. We found that up- or down-regulating cortical excitability by tDCS can facilitate or reduce audiovisual illusions, depending on the current polarity, the targeted area, and the illusory percept. Specifically, the perceptual 'fission' of a single flash, due to multiple beeps, was increased after anodal tDCS of the temporal cortex, and decreased after anodal stimulation of the occipital cortex. A reversal of such effects was induced by cathodal tDCS. Conversely, the perceptual 'fusion' of multiple flashes due to a single beep was unaffected by tDCS. This evidence adds novel clues on the cortical substrate of the generation of the sound-flash illusion, and opens new attractive possibilities for modulating multisensory perception in humans: tDCS appears to be an effective tool to modulate the conscious visual experience associated with multisensory interactions, by noninvasively shifting cortical excitability within occipital or temporal areas.

Item Type: Article
Uncontrolled Keywords: Acoustic Stimulation Adult Analysis of Variance Auditory Perception Brain Mapping Electric Stimulation Electroencephalography Female Humans Illusions Male Photic Stimulation Reaction Time Visual Perception Young Adult
Divisions: Div F > Computational and Biological Learning
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:59
Last Modified: 12 Jun 2018 01:57