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Graphics Interchange Format  |  2000-06-28  |  46.3 KB  |  371x359  |  8-bit (123 colors)
   ocr: Keyhole Area e - - - - Center Stimulus FIGUKE 1 To see at all, the eye needs first to disambiguate dots from non-dots. A basic solution is found in the "center on, surround off" retinal circuit.