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Related Concept Videos

Open and closed-loop control systems01:17

Open and closed-loop control systems

Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...

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Estimating speed-accuracy trade-offs to evaluate and understand closed-loop prosthesis interfaces.

Pranav Mamidanna1, Jakob L Dideriksen1, Strahinja Dosen1

  • 1Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.

Journal of Neural Engineering
|August 17, 2022
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Summary
This summary is machine-generated.

Electromyography (EMG) feedback enhances closed-loop prosthesis control performance compared to force feedback, especially at medium speeds. Evaluating interfaces using speed-accuracy trade-off functions reveals critical differences in user control and prosthesis capabilities.

Keywords:
EMG biofeedbackclosed-loop interfacesforce feedbackmotor skillmyoelectric prosthesis controlspeed–accuracy trade-off

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Robotics
  • Human-Machine Interfaces

Background:

  • Closed-loop prosthesis interfaces integrating electromyography (EMG) control with feedback are key for advanced bionic limbs.
  • Understanding user interaction and evaluating competing interfaces remain challenges in prosthesis development.

Purpose of the Study:

  • To evaluate and compare two closed-loop user-prosthesis interfaces using the speed-accuracy trade-off (SAF) framework.
  • To investigate how feedback type (EMG vs. Force) and execution speed affect user performance and control strategies.

Main Methods:

  • Ten able-bodied participants and one amputee performed a force-matching task in a crossover design.
  • Two direct proportional control interfaces with different feedback (EMG vs. Force) were tested at three speeds.
  • Speed-accuracy trade-off functions were estimated to analyze performance and control policies.

Main Results:

  • Execution speed significantly impacted performance; EMG feedback yielded better overall results, particularly at medium speeds.
  • EMG feedback demonstrated superior speed-accuracy trade-off functions, allowing faster achievement of higher accuracies than Force feedback.
  • Both interfaces supported flexible control policies, but EMG feedback also facilitated smoother, more repeatable EMG command generation.

Conclusions:

  • Closed-loop prosthesis interface performance is critically dependent on feedback type and execution speed.
  • The SAF framework effectively highlights performance differences between interfaces that single-speed assessments might miss.
  • Rigorous evaluation of user-prosthesis interfaces necessitates consideration of speed-accuracy trade-offs.