Sensory Deprivation

Sensory deprivation or perceptual isolation is the deliberate reduction or removal of stimuli from one or more of the senses.

Simple devices such as blindfolds or hoods and earmuffs can cut off sight and hearing respectively, while more complex devices can also cut off the sense of smell, touch, taste, thermoception (heat-sense), and gravity

It is very common for at least one type of sensory deprivation to occur in any BDSM session, with gags, blindfolds and hoods frequently used. Full sensory deprivation though would be considered to be a more specialised activity.

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