Visual search for targets on natural textured backgrounds.

Green, P R, Willis, Alexandra and Egan, Christopher D (2009) Visual search for targets on natural textured backgrounds. Perception: ECVP abstract supplement, 38. p. 41. ISSN 0301-0066

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Little is known about visual search for targets on natural, textured backgrounds, or about the capacity of biological camouflage patterns to provide protection across a range of backgrounds. The experiments described address both these problems. Observers searched under diffuse daylight for a camouflaged target on a flat, natural surface, subtending approximately 35 × 20°, while wearing a lightweight portable eye tracker. The targets were life-size images of four different moth species, varying in luminance contrast and size of pattern elements. They were printed on paper and cut out. Two backgrounds were approximately uniform in colour (paving slabs, stucco wall), while two consisted of distinct objects varying in colour (stone chips, dead leaves). The identity, position, and orientation of the target varied randomly between trials. The background had a significant effect on search time, which was longest for the stucco wall, and shortest for the paved surface. The rank ordering of difficulty of search on the four backgrounds could not be explained by differences in first-order properties (mean luminance, contrast) between their images and those of the moths, nor by the strength of luminance gradients at the outlines of the moths. The results suggest that search follows segregation of a scene into distinct solid elements

Item Type: Article
Print ISSN: 0301-0066
Uncontrolled Keywords: Visual search; biological camouflage;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Health and Social Sciences
Dewey Decimal Subjects: 100 Philosophy & psychology > 150 Psychology > 152 Perception, movement, emotions & drives
Library of Congress Subjects: B Philosophy. Psychology. Religion > BF Psychology
Item ID: 4889
Depositing User: Mrs Lyn Gibson
Date Deposited: 16 Jan 2012 15:08
Last Modified: 18 Jun 2012 12:33

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