File:Synaesthesiabrain.jpg

Summary
Possible neural basis for grapheme-color synesthesia. The region of the visual pathway involved in recognizing letters and numbers (graphemes) is indicated in green, while one a region involved in color processing (hV4) is indicated in red. Due to the adjacency of these regions, there is an increased probability of connections being retained, leading to cross-activation between the grapheme area and hV4.

Edward M. Hubbard, Image first appeared in Ramachandran and Hubbard, 2001. As authors own work, journal has granted permission for use on wikipedia and creative commons projects. Note: This image also appears on the English language wikipedia. See http://en.wikipedia.org/wiki/Synesthesia