(German for "uniform or whole field"). A sensory-deprivation protocol for inducing a state of consciousness between wakefulness and sleep; in parapsychology, the ganzfeld is typically used in association with telepathy experiments.

A technique for investigating ESP in which the person experiences an absence of patterned stimulation. This generally involves the subject wearing halved table-tennis balls over the eyes while listening to hiss, or white noise, through headphones.

A clinical technique for investigating PSI Phenomena, in which the test subject experience an absence of patterned stimulation. This technique generally involves the subject wearing halved table tennis balls over the eyes while listening to either white or pink noise signals through a headset to induce a state of mild sensory deprivation by providing 'homogenous' sensory fields.

a perfectly smooth, solid-covered background that is shaped like a hollowed out globe.