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Related Experiment Videos

A motion control function evaluation system employing a pen tablet.

Junichi Iwamoto1, Yoshiharu Yonezawa, Hiromichi Maki

  • 1Dept. of Electronics, Hiroshima Inst. of Technology, Hiroshima 731-5193, Japan.

Biomedical Sciences Instrumentation
|April 27, 2005
PubMed
Summary

This study introduces a new pen tablet system to assess hand motion control. Patients with cerebral infarction showed increased movement distance, indicating the system

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Area of Science:

  • Neurology
  • Biomedical Engineering
  • Rehabilitation Medicine

Background:

  • Brain diseases like cerebral infarction significantly impair motor control.
  • Accurate and objective assessment of hand motion is crucial for diagnosis and rehabilitation.
  • Existing methods for evaluating hand function may lack quantitative precision.

Purpose of the Study:

  • To develop and validate a novel pen tablet-based system for quantitative evaluation of hand motion control.
  • To assess the system's ability to differentiate hand motion control deficits in individuals with and without cerebral infarction.
  • To establish a reliable tool for monitoring functional recovery after neurological injury.

Main Methods:

  • A pen tablet system connected to a laptop was used to record pen tap positions and timing.

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  • Participants (10 healthy, 3 cerebral infarction) performed 50 taps with each hand, eyes closed.
  • Key metrics calculated included absolute distance between taps, total distance moved, tapping period, and total tapping time.

    • Main Results:

    • Subjects with cerebral infarction exhibited significantly greater average total tap point distance and absolute distance moved compared to healthy controls.
    • Tapping period and total tapping time showed normal variations across both groups, suggesting preserved rhythm but impaired spatial accuracy.
    • The system successfully quantified differences in hand motion control related to cerebral infarction.

    Conclusions:

    • The developed pen tablet system provides a quantitative and objective measure of hand motion control.
    • Increased movement distance is a sensitive indicator of impaired hand function in cerebral infarction.
    • This technology holds potential for clinical assessment and tracking of neurological motor deficits.