The easiest to understand is the sensory level. Experiments in sensory deprivation, during which volunteers are cut off from normal stimulation of their senses, have shown that the absence of novel sensory stimuli can lead to bewilderment and impaired mental functioning. By the same token, the input of too much disorganized, patternless or chaotic sensory stimuli can have similar effects. It is for this reason that practitioners of political or religious brainwashing make use not only of sensory deprivation (solitary confinement, for example) but of sensory bombardment involving flashing
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Sensory Dsprivation and overatimulation
