Sensory deprivation and disorientation has been used in alternative medicine, for torture or punishment, and in psychological experimentation. It is defined as the reduction of sensory input into the human system, either by naturally occurring or induced. Simple artificial systems can reduce visuals and auditory influence. Other advanced techniques can alter smells, touch, taste, the perception of temperature and the sense of gravity.
Although there is evidence of sensory deprivation in use in the prisons of Abu Ghraib -- particularly the hooding -- it is still under debate whether these techniques constitute "severe pain or suffering" in violation of the articles of the Geneva Convention on prisoner torture.
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