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Visual search for feature singletons: multiple mechanisms produce sequence effects in visual search
Dragan Rangelov1, Hermann J Müller, Michael Zehetleitner
1General and Experimental Psychology, Departmentof Psychology, Ludwig-Maximilians-Universität München, Munich, Germany. rangelov@psy.lmu.de
Journal of Vision
|August 6, 2013
Summary
Priming of pop-out (PoP) effects in visual search are hindered by dense displays, while dimension-repetition effects (DRE) remain consistent across varying display densities, suggesting distinct underlying mechanisms.
Area of Science:
- Cognitive Psychology
- Visual Perception
- Human Factors
Background:
- Visual search tasks involve identifying a target among distractors.
- Intertrial effects, such as priming of pop-out (PoP) and dimension-repetition effect (DRE), can influence reaction times.
- Display density, the number of items in a visual field, may impact these intertrial effects.
Purpose of the Study:
- To investigate how display density affects PoP and DRE in visual search.
- To determine if PoP and DRE are influenced by the number of distractors.
- To explore the underlying mechanisms of intertrial effects in visual search.
Main Methods:
- Two experiments were conducted using visual search tasks with varying display densities (sparse vs. dense).
- Experiment 1 manipulated distractor color variability to assess PoP.
- Experiment 2 examined DRE magnitude across different display densities with fixed distractors.
Main Results:
- Priming of pop-out (PoP) effects were significant only in sparse display conditions.
- Dimension-repetition effects (DRE) were observed with comparable magnitudes in both sparse and dense displays.
- A dissociation between PoP and DRE was found concerning display density.
Conclusions:
- The findings suggest multiple mechanisms underlie intertrial effects in visual search.
- Priming of pop-out appears to be specific to conditions with low target-distractor signal-to-noise ratios.
- Display density significantly modulates PoP but not DRE, indicating distinct processing pathways.
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