The Interaction Between Feedback Type and Learning in Routine Grasping With Myoelectric Prostheses.

Area of Science:

• Biomedical Engineering
• Neuroscience
• Rehabilitation Science

Background:

• Upper-limb loss necessitates prosthetic fitting, which often lacks tactile sensation vital for grasp control.
• Restoring force feedback to prosthetics is hypothesized to improve grasping control, but research findings are conflicting.

Purpose of the Study:

• To investigate the impact of different feedback types on learning and performance in prosthetic grasping tasks.
• To determine if enhanced force feedback (visual or vibratory) improves control compared to basic auditory feedback.

Main Methods:

• Participants grasped objects with a prosthesis, aiming for unknown low or high target-force ranges (TFR).
• Three feedback conditions were tested: basic auditory, auditory with visual force feedback, and auditory with vibratory force feedback.
• Performance was evaluated based on learning curves and steady-state grasping force control.

Main Results:

• Performance was stable for low TFR but significantly worse for high TFR, showing a notable training effect.
• Learning and steady-state performance were not significantly influenced by the type of feedback provided.
• Basic auditory feedback on task outcome proved sufficient for routine grasping tasks.

Conclusions:

• For routine grasping with myoelectric prostheses using surface EMG, basic auditory feedback is adequate.
• Enhanced force-related feedback (visual or vibratory) does not offer significant advantages over basic feedback for this specific task.
• The findings suggest that motor adaptation and basic outcome feedback are sufficient for accomplishing routine prosthetic grasping tasks.