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Related Experiment Videos

Serial attention within working memory

H Garavan1

  • 1Medical College of Wisconsin, Milwaukee 53226, USA. hgaravan@mcw.edu

Memory & Cognition
|May 19, 1998
PubMed
Summary
This summary is machine-generated.

Cognitive tasks require switching attention between items in working memory (WM). Even with practice, switching incurs a time cost, suggesting a dedicated attention-switching mechanism.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Attention Studies

Background:

  • Working memory (WM) is proposed to hold a limited capacity of information, often conceptualized as discrete 'objects'.
  • Many cognitive processes and daily activities require frequent shifts of attention between these WM objects.
  • Understanding the efficiency and mechanisms of attentional switching within WM is crucial for cognitive models.

Purpose of the Study:

  • To measure the time cost associated with switching attention between objects held in working memory.
  • To investigate the underlying cognitive processes responsible for these attentional switches.
  • To differentiate a dedicated switching mechanism from alternative explanations like priming or retrieval.

Main Methods:

  • Two experiments were designed where participants maintained and updated two concurrent running counts.

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  • The task design necessitated frequent alternations (switches) in attention between the two counts.
  • Performance was compared between trials requiring a switch and trials updating the same count consecutively.

    • Main Results:

    • A significant time cost was observed when participants switched between updating the two counts, even after extensive practice.
    • This time cost persisted, indicating that intensive practice did not eliminate the switching penalty.
    • The findings support the existence of a distinct mechanism governing attentional focus within WM.

    Conclusions:

    • A dedicated switching mechanism appears to control a limited internal focus of attention, capable of engaging only one WM object at a time.
    • This attentional bottleneck is a key component of working memory capacity.
    • The results provide evidence against simpler explanations such as repetition priming or memory retrieval as the sole cause of the switching cost.