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Related Experiment Videos

Increased neural efficiency with repeated performance of a working memory task is information-type dependent.

Seema Sayala1, Joseph B Sala, Susan M Courtney

  • 1Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|August 5, 2005
PubMed
Summary

Spatial working memory (WM) task repetition improves efficiency in maintaining information and filtering distractions. This effect is specific to spatial tasks, suggesting distinct neural systems for object and spatial information maintenance in WM.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Working memory (WM) tasks are thought to require ongoing cognitive control, unlike automatic stimulus-response tasks.
  • Previous research on WM task repetition suggests continued engagement of control processes.
  • It remains unclear if neural changes reflect general control alterations or task-specific processes.

Purpose of the Study:

  • To investigate neural activity changes during repeated object and spatial WM tasks.
  • To determine if repetition effects are specific to the type of information (object vs. spatial).
  • To explore the neural basis of information maintenance and filtering in WM.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Participants performed repeated object and spatial delayed recognition tasks.

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  • Brain activation was analyzed across sample, delay, and test periods.

    • Main Results:

    • Decreased fMRI activation was observed in spatial and object-selective areas after spatial WM task repetition, irrespective of performance.
    • Few brain areas showed altered activity following object WM task repetition.
    • Repetition effects were specific to the spatial WM task.

    Conclusions:

    • Spatial WM task repetition enhances the efficiency of maintaining relevant information and filtering irrelevant information.
    • The task specificity suggests differences in how object and spatial information are represented and maintained in WM.
    • Distinct neural systems likely support the maintenance of object and spatial information in working memory.