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Journal Article

The flip tilt illusion: visible in peripheral vision as predictedby the Central-Peripheral Dichotomy (CPD)

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Zhaoping, L
Department of Sensory and Sensorimotor Systems, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Zhaoping, L. (in press). The flip tilt illusion: visible in peripheral vision as predictedby the Central-Peripheral Dichotomy (CPD). i-Perception.

Abstract

Consider a gray field comprising pairs of vertically aligneddots; in each pair, one dot is whitethe other black. When viewed in a peripheral visual field, these pairs appear horizontally aligned.By the Central-Peripheral Dichotomy, this flip tilt illusion arises because top-down feedback fromhigher to lower visual cortical areas is too weak or absent inthe periphery to veto confoundedfeedforward signals from the primary visual cortex (V1). The white and black dots in each pairactivate, respectively, on and off subfields of V1 neural receptive fields (RF). However, the sub-fields’ orientations, and the preferred orientations, of the most activated neurons are orthogonal tothe dot alignment. Hence, V1 reports the flip tilt to higher visual areas. Top-down feedback vetoessuch misleading reports, but only in the central visual field.