grapheme-colour synaesthesia
   A term used to denote a type of synaesthesia in which letters or numbers are perceived as inherently coloured. Thus the A can be experienced as red, the B as green, the C as magenta, and so on. Intraindividually the associations between graphemes and colours tend to remain constant over time; interindividual constancies have never been described. The German Egyptologist Karl Lepsius (1810-1884) reportedly employed grapheme-colour synaesthesias as a guide in his philological inquiries. A woman described by the British scientist Sir Francis Galton (18221911) used hers to facilitate reading. Grapheme-colour synaesthesias can also be classified as atypeof * synaesthetic configuration. They should not be confused with * number-forms.
   References
   Cytowic, R.E. (2002). Synesthesia. A union of the senses. Second edition. Cambridge, MA: MIT Press.
   Galton, F. (1883). Inquiries into human faculty and its development. London: J.M. Dent & Sons.
   Parish, E. (1897). Hallucinations and illusions. A study ofthe fallacies ofperception. London: Walter Scott.

Dictionary of Hallucinations. . 2010.

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