title: The horizontal effect in suppression: Anisotropic overlay and surround suppression at high and low speeds.
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.
authors.affiliation: Department of Psychological and Brain Sciences, University of Louisville, Louisville, KY 40292, USA.
authors.forename: Yeon Jin
authors.initials: YJ
authors.lastname: Kim
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Haun
authors.forename: Edward A
authors.initials: EA
authors.lastname: Essock
mesh_terms: D000704:Analysis of Variance; D016880:Anisotropy; D006801:Humans; D009622:Noise; D009949:Orientation; D010364:Pattern Recognition, Visual / Q000502:physiology; D010470:Perceptual Masking; D010775:Photic Stimulation / Q000379:methods; D012684:Sensory Thresholds / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*