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Normalized compression distance to measure cortico-muscular synchronization.

Annalisa Pascarella1, Eugenia Gianni2,3, Matteo Abbondanza4

  • 1Institute for the Applications of Calculus "M. Picone", National Research Council, Rome, Italy.

Frontiers in Neuroscience
|November 28, 2022
PubMed
Summary
This summary is machine-generated.

Normalized Compression Distance (NCD) quantifies neuronal synchronization. This measure reveals differences in brain-body control between dominant and non-dominant hands, especially during novel tasks.

Keywords:
electrophysiologyfeedbackhandednessneuronal synchronizationnormalized compression distance (NCD)

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Biophysics

Background:

  • Neuronal functional connectivity is dynamic and crucial for brain states and task execution.
  • Quantifying synchronization between brain regions is essential for understanding neural networks.
  • Cortico-muscular synchronization is a key mechanism for motor control.

Purpose of the Study:

  • To evaluate the Normalized Compression Distance (NCD) as a measure of neuronal synchronization.
  • To test NCD's sensitivity to physiological properties, specifically cortico-muscular synchronization.
  • To investigate hemispheric asymmetry and novelty effects in motor control using NCD.

Main Methods:

  • Utilized Normalized Compression Distance (NCD) to quantify synchronization between neuronal electrical activity in two brain regions.
  • Applied NCD to measure cortico-muscular synchronization in 15 healthy volunteers during a weak handgrip task.
  • Analyzed NCD's sensitivity to dominant-non-dominant hand asymmetry and novelty using Huffman and Lempel Ziv compressors.

Main Results:

  • NCD demonstrated sensitivity to dominant-non-dominant hand asymmetry during novelty management (p = 0.011; p = 0.007).
  • NCD revealed dependence on novelty levels when moving the non-dominant hand (p = 0.012; p = 0.024).
  • Lower synchronization levels were observed for less dexterous networks, indicating NCD's ability to reflect motor control efficiency.

Conclusions:

  • Normalized Compression Distance (NCD) is a sensitive measure for assessing neuronal synchronization and functional connectivity.
  • NCD can differentiate between dominant and non-dominant hand control, particularly under novel conditions.
  • NCD offers a valuable tool for enriching the estimation of functional two-node connectivity in the motor control network.