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Grapheme-Color Synesthesia Induction With V4 Transcranial Direct Current Stimulation

Author

Listed:
  • Sergey S. Andreev

    (National Research University Higher School of Economics)

  • Viktor V. Moskvoretskiy

    (National Research University Higher School of Economics)

  • Alexey A. Gorin

    (National Research University Higher School of Economics)

  • Oksana O. Zinchenko

    (National Research University Higher School of Economics)

Abstract

Grapheme-color synesthesia (GC-S) is a neurological condition in which the perception of a grapheme elicits the experience of color or even the visual representation of that grapheme as colored. Previous research using transcranial magnetic stimulation on GC-synesthetes demonstrated enhanced excitability of the visual cortex. Consequently, we hypothesized that using anodal "offline" transcranial direct current stimulation on the visual cortex in area V4 followed by visual training could boost cortical excitability in the target areas and thus produce effects similar to GC-S in non-synesthetes. We discovered that after anodal stimulation, participants had a considerably smaller mean change in reaction time on white symbols than after sham and cathodal stimulation. Our findings indirectly support the cross-activation hypothesis.

Suggested Citation

  • Sergey S. Andreev & Viktor V. Moskvoretskiy & Alexey A. Gorin & Oksana O. Zinchenko, 2023. "Grapheme-Color Synesthesia Induction With V4 Transcranial Direct Current Stimulation," HSE Working papers WP BRP 137/PSY/2023, National Research University Higher School of Economics.
    • Handle: RePEc:hig:wpaper:137psy2023
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    More about this item

    Keywords

    tDCS; Grapheme-color synesthesia; Cross-activation; Visual cortex;
    All these keywords.

    JEL classification:

    • Z39 - Other Special Topics - - Tourism Economics - - - Other

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