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Operator error in a level coded myoelectric control channel

E Morin1, P A Parker, R N Scott

  • 1Department of Electrical Engineering, Queen's University, Kingston, ON, Canada.

IEEE Transactions on Bio-Medical Engineering
|June 1, 1993
PubMed
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Operator error in myoelectric prostheses is significant and often exceeds system error. Optimizing control systems requires considering user error alongside technical system error for better prosthetic function.

Area of Science:

  • Biomedical Engineering
  • Rehabilitation Engineering
  • Human-Computer Interaction

Background:

  • Myoelectric prostheses utilize level-coded control for user interaction.
  • Current control systems are optimized primarily for system error, not operator error.
  • Operator error is a critical factor in the performance of myoelectric control.

Purpose of the Study:

  • To investigate and quantify operator error in level-coded myoelectric control.
  • To compare operator error with system error in myoelectric prosthesis control.
  • To inform the optimization of control parameters for myoelectric prostheses.

Main Methods:

  • Minimized system error to isolate and study operator error.
  • Quantified operator error by analyzing user responses.

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  • Assessed the magnitude of operator error relative to system error.

    • Main Results:

    • Operator error magnitude surpassed experimental system error.
    • Operator error exceeded typical system error in prosthesis control units.
    • Operator response distribution was found to be normal, characterized by mean and standard deviation.

    Conclusions:

    • Operator error is a substantial factor in myoelectric control and must be addressed.
    • Optimizing target and switching levels requires considering operator error.
    • Understanding operator response distribution aids in determining optimal control settings.