Acrossover of sensory experience where an individual “sees sounds” or “hears colors” is know as

Synesthesia

Explanation:

Synesthesia is a manifestation associated with the interaction between distinct spheres from conventional senses. It can be expressed in the auditory, olfactory, visual or tactile plane, as well as in the field of taste. Thus, the person affected by this phenomenon can evoke the taste of a candy when writing a letter, or relate a certain color to the smell of a flower.

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answer; can each be concretely realized in different ways;