Spatial Vision , Vol. 17, No. 4-5, pp. 543 – 557 (2004) VSP 2004. Also available online - www.vsppub.com Varied-mapping conjunction search: Evidence for rule-based learning CHARLES T. SCIALFA ∗ , LISA MCPHEE and GEOFFREY HO Department of Psychology, University of Calgary, 2500 University Drive NW, Calgary AB, T2N 1N4, Canada Received 5 May 2003; revised 19 August 2003; accepted 27 November 2003 Abstract —Five experiments were carried out to examine whether top-down processes can aid search, even when targets and distractors are variably mapped. Experiments 1a and 1b determined that ef- fortless VM search can be obtained in Contrast Polarity X Orientation and Color X Orientation con- junction search when one feature dimension remains consistently mapped across blocks. Experiment 2 showed that efficient VM search is possible when both dimensions are variably mapped. In Ex- periment 3, efficient VM search was found when target–distractor reversals occurred on a trial-wise basis. Experiments 4 and 5 found that VM search deteriorates when target identity is not known prior to display onset. These studies demonstrate the role of top-down mechanisms in the development of efficient VM search and present several challenges to strength-theoretic views on the mechanisms underlying automaticity.
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 2004
Keywords: VISUAL SEARCH; ATTENTION; AUTOMATICITY
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