کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
944944 925742 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Neuromodulation of multisensory perception: A tDCS study of the sound-induced flash illusion
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
پیش نمایش صفحه اول مقاله
Neuromodulation of multisensory perception: A tDCS study of the sound-induced flash illusion
چکیده انگلیسی

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.

Research highlights▶ Brain polarization alters audiovisual interactions. ▶ Cortical excitability shifts change conscious multisensory perception. ▶ Causal role of temporal and occipital cortices in the sound-induced flash illusion.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuropsychologia - Volume 49, Issue 2, January 2011, Pages 231–237
نویسندگان
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