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Related Experiment Videos

Common neural substrates for visual working memory and attention.

Jutta S Mayer1, Robert A Bittner, Danko Nikolić

  • 1Department of Psychiatry, Johann Wolfgang Goethe-University, Heinrich-Hoffmann-Str. 10, 60528 Frankfurt, Germany. jutta.mayer@kgu.de

Neuroimage
|April 28, 2007
PubMed
Summary
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Limited visual memory arises from shared neural resources between visual working memory (WM) and selective attention. Competition for these common brain areas restricts processing capabilities.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Human visual working memory (WM) capacity is limited.
  • Selective attention is a potential limiting factor in visual WM performance.

Purpose of the Study:

  • To investigate if visual working memory (WM) and selective attention share common neural resources.
  • To test the hypothesis that limitations in visual memory result from this neural overlap.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Participants performed visual search and delayed discrimination tasks with modulated attentional and WM demands.
  • Complex objects were used for encoding into visual WM.

Main Results:

  • Overlapping brain activation for visual search and WM encoding was found in frontal and posterior regions.

Related Experiment Videos

  • Additive increases in activation were observed in the right prefrontal cortex and bilateral insula with increased WM load and attention.
  • Some brain regions showed reduced WM responses under high attentional demand, indicating resource competition.

    • Conclusions:

    • Encoding into visual WM and selective attention heavily rely on shared neural resources.
    • Competition for these common resources in attention and WM encoding limits processing in posterior brain regions.