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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
3
|
| pubmed:dateCreated |
1985-10-23
|
| pubmed:abstractText |
The search rate for a target among distractors may vary dramatically depending on which stimulus plays the role of target and which that of distractors. For example, the time required to find a circle distinguished by an intersecting line is independent of the number of regular circles in the display, whereas the time to find a regular circle among circles with lines increases linearly with the number of distractors. The pattern of performance suggests parallel processing when the target has a unique distinguishing feature and serial self-terminating search when the target is distinguished only by the absence of a feature that is present in all the distractors. The results are consistent with feature-integration theory (Treisman & Gelade, 1980), which predicts that a single feature should be detected by the mere presence of activity in the relevant feature map, whereas tasks that require subjects to locate multiple instances of a feature demand focused attention. Search asymmetries may therefore offer a new diagnostic to identify the primitive features of early vision. Several candidate features are examined in this article: Colors, line ends or terminators, and closure (in the sense of a partly or wholly enclosed area) appear to be functional features; connectedness, intactness (absence of an intersecting line), and acute angles do not.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
Sep
|
| pubmed:issn |
0096-3445
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
114
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
285-310
|
| pubmed:dateRevised |
2006-11-15
|
| pubmed:meshHeading |
pubmed-meshheading:3161978-Adult,
pubmed-meshheading:3161978-Attention,
pubmed-meshheading:3161978-Color Perception,
pubmed-meshheading:3161978-Discrimination Learning,
pubmed-meshheading:3161978-Dominance, Cerebral,
pubmed-meshheading:3161978-Female,
pubmed-meshheading:3161978-Form Perception,
pubmed-meshheading:3161978-Humans,
pubmed-meshheading:3161978-Male,
pubmed-meshheading:3161978-Orientation,
pubmed-meshheading:3161978-Visual Perception
|
| pubmed:year |
1985
|
| pubmed:articleTitle |
Search asymmetry: a diagnostic for preattentive processing of separable features.
|
| pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
|