Spatiotemporal Segregation in Visual Search: Evidence from Parietal Lesions

Autor/inn/en	Olivers, Christian N. L.; Humphreys, Glyn W.
Titel	Spatiotemporal Segregation in Visual Search: Evidence from Parietal Lesions
Quelle	In: Journal of Experimental Psychology: Human Perception and Performance, 30 (2004) 4, S.667-688 (21 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0096-1523
Schlagwörter	Cues; Visual Stimuli; Cognitive Processes; Visual Discrimination; Minimal Brain Dysfunction; Spatial Ability; Psychological Studies + Suchen Sie Ihr Suchwort? Stichwort; Cognitive process; Kognitiver Prozess; Hirnfunktionsstörung; Räumliches Vorstellungsvermögen
Abstract	The mechanisms underlying segmentation and selection of visual stimuli over time were investigated in patients with posterior parietal damage. In a modified visual search task, a preview of old objects preceded search of a new set for a target while the old items remained. In Experiment 1, control participants ignored old and prioritized new items, but patients had severe difficulties finding the target (especially on the contralesional side). In Experiment 2, simplified displays yielded analogous results, ruling out search ease as a crucial factor in poor preview search. In Experiment 3, outlines around distractor groups (to aid segmentation) improved conjunction but not preview search, suggesting a specific deficit in spatiotemporal segmentation. Experiment 4 ruled out spatial disengagement problems as a factor. The data emphasize the role of spatiotemporal segmentation cues in preview search and the parietal lobe in the role of these cues to prioritize search of new stimuli. (Author).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10