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Literally, the word synesthesia means ‘joined sensation’ (Greek: syn = union + aisthesis = to perceive).

Synesthesia is a condition where the perception of an external object or experience, triggers a perceptual experience in additional sensory modalities. For example, the visual perception of an object may also trigger an auditory sensation, or the auditory perception of a sound may also trigger a tactual sensation.

At its most basic, synesthesia describes multi-sensory experience. Specifically, synesthesia describes the phenomenon of experiencing visual, auditory, tactual stimuli as inter-linked. For those with synesthetic sensitivity, a triangle is perceived not only as a shape but may simultaneously be experienced as a sound (eg. a bell) or a colour (eg. red).