A common sensory deprivation system is termed a floatation tank or chamber. The subject is suspended in the sound-proof and light-proof tank which is filled with skin-temperature salt water, correctly restrained and positioned a subject will be unable to experience many common inputs. Hallucinations, anxiety, depression and unusual thoughts are a common reaction to extended sensory deprivation, proving a deep human need for almost constant stimulus. Shorter term exposure can be relaxing and other benefits are claimed.
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