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Related Experiment Videos

Maintenance and manipulation in spatial working memory: dissociations in the prefrontal cortex.

D C Glahn, J Kim, M S Cohen

    Neuroimage
    |December 17, 2002
    PubMed
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    This study investigated spatial working memory in the prefrontal cortex. Dorsolateral prefrontal cortex handles manipulation, superior frontal sulcus aids maintenance, and ventrolateral prefrontal cortex shows complex roles.

    Area of Science:

    • Neuroscience
    • Cognitive Neuroscience
    • Neuroimaging

    Background:

    • The prefrontal cortex is crucial for executive functions, including spatial working memory.
    • Understanding the specific roles of prefrontal cortex subregions in spatial working memory is essential.

    Purpose of the Study:

    • To compare theories on the functional organization of spatial working memory in the human prefrontal cortex.
    • To delineate the distinct contributions of dorsolateral, superior frontal sulcal, and ventrolateral prefrontal regions.

    Main Methods:

    • Two fMRI experiments were conducted to assess brain activity.
    • Experiment I parametrically varied memory set size for locations.
    • Experiment II contrasted manipulation of spatial information with its maintenance.

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    Main Results:

    • A distributed spatial working memory network was activated.
    • Dorsolateral prefrontal cortex (DLPFC) activation increased with memory set size and was engaged during manipulation.
    • Superior frontal sulcal (SFS) activation correlated with spatial information maintenance.
    • Ventrolateral prefrontal cortex (VLPFC) showed activation only at high memory loads, suggesting strategic processing.

    Conclusions:

    • Results support DLPFC's role in manipulating internal representations.
    • Findings indicate SFS involvement in maintaining spatial information.
    • The study suggests a complex and load-dependent role for VLPFC in spatial working memory.