Guided search: An alternative to the feature integration model for visual search.

Subjects searched sets of items for targets defined by conjunctions of color and form, color and orientation, or color and size. Set size was varied and reaction times (RTs) were measured. For many unpracticed subjects, the slopes of the resulting RT?×?Set Size functions are too shallow to be consistent with A. Treisman's (see record 1988-00255-001) and A. Treisman and G. Gelade's (see record 1980-04680-001) feature integration model, which proposes serial, self-terminating search for conjunctions. Searches for triple conjunctions (Color?×?Size?×?Form) are easier than searches for standard conjunctions and can be independent of set size. A guided search model similar to J. E. Hoffman's (see record 1981-04707-001) two-stage model can account for these data. In the model, parallel processes use information about simple features to guide attention in the search for conjunctions. Triple conjunctions are found more efficiently than standard conjunctions because three parallel processes can guide attention more effectively than two. (PsycINFO Database Record (c) 2010 APA, all rights reserved)