Why did he regress ? I don't understand that.
Am I to believe that if I eat some mushrooms & get inside a sensory deprivation tank I'll regress into the previous being which in which my soul was ?
Sounds like you're approaching this film a bit too literally. Ever heard of (or believe in) mysticism?
"Anyway, we delivered the Bomb."
The somewhat ludicrous premise is that altered states of consciousness induced by drugs and isloation tanks are as real as normal states of consciousness, and these altered states include ancient memories of more primitive states of existence laid down in DNA. Thus by invoking these altered states, Jessup gets in touch with his proto-human side.
shareOne man's ludicrous is another man's thought-provoking.
The future, Mr. Gittes, the future.