Hallucinating with table tennis balls

The Ganzfeld procedure exposes the participant to ‘unstructured’ sensations usually by placing half ping-pong balls over the eyes so they can only see diffuse white light and by playing white noise through headphones.

It is probably best known for its uses in parapsychology experiments, but it is also used to induce hallucinations and sensory distortions which are much more likely to occur in the absence of clearly defined sensory experiences.

 

http://mindhacks.com/2008/11/17/ganzfeld-hallucinations/

http://en.wikipedia.org/wiki/Ganzfeld_experiment

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