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Illusory bands in orientation and spatial frequency: a cortical analog to Mach bands
Edward A Essock1, Bruce C Hansen, Andrew M Haun
1Department of Psychological and Brain Sciences, University of Louisville, Louisville, KY 40292, USA. essock@louisville.edu
Abstract:
Illusory bands at a luminance transition in space (ie an edge) are well known. Here we demonstrate illusory bands of enhanced orientations or spatial frequencies at transitions between higher-contrast and lower-contrast image content along the orientation and spatial-frequency dimensions--the dimensions of cortical spatial coding. We conclude that this illusion is a consequence of cortical-level suppression of units of similar orientations and spatial frequencies and serves to aid texture segmentation while providing efficient neural coding.
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