synesthesia
A neurological phenomenon where stimulation of one sensory pathway leads to automatic, involuntary experiences in a second sensory pathway (e.g., seeing colors when hearing music).
She has synesthesia and sees colors when she hears sounds.
共感覚は病気ではなく、脳の特性の一つと考えられている。
Synesthesia is not a disease but is considered a characteristic of the brain.