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Physiological tremor: does handedness make a difference?

A Beuter1, R Edwards, A Boucher

  • 1Cognitive Neuroscience Centre, University of Quebec at Montreal, Canada. beuter.anne@uqam.ca

The International Journal of Neuroscience
|April 15, 2000
PubMed
Summary
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This study precisely quantified physiological tremor in right-handed females, finding significant differences in tremor characteristics between the dominant and nondominant hands and across different task conditions.

Area of Science:

  • Neuroscience
  • Human Physiology
  • Biomedical Engineering

Background:

  • Physiological tremor is a normal, involuntary rhythmic movement.
  • Understanding tremor characteristics is crucial for diagnosing neurological disorders.
  • Hand dominance may influence tremor parameters.

Purpose of the Study:

  • To precisely quantify physiological tremor characteristics in the dominant and nondominant hands of right-handed females.
  • To investigate the influence of different neuromotor conditions (relax, static, dynamic) on tremor parameters.
  • To identify differences in tremor characteristics between hands and conditions.

Main Methods:

  • Twenty-two right-handed females (aged 20-40) participated.
  • Tremor was recorded from index fingers using helium neon velocity lasers under eyes-closed conditions.

Related Experiment Videos

  • Subjects underwent three conditions: relax, static pressure, and dynamic pressure.
  • Seven tremor signal parameters were analyzed: harmonicity, median frequency, power in 7-12 Hz, amplitude, waveform morphology, entropy, and nonlinearity.

    • Main Results:

    • Significant differences in median frequency, power in 7-12 Hz, and entropy were found between hands.
    • Tremor amplitude (RMS) did not differ significantly between hands.
    • Five out of seven tremor characteristics showed significant differences between the tested conditions.

    Conclusions:

    • Neuromotor activity significantly influences physiological tremor characteristics.
    • Specific tremor characteristics differ significantly between the right and left hands in right-handed females.
    • These findings contribute to a precise understanding of normal hand tremor variations.