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Related Experiment Videos

Redefining the functional organization of working memory processes within human lateral prefrontal cortex.

A M Owen1, N J Herrod, D K Menon

  • 1MRC Cognition and Brain Sciences Unit, Cambridge, UK. adrian.owen@mrc-cbu.cam.ac.uk

The European Journal of Neuroscience
|March 3, 1999
PubMed
Summary

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The frontal cortex

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Function

Background:

  • The frontal cortex is crucial for working memory.
  • A key question is whether its subdivisions process information differently.
  • Previous assumptions linked frontal regions to specific memory types (spatial/non-spatial).

Purpose of the Study:

  • To investigate functional distinctions within the lateral frontal cortex for working memory.
  • To determine if frontal subdivisions are organized by processing type or information nature.
  • To clarify the roles of mid-dorsolateral and mid-ventrolateral frontal regions in spatial working memory.

Main Methods:

  • Positron emission tomography (PET) was used to measure brain activity.
  • Two spatial working memory tasks were employed: 'spatial span' and '2-back'.

Related Experiment Videos

  • Tasks differed in executive processing demands, specifically information manipulation and updating.

    • Main Results:

    • The 'spatial span' task (holding locations) activated the right mid-ventrolateral frontal cortex.
    • The '2-back' task (updating locations) activated both mid-ventrolateral and mid-dorsolateral frontal regions.
    • Information manipulation, emphasized in the '2-back' task, uniquely increased activity in the right mid-dorsolateral frontal cortex.

    Conclusions:

    • Mid-dorsolateral and mid-ventrolateral frontal areas have distinct functional roles in spatial working memory.
    • Working memory processes are fractionated based on processing demands, not solely on information type.
    • This study refines our understanding of frontal lobe organization for executive functions.