When the first humans began to explore the dark crevices of the world, they were the first of us to experience a situation where they could deprive their senses from their harsh daily lives and slip into a mystical experience and reflect inward. Deep within those caverns, animal cults and secret societies emerged, as more complex and abstract ideas were experienced through ecstatic visions (Hayden, 2003). However, our ancestors did not then realize that those visions came from deep within themselves and one of the world's most complicated information processing machines, the human nervous system. We now do know these things and because of this we have developed the psychological and cognitive sciences in order to measure and analyze how we interact with the world around, and inside us, as objectively as possible.
Why Sensory Deprivation?
Why would anyone want to deprive their senses? Why would anyone not want to feel anything? Well, simply put, just because you are in a sensory deprivation tank does not mean you don’t feel anything. All you are doing is minimizing the amount of EXTERNAL stimuli coming into your nervous system. So what does your nervous system do? It cranks up the volume. It tries to detect any sort of stimuli and yet still minimal is coming… so what happens?