Sensory deprivation and perceptual isolation – Ganzfeld experiment
(from the German for “entire field”) is a technique that was ‘used in the field of parapsychology to test individuals for extra-sensory perception (ESP). It uses homogeneous and unpatterned sensory stimulation. The deprivation of patterned sensory input is said to be conducive to inwardly-generated impressions. The experiment is normally performed in a soundproof room, the participant wears headphones playing white noise while staring at a light source.
In my own research, I have also been using this as a means of heightening other senses, such as hearing smell and touch. Using it in combination with guided walks[See documentation here]