Psychedelic Information Theory
Shamanism in the Age of Reason
Search Results : visual
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Interpretation of visual space under drug-induced ergotropic and trophotropic arousal
... counter-adaptation, i.e. the optimization of visual information. Optimization is independent from the rat at which the distorting stimulus is presented. Optimization is regarded here as a cortical (perceptual-behavioral) interpretive process wh...
... the limitations of expanded consciousness. The visual Spectrum [fig]2;1[/fig]The human visual spectrum has evolved to work best in a small window of sunlight that penetrates the Earth’s atmosphere, comprising the white-light band seen in a rai...
... of a sawtooth luminance grating in the visual periphery. This illusion was first described by Faubert and Herbert (1999), although a similar effect called the "escalator illusion" was reported by Fraser and Wilcox (1979). A variant of the ...
A Motion Illusion Reveals Mechanisms of Perceptual Stabilization
visual illusions are valuable tools for the scientific examination of the mechanisms underlying perception. In the peripheral drift illusion special drift patterns appear to move although they are static. During fixation small involuntary eye movemen...
... enough (e.g. around 20 times per second) our visual system, namely its motion department, interpolates the intervening missing positions. This interpolation relies on a “nearest neighbour” principle – thus, if the displacement of t...
Effects of psychodysleptic drug psilocybin on visual perception. Changes in brightness preference.
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Psilocybin-induced contraction of nearby visual space
... stability of the abathic plane, i.e. Euclidean visual space, was investigated in 16 volunteers with a median age of 23.5 years under 160 mgrg/kg psilocybininduced ergotropic arousal. Handwriting area and pressure were also measured in the same sub...
Why are Psychedelics Spiritual?
... use the term visions, spirit visions need not be visual and may take the form of a disembodied voice, a channeled consciousness, a dream journey, or an actual anthropomorphic spirit that takes physical form. Spirit visions can be projected directly ...
Uncoiling the spiral: Maths and hallucinations
... Heinrich Klüver. Klüver's interest in visual perception had led him to experiment with peyote, that cactus made famous by Carlos Castaneda, whose psychoactive ingredient mescaline played an important role in the shamanistic rituals of man...
Vivid dreams, hallucinations, psychosis and REM sleep in Guillain-Barré syndrome
... illusory body tilt), hallucinations (60%, mainly visual) and delusions (70%, mostly paranoid). They appeared a median 9 days after disease onset (range 1-40 days, during the progression or the plateau of the disease), and lasted a median 8 days. Sev...
Jimson Weed (Datura stramonium) Poisoning
... many as 83% of cases; typically they are simple visual images in natural colors, but infrequently also tactile hallucinations of crawling insects.(2) The onset of symptoms occurs within 30 to 60 minutes after smoking leaves or drinking tea; and ...
Sleep Deprivation, Psychosis and Mental Efficiency
... he began to have hallucinations and distorted visual perceptions. At one point Tripp became quite upset when he thought that the spots on a table were insects. He thought that there were spiders crawling around the booth and even once complained ...
... techniques. This book is also a visual feast, with numerous color drawings and paintings created by research participants (see featured artist Sherana Harriette Frances' book Drawing It Out: Befriending the Unconscious). Many of the...
Notes on Progressive Hallucination
... arising progressively and being wiped from visual memory by eye movements taken from subjective reports....
... share many of the formal qualities of dreams, visual memory, and imagination, and may be the most seductive aspect of experimenting with hallucinogens. Eidetic hallucinations rise and fall like dream snippets, rarely holding form for more than a ...
... in sharp line, contrast, and texture detail in visual memory. This can be described as a rendering ambiguity error, and indicates a drifting of contrast information both laterally and radially across the cortex. This drifting in the visual field i...
... disorder (HPPD), the subject retains some of the visual effects of hallucinogens long after the drug should have metabolized;5 persisting reactions to neural stress imply neuroplasticity. Psychedelics have been used to facilitate cult induction and ...
An Overview of Physical Shamanism
... or cellular automata are perhaps the best visual metaphors for the spontaneous recursive organization of psychedelic visual hallucinations, and there is a very fractal or cellular element to the psychedelic experience which evolves along the ...
... 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 phosphenes can be created by applying pressure to the...
1. To explore the feasibility of a visual prosthesis for the blind, human visual cortex has been stimulated during a series of surgical procedures on conscious volunteers undergoing other occipital lobe surgery. 2. Area no. 17 seems the most effec...
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