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Modeling the Functional Network for Spatial Navigation in the Human Brain
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The brain's default mode network.

Marcus E Raichle1

  • 1Washington University School of Medicine, St. Louis, Missouri 63110;

Annual Review of Neuroscience
|May 5, 2015
PubMed
Summary
This summary is machine-generated.

The brain's default mode network, a set of brain regions, shows decreased activity during tasks compared to rest. This finding is crucial for understanding brain function in health and disease.

Keywords:
activationattentionbaselinefunctional connectivityintrinsic activitymemoryresting stateself

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • The default mode network (DMN) comprises distinct cortical regions in the medial and lateral parietal, medial prefrontal, and temporal cortices.
  • The DMN is conserved across species, including humans, nonhuman primates, cats, and rodents.

Purpose of the Study:

  • To investigate the functional significance of the brain's intrinsic activity.
  • To highlight the role of the default mode network in resting-state studies.

Main Methods:

  • Discovery through positron emission tomography (PET) brain-imaging studies.
  • Comparison of brain activity during attention-demanding tasks versus states of quiet repose (eyes closed or visual fixation).

Main Results:

  • The default mode network consistently shows decreased activity during task performance when compared to resting states.
  • This observation revitalized interest in the brain's ongoing, intrinsic neural activity.

Conclusions:

  • Resting-state studies, focusing on intrinsic brain activity, are now central to neuroscience research.
  • The default mode network is a key component in understanding brain function and dysfunction in various conditions.