Abstract:
:The use of nonspatial attentional mechanisms in search tasks was investigated by presenting observers with stimuli that contained 4-12 elements located on a circle around the fixation point. The elements differed in one of six nonspatial 'dimensions', namely orientation, contrast, scale, number of cycles, 'shape', and place in the alphabet. The target element of the search task differed from trial to trial but was always presented to the observer as a nonspatial, visual cue. This cue was displayed either before the stimulus (precue) or after the stimulus (postcue). Whereas a precue creates optimal conditions for the use of nonspatial attentional mechanisms, a postcue precludes benefits from their use. The fact that performance was better in the case of precued stimuli than in the case of postcued stimuli indicates that observers employed nonspatial attentional mechanisms. In the final analysis, however, the effect of nonspatial attention reduces to spatial attention in combination with limited storage capacity.
journal_name
Perceptionjournal_title
Perceptionauthors
de Haan E,Lutz C,Noest AJdoi
10.1068/p250591subject
Has Abstractpub_date
1996-01-01 00:00:00pages
591-608issue
5eissn
0301-0066issn
1468-4233journal_volume
25pub_type
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