A substantial reduction in the volume of SENSORY information impinging on the body – for instance, sitting in a dark, silent room. Prolonged deprivation is potentially harmful as the body needs constant stimulation in order to function normally. The main input organs are the eyes, ears, skin and nose. The absence of sensations disorients a person and results in neurological dysfunction. Some interrogation techniques involve sensory deprivation to ‘soften up’ the individual being questioned.