Input (grade 13): Synesthesia is also sometimes reported by individuals under the influence of psychedelic drugs, after a stroke, during a temporal lobe epilepsy seizure, or as a result of blindness or deafness.
Output (grade 10): Synesthesia is sometimes reported by people using psychedelic drugs, after a stroke, or during an epileptic seizure. It is also reported to be a result of blindness or deafness.