Spontaneous excitations in the visual cortex: stripes, spirals, rings, and collective bursts

As a simple model of the cortical sheet, we study a locally connected net of spiking neurons. Refractoriness, noise, axonal delays, and the time course of excitatory and inhibitory postsynaptic potentials are taken into account explicitly. In addition to a low-activity state and depending on the syn...

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Bibliographic Details
Published in:	Neural computation Vol. 7; no. 5; p. 905
Main Authors:	Fohlmeister, C, Gerstner, W, Ritz, R, van Hemmen, J L
Format:	Journal Article
Language:	English
Published:	United States 01-09-1995
Subjects:	Action Potentials Animals Brain Mapping Hallucinations - chemically induced Hallucinations - physiopathology Hallucinations - psychology Hallucinogens - adverse effects Hallucinogens - pharmacology Humans Ketamine - adverse effects Ketamine - pharmacology Lysergic Acid Diethylamide - adverse effects Lysergic Acid Diethylamide - pharmacology Models, Neurological Models, Psychological Nerve Net Neurons - physiology Penicillins - pharmacology Penicillins - toxicity Rabbits Retina Seizures - chemically induced Seizures - physiopathology Seizures - psychology Synaptic Transmission Visual Cortex - drug effects Visual Cortex - physiology
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Summary:	As a simple model of the cortical sheet, we study a locally connected net of spiking neurons. Refractoriness, noise, axonal delays, and the time course of excitatory and inhibitory postsynaptic potentials are taken into account explicitly. In addition to a low-activity state and depending on the synaptic efficacy, four different scenarios evolve spontaneously, viz., stripes, spirals, rings, and collective bursts. Our results can be related to experimental observations of drug-induced epilepsy and hallucinations.
ISSN:	0899-7667
DOI:	10.1162/neco.1995.7.5.905