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Related Experiment Video

Updated: Jul 11, 2025

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Movement-related ERS and connectivity in the gamma frequency decrease with practice.

Elisa Tatti1, Alberto Cacciola2, Federico Carrara3

  • 1Department of Molecular, Cellular & Biomedical Sciences, CUNY, School of Medicine, New York, NY 10031, United States.

Neuroimage
|November 5, 2023
PubMed
Summary
This summary is machine-generated.

Motor practice and rest reduce movement-related gamma oscillations (brain activity) amplitude, suggesting fatigue or strategy changes rather than plasticity. Gamma oscillations remain scaled to movement velocity.

Keywords:
ConnectivityEvent-Related Synchronization (ERS)Gamma oscillationsMotor controlNeurorehabilitationReaching movements

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Movement is associated with electroencephalographic (EEG) activity modulation in beta and gamma frequency bands.
  • Beta event-related synchronization (ERS) increases with motor practice, while gamma ERS amplitude correlates with movement characteristics like distance and velocity.

Purpose of the Study:

  • To investigate the effects of motor practice and subsequent rest (sleep or quiet wake) on gamma ERS amplitude and connectivity during a motor reaching task.
  • To determine if changes in gamma oscillatory activity are linked to fatigue or strategy shifts during motor learning.

Main Methods:

  • High-density EEG was recorded in 51 healthy subjects during a motor reaching test.
  • Subjects underwent a three-hour learning task (motor or non-motor) followed by 90 minutes of either sleep or quiet rest.
  • Analysis focused on gamma ERS amplitude, connectivity patterns, and correlations with subjective fatigue.

Main Results:

  • Gamma ERS amplitude decreased after practice and after both rest conditions, independent of learning task type, correlating with subjective fatigue.
  • Movement-related gamma ERS scaling to movement velocity was preserved, despite a constant amplitude reduction.
  • Connectivity within fronto-parieto-occipital areas, associated with attentional networks, decreased after practice and rest.

Conclusions:

  • Movement-related gamma ERS amplitude reduction after practice and rest may reflect fatigue or strategy automatization, not specific plasticity.
  • Findings suggest that reduced attention or working memory mechanisms contribute to observed changes in gamma activity.
  • Gamma ERS remains a reliable indicator of movement velocity, even with practice-induced amplitude modulation.