Do grapheme-color synesthetes bind color to a spatial plane?
Bryan Alvarez1, Lynn Robertson1,2 1University of California Berkeley, Berkeley, CA 2VA Northern California Health Care System Grapheme-color synesthesia is a human phenomenon in which a letter or number (grapheme) evokes the visual perception of color. The color is most often described as existing in the mind’s eye (non-projector synesthetes) and less commonly as existing in the same spatial location as the printed text (projector synesthetes). Data were collected from 15 grapheme-color synesthetes (12 non-projectors and 3 projectors) and 12 matched non-synesthetic controls. We designed a new procedure to examine the effects of depth perception as induced through stereogoggles as it relates to synesthetic color priming. On each trial an achromatic letter was shown to synesthetes followed by a color patch that either appeared on the same depth plane or that changed planes. Importantly, the letter and the color patch were in the same location on the screen but appeared as if they were cl
