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A real-time comparison between direct control, sequential pattern recognition control and simultaneous pattern
Sophie M Wurth1, Levi J Hargrove
1Institute of Bioengineering, Swiss Federal Institute of Technology (EPFL), Lausanne CH-1015, Switzerland. sophie.wurth@epfl.ch.
Journal of Neuroengineering and Rehabilitation
|June 3, 2014
Summary
New real-time tests show pattern recognition (PR) control strategies significantly improve myoelectric prosthesis function. Simultaneous PR control offers superior performance over direct control for upper limb prostheses.
Area of Science:
- Biomedical Engineering
- Human-Computer Interaction
- Rehabilitation Robotics
Background:
- Offline classification accuracy is insufficient for evaluating real-time myoelectric prosthesis control.
- Existing functional tests lack objectivity and real-time challenge.
Purpose of the Study:
- To develop and validate a real-time assessment methodology for myoelectric upper limb prosthesis control strategies.
- To compare the functional performance of direct control, sequential pattern recognition (PR), and simultaneous PR control.
Main Methods:
- A 2D target acquisition task based on Fitts' law was designed.
- Nine able-bodied and two amputee subjects participated.
- Three control strategies (direct, sequential PR, simultaneous PR) were evaluated using metrics like throughput and path efficiency.
Main Results:
- The methodology achieved high Fitts' law coefficients of determination.
- Both PR strategies outperformed direct control in two-DOF tasks.
- Simultaneous PR showed significant improvements in throughput and path efficiency compared to direct and sequential PR.
Conclusions:
- A novel, objective real-time test effectively differentiates prosthetic control strategies.
- Simultaneous PR control demonstrates statistically significant functional advantages for myoelectric prostheses.
- The test is adaptable for amputee users, though further research is needed.
