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Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex
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Cognitive control signals in posterior cingulate cortex.

Benjamin Y Hayden1, David V Smith, Michael L Platt

  • 1Department of Neurobiology, Duke University School of Medicine Durham, NC, USA.

Frontiers in Human Neuroscience
|December 17, 2010
PubMed
Summary
This summary is machine-generated.

Switching between tasks requires cognitive control, involving suppression of activity in the posterior cingulate cortex (CGp), a key part of the default network. This suppression aids cognitive control by reducing competing neural processes.

Keywords:
default networkexecutive functionlateral intraparietal cortextask-switching

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • Cognitive control enables efficient task switching.
  • The default network's role in cognitive control is not well understood.
  • The default network exhibits high baseline activity that decreases during task engagement.

Purpose of the Study:

  • To investigate the role of the posterior cingulate cortex (CGp), a default network node, in cognitive control during task switching.
  • To test the hypothesis that task switching requires suppression of CGp neuronal activity.

Main Methods:

  • Single-neuron recordings were conducted in the CGp of monkeys performing two interleaved tasks.
  • Neuronal activity was monitored during task performance and switches.
  • Activity in the lateral intraparietal cortex was also recorded for comparison.

Main Results:

  • Neuronal activity in the CGp decreased after switching tasks and gradually returned to baseline.
  • This suppression of CGp activity was linked to cognitive control demands.
  • No similar activity changes were observed in the lateral intraparietal cortex.

Conclusions:

  • Suppression of neuronal activity in the CGp is crucial for effective cognitive control during task switching.
  • The default network's activity may directly compete with brain processes supporting cognitive control.
  • These findings shed light on the neural mechanisms underlying cognitive flexibility.