Exploring the impact of myoelectric prosthesis controllers on visuomotor behavior.
Kodi Y Cheng, Heather E Williams, Ahmed W Shehata and 3 others
PMID 40075405WHAT IT FOUND
Seven non-amputees using a simulated myoelectric prosthesis looked less at the hand and moved more smoothly during cross-body tasks when using a position-aware controller.
This was not a clinical trial in amputees, so it does not prove the controller works for patients.
Key findings
01Participants using the position-aware controller had significantly reduced visual fixation on the prosthetic hand during the third movement of the task.
02Eye leaving latency showed a significant main effect favoring the position-aware controller, indicating quicker disengagement of visual attention from objects.
03Movement smoothness improved with the position-aware controller, specifically showing fewer movement units during the reach-grasp phase of the third movement.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study used non-amputees with intact limbs wearing a simulated prosthesis, so muscle activation patterns and limb loading differ from actual transradial amputees. The sample size was very small (n=7), limiting statistical power and generalizability. Participants were novice users with limited training, so results may not reflect experienced prosthesis users. The study did not include sensory feedback, which is a key factor in prosthesis usability and gaze behavior.
Declared interests
Funded by the Natural Sciences and Engineering Research Council of Canada and Killam Trusts. No competing interests declared.
The easy way to misread this
Do not interpret these findings as evidence that the position-aware controller improves clinical outcomes for amputees. The study was conducted on non-amputees using a simulated device, and the small sample size and lack of clinical population mean these results are preliminary and not directly translatable to patient care.