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Related Experiment Videos

Physiological tremor in human jaw-muscle system

D Junge1, J R Rosenberg, D M Halliday

  • 1School of Dentistry, University of California, Los Angeles 90095, USA.

Archives of Oral Biology
|May 7, 1998
PubMed
Summary

Jaw tremor primarily stems from neural activity, not mechanical factors. This study found a strong link between jaw muscle electrical signals and tremor, suggesting a neurogenic origin for this rhythmic jaw movement.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Physiology

Background:

  • Tremor in peripheral limbs has both mechanical and neurogenic origins.
  • Jaw tremor is a common phenomenon occurring at rest and during movement.

Purpose of the Study:

  • To investigate the underlying components of jaw tremor.
  • To determine if mechanical resonance or neurogenic factors contribute to jaw tremor.

Main Methods:

  • Jaw tremor was measured using a position transducer.
  • Mechanical resonance was assessed by adding weights to the mandible and applying sharp taps.
  • Electromyographic (EMG) signals from masseter muscles were recorded.
  • Correlation and frequency-domain analyses were performed between EMG and tremor signals.

Main Results:

  • Mechanical resonance was ruled out as jaw tremor frequency was unaffected by added weights and no damped oscillations were observed after taps.
  • No correlation was found between jaw tremor and electrocardiogram (ECG) signals.
  • A significant correlation was identified between rectified masseter EMG signals and jaw tremor, with EMG preceding movement by 20-30 ms.
  • Frequency-domain analysis revealed coherence between EMG and tremor signals.

Conclusions:

  • Jaw tremor is predominantly driven by a neurogenic component.
  • The findings suggest that central neural oscillators or neural loops are responsible for jaw tremor generation.

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