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Training Synesthetic Letter-color Associations by Reading in Color
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Assessing Lateral Interaction in the Synesthetic Visual Brain.

Diana Jimena Arias1,2, Anthony Hosein1,2,3, Dave Saint-Amour1,2,3

  • 1Department of Psychology, Université du Québec à Montréal, Montréal, QC H2X 3P2, Canada.

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Summary
This summary is machine-generated.

Grapheme-color synesthesia involves unusual color perceptions for letters/numbers. This study found similar visual cortex activity in synesthetes and controls, though long-range interactions correlated with subjective experience.

Keywords:
EEGlateral interactionoccipital cortexsynesthesiavisual evoked potentials

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Grapheme-color synesthesia, where stimuli like letters/numbers evoke color perceptions, is thought to involve atypical brain connectivity, particularly in visual areas.
  • Understanding the impact of synesthesia on visual processing requires investigating neural mechanisms like local functional connectivity.

Purpose of the Study:

  • To investigate the impact of synesthesia on the visual brain by assessing lateral interactions in the visual cortex.
  • To compare local functional connectivity between color-grapheme synesthetes and controls using electrophysiological measures.

Main Methods:

  • Steady-state visual evoked potentials (ssVEPs) were recorded from synesthetes (n=6) and controls (n=21) using a windmill/dartboard paradigm.
  • Discrete Fourier Transform analysis extracted ssVEP fundamental frequency and second harmonics from stimuli presented at 4.27 Hz.
  • Short-range and long-range lateral interactions were assessed using amplitude-based indices.

Main Results:

  • Synesthetes exhibited statistically weaker signal coherence of the fundamental frequency compared to controls.
  • No significant group differences were found in short-range or long-range lateral interaction indices.
  • A significant correlation emerged between long-range lateral interactions and the type of synesthetic experience (projector vs. associator).

Conclusions:

  • Occipital activity related to lateral interactions in synesthetes does not substantially differ from controls.
  • Further research is needed to elucidate the impact of synesthesia on visual processing and its relation to subjective experiences.