Psychedelic Information Theory
Shamanism in the Age of Reason
Search Results : visual
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We studied orientation selectivity in V1 of alert monkeys and its relationship to other physiological parameters and to anatomical organization. Single neurons were stimulated with drifting bars or with sinusoidal gratings while compensating for eye ...
Local cortical lesions abolish lateral inhibition at direction selective cells in cat visual cortex
Many cells in the cat visual cortex display a strong selectivity for the direction of motion of an optimally oriented stimulus. Postsynaptic inhibition has been suggested to generate this direction selectivity in simple cells, but the intracortical p...
Pinna illusion is the first visual illusion showing a rotating motion effect. In Figure 1 the squares, delineated by two white and two black edges each, are grouped by proximity in two concentric rings. All the squares have the same width, length, an...
Recurrent Excitation in Neocortical Circuits
... describes how populations of neurons in cat visual cortex can use excitatory feedback, characterized as an effective "network conductance", to amplify their feedforward input signals and demonstrates how neuronal discharge can be kept proportio...
Mathematical Neuroscience: From Neurons to Circuits to Systems
... seen in the early stages of drug-induced visual hallucinations....
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...
A mathematical theory of visual hallucination patterns
... concomitants of the 'form constants' seen during visual hallucinosis....
Orientation selectivity in visual cortex by fluctuation-controlled criticality
... neuronal network model of macaque primary visual cortex, we examined how intrinsic dynamic fluctuations in synaptic currents modify the effect of strong recurrent excitation on orientation selectivity. Previously, we showed that, using a s...
Timewarp: How your brain creates the fourth dimension
... suggest that the brain naturally slices our visual perception into a succession of snapshots. So in 2006, Rufin VanRullen, a neuroscientist at the University of Toulouse in France, decided to recreate the illusion in his lab. Sure enough, wh...
A model of the perception limits of the human visual system is presented, resulting in an estimate of approximately 15 million variable resolution pixels per eye. Assuming a 60 Hz stereo display with a depth complexity of 6, we make the prediction th...
Psilocybin slows binocular rivalry switching through serotonin modulation
Binocular rivalry refers to the fluctuations in visual awareness/suppression that occur when different images are simultaneously presented to each eye. To explore the role of serotonin (5-HT) in binocular rivalry, this study investigated the affects ...
The Control Interrupt Model of Psychedelic Action
... or phantom tingling and throbbing; in visual networks it may be perceived as phosphenes, or strobing or pulsating of light intensity, possibly fast enough to produce geometric hallucinations (Fig. 1); in audio networks it may be perceived...
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