Interesting read about Donald O. Hebb (1904 - 1985) - famous Canadian psychologist known for his theory of Hebbian learning, the father of neuropsychology and neural networks - and his involvement with CIA interrogation techniques, including sensory deprivation:

2008 BBC reenactment of Donald Hebb's  experiments

"In classified experiments, Donald Hebb found that he could induce a state akin to drug-induced hallucinations and psychosis in just 48 hours – without drugs, hypnosis, or electric shock. Instead, for two days student volunteers at McGill University simply sat in a comfortable cubicle deprived of sensory stimulation by goggles, gloves, and earmuffs. “It scared the hell out of us,” Hebb said later, “to see how completely dependent the mind is on a close connection with the ordinary sensory environment, and how disorganizing to be cut off from that support.”"


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