The role of spatial working memory in visual search efficiency

Oh, S.-H.; Kim, Min‐Shik · 2004 · OpenAlex-citations

DOI: 10.3758/bf03196570

archive: archived pipeline: cataloged verified

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Summary

This study investigates the specific role of spatial working memory in visual search efficiency, addressing conflicting theories regarding the interaction between attention and working memory. While many theories suggest that working memory aids visual search by biasing attention, Woodman, Vogel, and Luck (2001) argued that working memory plays an insignificant role, demonstrating that a nonspatial working memory load did not interfere with search performance. The authors hypothesized that this null result occurred because Woodman et al. used only nonspatial tasks, whereas visual search inherently relies on spatial processing. To test this, the study compared the interference effects of concurrent spatial versus nonspatial working memory loads on visual search tasks. The researchers conducted two experiments using a dual-task paradigm. In Experiment 1, participants performed a visual search task (identifying an upright L-shaped figure among distractors) while maintaining the spatial locations of four squares in working memory. In Experiment 2, a separate group performed the same visual search task while maintaining the colors of four squares (nonspatial information). Search set sizes varied (4, 8, or 12 items) to manipulate search difficulty. Performance was measured via search reaction times (RTs) and working memory accuracy. The results revealed a clear dissociation between spatial and nonspatial working memory. In Experiment 1, the spatial working memory load significantly impaired visual search efficiency, evidenced by a steeper search slope (increased RT per item) in the dual-task condition compared to the search-alone condition. Conversely, the visual search process impaired spatial working memory accuracy, with performance decreasing as search set size increased. In Experiment 2, the nonspatial working memory load did not impair search efficiency, and search set size did not significantly affect color memory accuracy. These findings indicate that visual search and spatial working memory compete for the same limited-capacity mechanisms, likely due to shared demands on spatial attention. The study concludes that spatial working memory is distinct from nonspatial working memory in its interaction with visual search. The interference observed suggests that efficient visual search requires the maintenance of spatial information in working memory, possibly through mechanisms like inhibitory tagging to prevent reinspection of searched locations. This challenges the generalization that working memory is irrelevant to visual search, implying instead that the type of working memory load matters. The findings support the view that spatial attention serves as a rehearsal mechanism for spatial working memory, and that visual search processes are specifically tied to spatial, rather than nonspatial, memory systems.

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• visual search