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Related Experiment Videos

Finger tremor and the central nervous system.

G P Pizzuti1, G H Byford, S Cifaldi

  • 1Chair of the Physiology of Nutrition, Faculty of Food Sciences and Technology, University of Molie, Campobasso, Italy.

Journal of Biomedical Engineering
|July 1, 1992
PubMed
Summary

Physiological tremor and alpha rhythm in the EEG do not share common frequencies, suggesting tremor is not centrally controlled. Hand tremors also lack synchronous relationships, indicating independent control.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Biophysics

Background:

  • Normal physiological tremor and alpha rhythm in electroencephalography (EEG) share a common frequency band around 10 Hz.
  • The potential relationship between finger tremor frequency and EEG alpha rhythm requires investigation to understand physiological tremor.
  • Establishing the underlying physiology of physiological tremor is crucial for clinical and research applications.

Purpose of the Study:

  • To test the hypothesis that finger tremor and EEG alpha rhythm are frequency-related.
  • To investigate the potential central control mechanisms of physiological tremor.
  • To determine if tremor in the left and right hands exhibits a synchronous relationship.

Main Methods:

  • Recorded bilateral occipital EEGs and simultaneous acceleration from the terminal phalanx of the middle finger in eight healthy subjects.

Related Experiment Videos

  • Analyzed recorded data using power spectral densities to quantify signal characteristics.
  • Employed coherence functions to identify common frequency elements between EEG and tremor signals.

    • Main Results:

    • No evidence of frequency-related connections was found between physiological tremor and alpha rhythm in the EEG.
    • Coherence analysis did not reveal common frequency elements shared by the two signal types.
    • Tremor in the right and left hands did not demonstrate a synchronous relationship.

    Conclusions:

    • The findings suggest that physiological tremor is not under central nervous system control.
    • The lack of frequency correlation implies independent physiological mechanisms for tremor and alpha rhythm.
    • Asynchronous tremor between hands indicates localized or peripheral control mechanisms.