PMID: 486593Oct 1, 1979

A mathematical theory of visual hallucination patterns

Biological cybernetics
G B Ermentrout, Jack D Cowan


Neuronal activity in a two-dimensional net is analyzed in the neighborhood of an instability. Bifurcation theory and group theory are used to demonstrate the existence of a variety of doubly-periodic patterns, hexagons, rolls, etc., as solutions to the field equations for the net activity. It is suggested that these simple geometric patterns are the cortical concomitants of the "form constants" seen during visual hallucinosis.


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Related Concepts

Nerve Impulses
Hallucinations, Visual, Unformed
Resting Potentials
Neural Networks (Anatomic)
Neural Inhibition
Visual Cortex
Visual Fields

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