Abstract

Synaesthesia is a condition in which a sensory experience normallyassociated with one modality occurs when another modality is stimulated(Baron-Cohen and Harrison 1997). The commonest form of synaesthesia iscolour-word synaesthesia, which is subdivided into a chromatic-graphemic type(the dominant letter in a word induces a letter-specific colour experience) and achromatic-lexical type (each word triggers a specific colour experience) (Baron-Cohen and Harrison 1997). To date, little is known about the neural mechanismsassociated with synaesthesia (Grossenbacher and Lovelace 2001, Paulesu et al.,1995).Here, we report the case of R.S. with chromatic-lexical synaesthesia fornames of personally familiar people. To the best of our knowledge, this is thefirst report of such a form of synaesthesia. Functional imaging (fMRI) was usedto elucidate the neural basis of this form of chromatic-lexical synaesthesia andthe interaction of synaesthetic colour experience with the non-synaestheticperception of external colour.M

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