Sensory Deprivation and Float Tanks
Your brain spends roughly 80% of its total processing power simply interpreting external reality: managing gravity, filtering noise, and analyzing light.
Sensory deprivation asks a question that fascinated psychonaut John C. Lilly in the 1950s: What happens to human consciousness when you turn all external inputs off? The answer: the consciousness turns violently inward, producing profound altered states without the use of chemical compounds.
The Science of Float Therapy (REST)
Restricted Environmental Stimulation Therapy (REST) occurs inside a lightproof, soundproof tank. The tank is filled with 10 inches of water heavily saturated with 1,000 lbs of Epsom salts (magnesium sulfate).
- Temperature Transparency: Both the air and water are heated exactly to skin temperature (93.5°F). Within minutes, the sensation of where the body ends and the water begins completely vanishes.
- Buoyancy: The extreme density of the salt allows the body to float effortlessly like a cork, simulating anti-gravity and removing all joint and muscular tension.
- Magnesium Absorption: The transdermal absorption of magnesium aids in flushing lactic acid and immediately crashing blood cortisol levels.
The Brain in a Vacuum
When the brain is suddenly starved of its constant diet of sensory data, it doesn't shut off; it seeks stimuli from within. This phenomenon is related to the Ganzfeld Effect.
Within the first 30 minutes, most users enter a heavy Theta wave state. By hour two, auditory and visual hallucinations are incredibly common. The mind begins projecting childhood memories, geometric patterns, or entirely new landscapes onto the pure black void of the tank, identical to the onset of classic psychedelics.