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Context superiority in a detection task with line-element stimuli: A low-level effect

Measured detection and identification performances for vertical and horizontal target elements embedded within an array of oriented noise elements as a function of the orientation difference between the target and noise elements. Detection performances obtained with 1 vertical and 3 horizontal target elements clustered together to form a schematic face-like pattern were significantly better than those obtained with the same clustered target elements displayed in an arbitrary, symmetrical or asymmetrical, configuration. Probability summation calculations based on the detection results obtained with one target element predict detection thresholds that are intermediate between those of clustered and dispersed targets. The existence of a context(face)-superiority effect at the detection level indicates top-down/bottom-up interactions between remote visual processing stages. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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