Sensory deprivation in autoscopic illusion, and Joseph Conrad's "The secret sharer".
D003220:Conflict, Psychological; D006212:Hallucinations; D049673:History, 20th Century; D006801:Humans; D007088:Illusions; D008093:Literature, Modern; D011582:Psychological Theory; D012683:Sensory Deprivation; D014481:United States