![]() The percepts predominantly took the form of coloured patches, localised in body-centred space for five of the subjects and in head-centred space for the sixth. The aberrant experiences were compelling and reliable: detailed verbal descriptions of the colours were remarkably consistent in tests more than 2 months apart. Another saw Braille characters as coloured dots when he touched them. One experienced synaesthetic colours for all words. All perceived colours when they heard or thought about letters, numbers, and time-related words (days of the week and months of the year). Four of them had been without any form of genuine colour vision for more than 10 years. We studied six late-blind individuals who have retained synaesthetic colour perception. Synaesthesia is characterised by idiosyncratic ectopic sensations which commonly take the form of coloured visual impressions evoked by touch or hearing.
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