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Effects of Confidence-Based Rejection on Usability and Error in Pattern Recognition-Based Myoelectric Control.

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    Movement rejection in myoelectric control improves usability by reducing errors. Optimal performance was achieved with confidence thresholds between 0.60 and 0.75, balancing error mitigation and false rejections.

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    Area of Science:

    • Biomedical Engineering
    • Human-Computer Interaction
    • Rehabilitation Engineering

    Background:

    • Pattern recognition-based myoelectric control enhances prosthetic limb functionality.
    • Movement rejection strategies improve system usability by filtering unreliable classifications.
    • Previous studies determined rejection thresholds heuristically, lacking analysis of their impact on real-time control.

    Purpose of the Study:

    • To investigate the effect of varying rejection thresholds on the trade-off between error reduction and false rejections in myoelectric control.
    • To determine the optimal confidence threshold for movement rejection in real-time closed-loop control.
    • To differentiate and analyze operator versus systemic errors and their correlation with performance metrics.

    Main Methods:

    • A support vector machine classifier was used for real-time classification of myoelectric signals.
    • Twenty-four able-bodied subjects performed a Fitts' law-style virtual cursor control task.
    • Movement rejection was implemented at various confidence thresholds to assess its impact.

    Main Results:

    • Movement rejection improved information throughput across all tested thresholds.
    • The highest performance was observed at rejection thresholds between 0.60 and 0.75.
    • Increasing rejection thresholds reduced both operator and systemic errors.
    • Systemic errors, unlike operator errors, strongly correlated with throughput and trial completion rates.

    Conclusions:

    • Movement rejection significantly enhances the usability of myoelectric control systems.
    • A confidence threshold between 0.60 and 0.75 offers an optimal balance for real-time control.
    • Usability encompasses more than just error prevention, as experienced users still committed errors despite better task performance.