15971688

Source:http://linkedlifedata.com/resource/pubmed/id/15971688

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0234621, umls-concept:C1552603, umls-concept:C1706202, umls-concept:C1959633
pubmed:issue	2
pubmed:dateCreated	2005-6-23
pubmed:abstractText	Two types of mechanisms have dominated theoretical accounts of efficient visual search. The first are bottom-up processes related to the characteristics of retinotopic feature maps. The second are top-down mechanisms related to feature selection. To expose the potential involvement of other mechanisms, we introduce a new search paradigm whereby a target is defined only in a context-dependent manner by multiple conjunctions of feature dimensions. Because targets in a multiconjunction task cannot be distinguished from distractors either by bottom-up guidance or top-down guidance, current theories of visual search predict inefficient search. While inefficient search does occur for the multiple conjunctions of orientation with color or luminance, we find efficient search for multiple conjunctions of luminance/size, luminance/shape, and luminance/topology. We also show that repeated presentations of either targets or a set of distractors result in much faster performance and that bottom-up feature extraction and top-down selection cannot account for efficient search on their own. In light of this, we discuss the possible role of perceptual organization in visual search. Furthermore, multiconjunction search could provide a new method for investigating perceptual grouping in visual search.
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/0200445
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Feb
pubmed:issn	0031-5117
pubmed:author	pubmed-author:KristjanssonArniA, pubmed-author:NakayamaKenK, pubmed-author:WangDeLiangD
pubmed:issnType	Print
pubmed:volume	67
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	239-53
pubmed:dateRevised	2006-11-15
pubmed:meshHeading	pubmed-meshheading:15971688-Form Perception, pubmed-meshheading:15971688-Humans, pubmed-meshheading:15971688-Light, pubmed-meshheading:15971688-Reaction Time, pubmed-meshheading:15971688-Size Perception, pubmed-meshheading:15971688-Visual Perception
pubmed:year	2005
pubmed:articleTitle	Efficient visual search without top-down or bottom-up guidance.
pubmed:affiliation	Center for Cognitive Science, Department of Computer Science and Engineering, Ohio State University, Columbus, OH 43210, USA. dwang@cse.ohio-state.edu
pubmed:publicationType	Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't