Showing 1 to 5 of 5

Entoptic Hallucination

Entoptic hallucination, geometric hallucinations, or phosphenes, are one of the most commonly reported visual effects of psychedelics. Phosphenes are a sensation of light caused by excitation of the retina by mechanical or electrical means. Pressure ...

Autohypnotic Induction of Sleep Rhythms Generates Visions of Light with Form-constant Patterns

Autohypnotic Induction of Sleep Rhythms Generates Visions of Light with Form-constant Patterns. [fig]1;0[/fig] [fig]2;0[/fig]...

Effects of Chemical Stimulation of Electrically-Induced Phosphenes on their Bandwidth, Shape, Number and Intensity

The perception of patterns not resulting from viewing external objects but stimulated by cranial electrodes with pulse currents within the electroencephalographic frequency range ('phosphenes') has been investigated in earlier work. The experiments d...

Altered States: The Origin of Art in Entoptic Phenomena

... and refer to both under the general term 'entoptics'. They do, however, distinguish between entoptics and hallucinations. Entoptics are geometric patterns whose origins are in the nervous system itself, whereas hallucinations are iconic and c...

The Signs of All Times: Entoptic Phenomena in Upper Palaeolithic Art

... and refer to both under the general term 'entoptics'. They do, however, distinguish between entoptics and hallucinations. Entoptics are geometric patterns whose origins are in the nervous system itself, whereas hallucinations are iconic and c...

Showing 1 to 5 of 5