Journal
VISION RESEARCH
Volume 40, Issue 22, Pages 3099-3115Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0042-6989(00)00155-3
Keywords
shape; visual search; encoding
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Four visual search experiments are reported which used simple 2D shapes varying on the global dimensions of aspect ratio/curvature or aspect ratio/tapering. Results indicate serial self-terminating search in all conditions. Most importantly, search rates are markedly modulated by the particular forms of structural relations existing between the targets and their distracters. Thus, single-feature targets with shape properties that are linearly separable from those of their distracters yield markedly faster search rates than linearly separable targets made of a conjunction of distracter features. In addition, linearly separable single-feature targets are searched at a much faster rate than single-feature targets which are not linearly separable. Follow-up experiments demonstrate that these conjunction and linear non-separability effects cannot be attributed to pairwise target-distracter discriminability differences across conditions. The main conclusions are that the shapes used are parsed according to elementary features in visual encoding, and that a linear discrimination mechanism is available which permits fast visual search rates if a single-feature target is linearly separable from its distracters. (C) 2000 Elsevier Science Ltd. All rights reserved.
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