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Components of the location probability effect in visual search tasks.
1Department of Psychology, University of California, San Diego, La Jolla 92093.
Summary
Target detection is faster in frequently used locations. This effect depends on both spatial position and relative location within a display, influenced by attentional spotlight and specific detectors.
Area of Science:
- Cognitive Psychology
- Visual Perception
- Human-Computer Interaction
Background:
- Visual search performance is influenced by the predictability of target locations.
- Prior research indicates that targets are detected faster in frequently cued locations.
Purpose of the Study:
- To investigate the properties of the location probability effect in visual search.
- To determine if the effect depends on absolute spatial location or relative position within a display.
- To examine the role of target identity in the location probability effect.
Main Methods:
- Five experiments were conducted manipulating stimulus presentation and target properties.
- Experiment 1 varied spatial location versus relative position to assess their influence.
- Experiment 2 differentiated between inducing and test targets to explore target identity effects.
Main Results:
- Both spatial location and relative position showed similar facilitation effects.
- Targets were detected faster in high-probability locations, with a stronger effect for inducing targets.
- Results suggest a combined influence of spatial attention and position-specific processing.
Conclusions:
- The location probability effect in visual search is multifaceted.
- It is driven by both general spatial attention and specific feature-based detectors.
- These findings inform models of visual attention and information processing.