Ganzfeld

Ganzfeld  :  the name of a technique in parapsychology that is used in the investigation of ESP.  A subject normally wears halved table tennis balls over the eyes while listening to a hissing sound through headphones.  This sound is often referred to as 'white noise'.  The experiment is conducted in this way in order to help the subject experience the absence of patterned stimulation which is useful in the study of ESP.