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Visual working memory load does not affect the overall stimulus processing time in visual search.

Keyun Xin1, Zhi Li1

  • 1Department of Psychology and Behavioral Sciences, Zhejiang University, Hangzhou, P.R. China.

Quarterly Journal of Experimental Psychology (2006)
|September 26, 2019
PubMed
Summary
This summary is machine-generated.

Visual working memory load delays response time in visual search but does not impact search efficiency. This study indicates memory load affects response selection, not stimulus processing during visual search.

Keywords:
Visual searchresponse timethreshold stimulus exposure durationvisual working memory

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Perception

Background:

  • The dual-task paradigm examines visual search and working memory interactions.
  • Working memory load typically slows response time (RT) in visual search without altering search efficiency.
  • Competing hypotheses explain this RT delay: response selection factors versus direct effects on visual search processing.

Purpose of the Study:

  • To investigate whether visual working memory load affects visual search processing time or response selection.
  • To differentiate between two main hypotheses explaining the impact of memory load on visual search RT.

Main Methods:

  • Utilized the threshold stimulus exposure duration (TSED) method to measure processing time.
  • Employed a dual-task paradigm combining visual search with varying working memory loads.
  • Conducted three experiments with different control levels and measurement techniques.

Main Results:

  • Experiment 1 showed a small TSED difference, contrasting with a large RT difference.
  • Experiment 2 found no significant TSED difference when manipulating working memory load.
  • Experiment 3 confirmed TSED is independent of response selection processes.

Conclusions:

  • Visual working memory load does not influence the stimulus processing time during visual search.
  • The observed delay in overall response time is primarily attributable to factors within the response selection stage, not visual search itself.