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Parallel memory retrieval in dual-task situations: I. Semantic memory.

G D Logan1, M D Schulkind

  • 1Department of Psychology, University of Illinois, Champaign 61820, USA. glogan@s.psych.uiuc.edu

Journal of Experimental Psychology. Human Perception and Performance
|July 7, 2000
PubMed
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Participants can retrieve information about a second stimulus while processing the first, especially when stimuli share a category. This parallel processing, termed the category-match effect, depends on maintaining the same task for both stimuli.

Area of Science:

  • Cognitive Psychology
  • Human Information Processing

Background:

  • Investigating the capacity for simultaneous information retrieval from working memory.
  • Exploring the phenomenon of parallel processing in cognitive tasks.

Purpose of the Study:

  • To determine if individuals can access information about a second stimulus during the processing of a first stimulus.
  • To examine the conditions under which parallel retrieval occurs.

Main Methods:

  • Four experiments were conducted using tasks such as letter-digit discrimination, digit judgments (magnitude, parity), and lexical decisions.
  • Reaction times were measured to assess the impact of category-matching between successive stimuli.
  • The influence of task set consistency on the category-match effect was investigated.

Related Experiment Videos

Main Results:

  • A category-match effect was observed: reaction times to the first stimulus were faster when it shared a category with the second stimulus.
  • This effect was consistent across various discrimination and decision tasks.
  • Semantic priming from the second to the first stimulus was also demonstrated.
  • Crucially, the category-match effect was contingent on performing the same task for both stimuli; it disappeared when the task changed.

Conclusions:

  • Evidence supports the capability for parallel information retrieval, allowing access to a second stimulus's information during first stimulus processing.
  • The task set must remain consistent between stimuli for this parallel retrieval, indicated by the category-match effect, to manifest.
  • This task-set dependency offers a potential explanation for prior difficulties in observing parallel retrieval phenomena.