The Ganzfeld effect is similar to sensory deprivation - instead of completely blocking out sensory input, one is exposed to highly unstructured stimuli instead. This causes the brain to generate neural noise patterns in an attempt to make sense of the otherwise empty information. Since our brains are designed to find patterns, it can start to make things up when there's no real pattern to find. The Ganzfeld effect frequently causes hallucinations and an altered state of mind and has considerable documentation in case studies and experimentation.
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