Pupillometry of grapheme-color synaesthesia.
Pupil diameters of color-grapheme synaesthetes were measured with an infrared eye-tracker while Stroop-like alphanumeric symbols were passively viewed. Pupils dilated more when synaesthetes viewed incongruently-colored symbols than congruently-colored symbols or symbols printed in the standard black ink. The results show that the physiological measure of pupillary diameter can be used as a marker of the synaesthetic experience.
Paulsen
Helle Gaare
HG
Department of Psychology, University of Tromsø, Tromsø, Norway.
Laeng
Bruno
B