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Types of Synaesthesia

Synaesthesia is the crossing over of 2 or more senses and there can be 31 possibilities of different combinations of senses. But clinically, it is usually only 2 senses that cross and this knocks it down to a potential 20 different pairings. Usually the pairing is unidirectional e.g. sound evokes colour, but colour does not evoke sound.

Synaesthesia is divided into 2 categories.

Two-Sensory Synaesthesia:

This is when stimulation of one modality triggers the perception in a second modality, in the absence of direct stimulation to this second modality.

Multiple-Sensory Synaesthesia:

This is when 3 or more senses crossed.
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