Psychedelic Information Theory
Shamanism in the Age of Reason
Search Results : optic
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What is Nonlinear Hallucination?
... of destabilization of signal coupling in optic networks. (Fig. 4) Subjective reports indicate that DiPT causes a unique nonlinear pitch transposition in audio networks, causing subjects to hear sounds modulated down an entire octave or more ...
... million photoreceptors feeding into 1.2 million optic projections, with a spatial compression ratio of roughly 100 to 1. Photoreceptors in the eye are distributed in rings with color-sensitive cones clustering towards the center and contrast-sensit...
... that can shed light on their origins. Entoptic hallucinations are characterized by geometric forms originating in the retina and optic tract.1 Eidetic hallucinations are characterized by photographic images originating from the hippocampus a...
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 ...
Altered States: The Origin of Art in Entoptic Phenomena
... art Lewis-Williams and Dowson see entoptic phenomena very similar to those produced by people in altered states of consciousness today. 'Entoptic' is derived from the Greek for 'within vision', that is, anywhere within the optic system b...
The Signs of All Times: Entoptic Phenomena in Upper Palaeolithic Art
... art Lewis-Williams and Dowson see entoptic phenomena very similar to those produced by people in altered states of consciousness today. 'Entoptic' is derived from the Greek for 'within vision', that is, anywhere within the optic system b...
Presynaptic uptake blockade hypothesis for LSD action at the lateral inhibitory synapse in Limulus
... by light or by antidromic stimulation of the optic nerve in the presence of LSD, serotonin (5-HT), chlorimipramine, or a bathing medium whose high Mg++ and low Ca++ concentrations partially or completely blocked synaptic transmission. We found (...
What Geometric Visual Hallucinations Tell Us about the Visual Cortex
Many observers see geometric visual hallucinations after taking hallucinogens such as LSD, cannabis, mescaline or psilocybin; on viewing bright ickering lights; on waking up or falling asleep; in “near-death” experiences; and in many other synd...
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