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Geometric visual hallucinations, Euclidean symmetry and the functional architecture of striate cortex

This paper is concerned with a striking visual experience: that of seeing geometric visual hallucinations. Hallucinatory images were classified by Klu ver into four groups called form constants comprising (i) gratings, lattices, fretworks, ¢ligrees, honeycombs and chequer-boards, (ii) cobwebs, (iii) tunnels, funnels, alleys, cones and vessels, and (iv) spirals.

math.utah.edu/~bresslof/public

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