Myoelectric Control System and Task-Specific Characteristics Affect Voluntary Use of Simultaneous Control

Clinically available myoelectric control does not enable simultaneous proportional control of prosthetic degrees of freedom. Multiple studies have proposed systems that provide simultaneous control, though few have investigated whether subjects voluntarily use simultaneous control or how they implem...

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Bibliographic Details
Published in:IEEE transactions on neural systems and rehabilitation engineering 2016-01, Vol.24 (1), p.109-116
Main Authors: Smith, Lauren H., Kuiken, Todd A., Hargrove, Levi J.
Format: Article
Language:English
Subjects:
Algorithms
Auditoriums
Complexity theory
Control systems
Electromyography
Electromyography - methods
Feedback, Physiological - physiology
Female
Fitts' Law
Humans
intramuscular electromyography
Male
Mathematical analysis
Movement - physiology
Movements
Muscle Contraction - physiology
Muscle, Skeletal - physiology
Muscles
Myoelectric control
Myoelectricity
Postural Balance - physiology
Proportional control
Prostheses
prosthesis control
Rehabilitation
Renovation & restoration
School environment
School safety
Sequential control
Stability
Strategy
Task Performance and Analysis
Tasks
User-Computer Interface
Velocity
Velocity control
Volition - physiology
Wrist
Young Adult
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Summary:Clinically available myoelectric control does not enable simultaneous proportional control of prosthetic degrees of freedom. Multiple studies have proposed systems that provide simultaneous control, though few have investigated whether subjects voluntarily use simultaneous control or how they implement it. Additionally, few studies have explicitly evaluated the effect of providing proportional velocity control. The objective of this study was to evaluate factors influencing when and how subjects use simultaneous myoelectric control, including the ability to proportionally control the velocity and the required task precision. Five able-bodied subjects used simultaneous myoelectric control systems with and without proportional velocity control in a virtual Fitts' Law task. Though subjects used simultaneous control to a substantial degree when proportional velocity control was present, they used very little simultaneous control when using constant-velocity control. Furthermore, use of simultaneous control varied significantly with target distance and width, reflecting a strategy of using simultaneous control for gross cursor positioning and sequential control for fine corrective movements. These results provide insight into how users take advantage of simultaneous control and highlight the need for real-time evaluation of simultaneous control algorithms, as the potential benefit of providing simultaneous control may be affected by other characteristics of the myoelectric control system.
ISSN:1534-4320
1558-0210
DOI:10.1109/TNSRE.2015.2410755