Entoptic phenomena

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Entoptic phenomena, phosphines, solid shapes - visual sensations created under special conditions that are independent of the external light source - are the source of the human nervous system.

They can be triggered by various means such as: electrocause, sensory deprivation, hyperventilation, rhythmic movement, and psychoactive substances.

The anthropologists David Lewis-Williams and Thomas Dowson believe that geometric symbols appearing in prehistoric art are proof of the knowledge of hallucinogenic means by primitive peoples.

See terms related to medical terms and related wikipedia.

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