Contrast affects the strength of synesthetic colors.

@article{Hubbard2006ContrastAT,
  title={Contrast affects the strength of synesthetic colors.},
  author={Edward M Hubbard and Sanjay G. Manohar and Vilayanur S. Ramachandran},
  journal={Cortex; a journal devoted to the study of the nervous system and behavior},
  year={2006},
  volume={42 2},
  pages={184-94}
}
Grapheme-color synesthesia is an automatic, involuntary experience of seeing colors when viewing numbers, letters or words on a printed page. Previous research has demonstrated that synesthesia is a genuine perceptual phenomenon, but crucially, all of these experiments have used high-contrast letters and numbers. Our synesthete, JC, anecdotally reported that the strength of his synesthetic colors varied depending on whether the graphemes were presented in high or low contrast. To test this, we… CONTINUE READING