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MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
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Finger tremor can be voluntarily reduced during a tracking task.

Jean-François Daneault1, Benoit Carignan, Christian Duval

  • 1Département de Kinanthropologie, Université du Québec à Montréal, 141 Avenue du Président-Kennedy, Montréal, Québec, Canada.

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Summary

Physiological tremor impacts precise movements. While its amplitude can be voluntarily reduced during tasks, this does not improve accuracy and may even decrease performance.

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Area of Science:

  • Neuroscience
  • Human Motor Control
  • Biomechanics

Background:

  • Physiological tremor negatively affects fine motor skills.
  • Previous research demonstrated voluntary reduction of postural tremor amplitude.
  • The impact of voluntary tremor modulation on movement accuracy remained unexplored.

Purpose of the Study:

  • Characterize tremor dynamics during voluntary movements.
  • Investigate the feasibility of reducing tremor amplitude during action.
  • Quantify the effects of tremor modulation on movement accuracy.

Main Methods:

  • Measured finger tremor in 12 healthy volunteers using laser displacement sensing.
  • Recorded tremor during static postural conditions and a target tracking task.
  • Assessed tremor during tracking while participants attempted amplitude reduction.

Main Results:

  • Tremor power spectrum characteristics were consistent between static and movement conditions.
  • Voluntary reduction of tremor amplitude was achieved.
  • Reduced tremor amplitude correlated with increased tracking error, especially at higher target velocities.

Conclusions:

  • Tremor persists during voluntary movements and can be modulated.
  • Voluntarily reducing tremor amplitude during movement does not enhance tracking performance.
  • Attempting to suppress tremor during action may impair accuracy.