Related Experiment Video
Updated: Jun 25, 2026
09:27
Using Eye Movements Recorded in the Visual World Paradigm to Explore the Online Processing of Spoken Language
Published on: October 13, 2018
Feature head-start: Conjunction search following progressive feature disclosure
Elizabeth S Olds1, Timothy J Graham, Jeffery A Jones
1Department of Psychology, Centre for Cognitive Neuroscience, Wilfrid Laurier University, 75 University Avenue West, Waterloo, Ontario, Canada N2L 3C5. eolds@wlu.ca
Vision Research
|February 25, 2009
Summary
Feature previews can speed up or slow down visual search, depending on the feature (size, color, orientation) and potential display disruptions. Size previews offer the most search facilitation, while orientation previews are least effective.
Area of Science:
- Cognitive Psychology
- Visual Perception
Background:
- Visual search tasks often involve identifying targets defined by conjunctions of features (e.g., color and orientation).
- Feature previews, where one feature of the upcoming search item is presented beforehand, can influence search efficiency.
Purpose of the Study:
- To investigate the predictive power of feature search speed on feature-preview effectiveness in conjunction visual search.
- To determine which visual features (color, orientation, size) provide the most facilitation when used as a preview.
Main Methods:
- Participants performed conjunction visual search tasks preceded by feature-preview displays.
- Search performance (speed and accuracy) was measured under different preview conditions (color, orientation, size).
- Feature search performance was equated across conditions to isolate preview effects.
Main Results:
- Size previews consistently facilitated search more than color or orientation previews.
- Color and orientation previews showed variable effects, sometimes facilitating and sometimes disrupting search.
- The ease of feature search did not predict the degree of facilitation from a feature preview.
Conclusions:
- Feature-preview effectiveness is not solely determined by the speed of feature-defined search.
- Both facilitation and disruption effects contribute to the overall impact of feature previews on visual search.
- Size appears to be the most robust feature for preview-based facilitation in conjunction search.
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