Their movement is restricted by the experimental instructions, but not by any mechanical restraints. In chamber REST, the subject lies on a bed in a completely dark and sound-reducing (on average, 80 dB) room for up to 24 hours. There are many different numbers of basic methods of restricted environmental stimulation, including therapy (REST), chamber REST, and flotation REST. Restricted environmental stimulation therapy (REST) It was also used in prisons such as Guantanamo. The European Court of Human Rights ruled that the use of the five techniques by British security forces in Northern Ireland amounted to a practice of inhuman and degrading treatment. Sensory deprivation techniques were developed by some of the armed forces within NATO, as a means of interrogating prisoners within international treaty obligations. In this case a constant uniform stimulus is used instead of attempting to remove the stimuli this leads to effects which have similarities to sensory deprivation. Ī related phenomenon is perceptual deprivation, also called the Ganzfeld effect. Short-term sessions of sensory deprivation are described as relaxing and conducive to meditation however, extended or forced sensory deprivation can result in extreme anxiety, hallucinations, bizarre thoughts, and depression. When deprived of sensation, the brain attempts to restore sensation in the form of hallucinations. Sensory deprivation has been used in various alternative medicines and in psychological experiments (e.g. Simple devices such as blindfolds or hoods and earmuffs can cut off sight and hearing, while more complex devices can also cut off the sense of smell, touch, taste, thermoception (heat-sense), and the ability to know which way is down. Sensory deprivation or perceptual isolation is the deliberate reduction or removal of stimuli from one or more of the senses. Deliberate reduction or removal of stimuli
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