Altered States

Altered States is a 1980 American science fiction body horror film directed by Ken Russell, and based on the novel of the same name by playwright and screenwriter Paddy Chayefsky. The film was adapted from Chayefsky's 1978 novel and is his final screenplay. The novel and the film are based in part on John C. Lilly's sensory deprivation research conducted in isolation tanks, under the influence of psychoactive drugs like mescaline, ketamine and LSD.