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In Synaesthesia: The Strangest Thing, researcher Jon Harrison considers whether the synaesthesia caused by hallucinogens is the same as "idiopathic synaesthesia", the type you're born with. Probably not, he says: "recent PET studies of the effect of LSD suggest that the areas typically activated are not those that lit up in our PET experiment. This suggests that the neural substrates of auditory visual events as a result of drug use are not the same as the substrates of idiopathic synaesthesia. In fact, it is not clear why we should expect any similarity; the subjective accounts given by hallucinogen users and synaesthetes are, after all, quite markedly different". (pp 207-8)