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Finding a new target in an old display: evidence for a memory recency effect in visual search
Christof Körner1, Iain D Gilchrist
1Institut für Psychologie, University of Graz, Graz, Austria. christof.koerner@uni-graz.at
Psychonomic Bulletin & Review
|December 20, 2007
Summary
Previous exposure to a visual search environment enhances subsequent target identification. This study shows that recent fixations on items, including distractors, influence search efficiency and memory in visual search tasks.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- Visual search tasks frequently require individuals to locate multiple targets within the same environment sequentially.
- Understanding how prior exposure influences search efficiency is crucial for optimizing visual search strategies.
Purpose of the Study:
- To investigate the benefits of previous exposure on visual search performance.
- To examine the role of fixation recency and memory in repeated visual search environments.
Main Methods:
- Participants performed consecutive visual searches for different targets in the same display.
- Manual response times and eye movement data (fixations) were recorded.
- Analysis focused on the impact of previous search history on current search efficiency.
Main Results:
- Manual search responses were significantly faster in the second search compared to the first, irrespective of target presence.
- Target identification time in the second search was influenced by the recency of its last fixation in the prior search, with effects lasting approximately four fixations.
- During target-absent trials in the second search, recently fixated distractors were less likely to be refixated, and refixations occurred later.
Conclusions:
- Prior exposure and recent fixation history create a limited-capacity short-term memory store that benefits visual search.
- This memory store influences both target identification speed and distractor processing, reducing inefficient refixations.
