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Updated: Jun 16, 2026

The Measurement and Treatment of Suppression in Amblyopia
Published on: December 14, 2012
The horizontal effect in suppression: Anisotropic overlay and surround suppression at high and low speeds
Yeon Jin Kim1, Andrew M Haun, Edward A Essock
1Department of Psychological and Brain Sciences, University of Louisville, Louisville, KY 40292, USA.
Abstract:
When a pattern of broad spatial content is viewed by an observer, the multiple spatial components in the pattern stimulate detecting-mechanisms that suppress each other. This suppression is anisotropic, being relatively greater at horizontal, and least at obliques (the "horizontal effect"). Here, suppression of a grating by a naturalistic (1/f) broadband mask is shown to be larger when the broadband masks are temporally similar to the target's temporal properties, and generally anisotropic, with the anisotropy present across all spatio-temporal parings tested. We also show that both suppression from within the region of the test pattern (overlay suppression) and from outside of this region (surround suppression) show the horizontal-effect anisotropy. We conclude that these suppression effects stem from locally-tuned and anisotropically-weighted gain-control pools.
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