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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
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The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
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Resting Potential Decay01:15

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Atomic Nuclei: Nuclear Relaxation Processes01:23

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Related Experiment Video

Updated: Jul 16, 2026

Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
10:43

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Published on: July 1, 2014

Unrest at rest: default activity and spontaneous network correlations.

Randy L Buckner1, Justin L Vincent

  • 1Department of Psychology, Center for Brain Science, Harvard University, and Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Cambridge 02138, USA. rbuckner@wjh.harvard.edu

Neuroimage
|March 21, 2007
PubMed
Summary

Brain activity during rest, particularly in the default network, shows structured patterns. These patterns may be crucial for cognitive functions and understanding neurological conditions.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • Empirical observations reveal structured neural activity patterns during passive task states.
  • The default network exhibits higher activity during rest compared to active tasks.
  • Spontaneous, coordinated activity within functional-anatomic networks persists even under anesthesia.

Discussion:

  • Resting-state activity patterns may support memory consolidation, brain state stabilization, and future preparation.
  • Aberrant rest activity patterns are implicated in clinical conditions like Alzheimer's disease and autism.
  • Spontaneous network correlations offer valuable tools for functional localization and comparative neuroanatomy.

Key Insights:

  • The brain exhibits organized, intrinsic activity during periods of rest.
  • Default network activity is a key indicator of passive brain states.
  • Resting-state functional connectivity provides insights into brain function and dysfunction.

Outlook:

  • Systematic exploration of rest activity is crucial for advancing neuroscience.
  • Understanding resting-state networks can lead to novel diagnostic and therapeutic strategies for neurological disorders.
  • Comparative analysis of resting-state networks across species can illuminate evolutionary principles of brain organization.