Dementia puglistica

Dementia pugilistica was a syndrome affecting boxers that was caused by cumulative cerebral injuries and was characterized by impaired cognitive processes. A sufferer was commonly referred to as being 'punch-drunk' or 'punchy'.

While Chakotay was hallucinating when the USS Voyager was trapped in chaotic space in 2375, a vision of The Doctor told him that he was delusional due to dementia pugilistica.