Whereas developmental cases tend to be either of the cognitive‐sensory or sensory‐sensory types, acquired cases tend to be limited to the sensory‐sensory types. Synesthesia can be either developmental in origin (present throughout the life span, with a hereditary component 2 ) or acquired. 1 The stimuli that induce synesthesia can be either cognitive (eg, thinking of a number) or sensory (eg, listening to music). Synesthesia is the automatic elicitation of conscious perceptual experiences by stimuli not normally associated with such experiences (eg, tasting words, hearing colors). 7 These cases typically have peripheral damage to the Most previous cases of acquired synesthesia have arisen as a result of sensory deafferentation in the visual modality resulting in acquired visual synesthesias such as sound‐vision 4–6 and touch‐vision synesthesias. ![]() 3 study makes an important contribution to this emerging literature. Acquired cases of synesthesia have not been extensively documented, and Ro et al. (Note: I use the convention of placing the stimulus that elicits the experience before the hyphen and the experience itself after the hyphen.) This could reflect the fact that the onset of synesthesia predates the learning of cultural knowledge (eg, words, letters, numbers) in developmental but not in acquired cases. Acquired auditory‐tactile synesthesia Acquired auditory‐tactile synesthesia
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