This is the rarest form of Synesthesia where individual words and syllables evoke taste sensations in the mouth.

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​Synesthetic associations are constrained by early food experiences. In other words, the individual cannot taste something if they have not eaten it before as a child, so the taste of cake would be more common among lexical - gustatory synesthetes than gin and olives. ​​​​

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*There is an account of an individual that could only taste proper names *

 

 

It's hypothesized that this form of synesthesia is due in part to

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1. Increased connectivity between regions of the Insula
2. Cross wiring in the Lateral Sulcus: involved in taste processing ​
3. Temporal lobe: regions involved in auditory processing ​