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Synaesthetic photisms influence visual perception.

D Smilek1, M J Dixon, C Cudahy

  • 1Department of Psychology, University of Waterloo, Waterloo, Ontario, Canada. dsmilek@watarts.uwaterloo.ca

Journal of Cognitive Neuroscience
|October 12, 2001
PubMed
Summary
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Digit-color synaesthesia causes colors to be projected onto viewed digits. This study found that synaesthesia negatively impacted digit perception, suggesting color influences visual processing.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Perception

Background:

  • Synaesthesia is a neurological condition where stimulation of one sensory pathway leads to involuntary experiences in a second sensory pathway.
  • Digit-color synaesthesia, specifically, involves experiencing colors when viewing digits.
  • The subjective experience of synaesthetic perceptions, like projected colors, requires objective validation.

Purpose of the Study:

  • To investigate whether the colored photisms reported by a digit-color synaesthete (C) objectively influence her perception of black digits.
  • To determine if synaesthetic color experiences affect visual identification and localization tasks.
  • To explore the neural mechanisms underlying synaesthesia's impact on visual perception.

Main Methods:

Related Experiment Videos

  • A digit-color synaesthete (C) and non-synaesthete controls performed visual tasks involving identifying and localizing digits.
  • Stimuli included target digits presented against backgrounds congruent or incongruent with the synaesthete's reported digit-color photisms.
  • Performance metrics (accuracy, localization) were compared between congruent and incongruent trials for both groups.

    • Main Results:

    • The synaesthete (C) exhibited poorer performance in identifying and localizing digits on congruent trials compared to incongruent trials.
    • Non-synaesthete controls did not show significant performance differences between congruent and incongruent trials.
    • These findings indicate that C's synaesthetic photisms demonstrably interfere with her visual perception of digits.

    Conclusions:

    • The colored photisms experienced by digit-color synaesthetes can objectively influence visual perception.
    • Color information, even when synaesthetically generated, modulates the processing of visual stimuli like digits.
    • A model involving reentrant pathways in the visual system is proposed to explain how color influences digit perception in synaesthesia.