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Todd W Thompson1,2, Michael L Waskom1,3, John D E Gabrieli1

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Intensive cognitive training expands working memory capacity by altering neural networks. This study reveals how brain activity in frontoparietal networks changes with working memory load after training.

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Area of Science:

  • Cognitive neuroscience
  • Neuroimaging
  • Human cognition

Background:

  • Working memory is crucial for cognitive functions.
  • Intensive cognitive training can enhance working memory capacity.
  • Neural mechanisms underlying training-induced working memory improvements are not fully understood.

Purpose of the Study:

  • To investigate neural plasticity in working memory following intensive cognitive training.
  • To examine how functional brain networks adapt to increased working memory load after training.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants underwent 20 days of either dual n-back or visuospatial attention training.
  • Neural activation and functional connectivity were analyzed before and after training.

Main Results:

  • Task-specific improvements in working memory performance were observed.
  • Training altered the relationship between working memory load and brain activation in frontoparietal networks (executive control network and dorsal attention network).
  • Increased functional connectivity within and between these networks correlated with performance gains.

Conclusions:

  • Intensive cognitive training induces adaptive changes in neural systems supporting working memory.
  • Dissociation and altered load-dependent activation in frontoparietal networks are key to working memory enhancement.
  • Functional connectivity changes reflect the neural basis for improved working memory capacity.