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Memory processes in multiple-target visual search.

Christof Körner1, Iain D Gilchrist

  • 1University of Bristol, 8 Woodland Road, Bristol, BS8 1TH, UK. christof.koerner@uni-graz.at

Psychological Research
|October 6, 2006
PubMed
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Searching for multiple targets in visual search tasks incurs a significant performance cost. Remembering the first target location increases reaction time and fixations, suggesting limited memory capacity.

Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Memory

Background:

  • Multiple-target visual search requires participants to remember the location of previously identified targets.
  • Previous research has explored visual search, but the specific costs associated with remembering target locations in multi-target searches are less understood.

Purpose of the Study:

  • To investigate the performance costs associated with remembering target locations during multiple-target visual search.
  • To identify the underlying mechanisms, specifically attentional deployment, contributing to these costs.

Main Methods:

  • Experiment 1 compared performance (reaction time, fixations, search function slope) in a multiple-target search task with a conventional present-absent search task.
  • Experiment 2 analyzed refixations of distractors as a measure of attentional deployment during the multiple-target search.

Related Experiment Videos

Main Results:

  • A substantial performance cost was observed in the multiple-target search task compared to the conventional task.
  • This cost was primarily attributed to an increased number of refixations on previously visited distractors, evident from the beginning of the search.

Conclusions:

  • The findings support the concept of limited capacity memory processes influencing visual search.
  • The necessity of maintaining a target-allocating memory may consume cognitive resources, impacting distractor processing and overall search efficiency.