Effect of vibration characteristics and vibror arrangement on the tactile perception of the upper arm in healthy subjects and upper limb amputees.
Matthieu Guemann, Sandra Bouvier, Christophe Halgand and 6 others
PMID 31722740WHAT IT FOUND
A circular proportional band of six vibration motors on the upper arm gave better location discrimination than linear bands in 11 healthy people.
Longer, stronger pulses made motors easier to feel and locate. Patients also located motors, but this was lab testing, not prosthesis use.
Key findings
01The circular proportional arrangement gave the best spatial recognition in healthy subjects, with a mean 53% success rate, compared with 42% for circular absolute, 40% for linear proportional and 34% for linear absolute.
02In healthy subjects, 140 ms stimulations were 2.39 times more likely to be answered correctly than 60 ms stimulations, and high intensity was 5.41 times more likely to be answered correctly than low intensity.
03For patients, mean correct localization was 67.72% in session 1 and 83.33% in session 2, and the difference between sessions was significant.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
The study used only 11 healthy participants and 7 amputees, so it cannot show how most patients would perform. The amputee group was only men and had traumatic humeral amputations, so it does not cover women, other amputation causes or other amputation levels. The task was locating taped vibration motors on the skin, not controlling a myoelectric prosthesis in a daily activity. Stimulation intensity was fixed rather than calibrated for each person, and the shortest, weakest pulses were often barely perceived. Familiarization was short and no feedback was given, so the scores reflect first exposure rather than trained performance. For amputees, linear arrangements could not be tested on many stumps because the residual limb was too short. The patient session difference may reflect learning during the two tests, not a stable clinical effect.
Declared interests
No conflicts of interest or funding declaration is included in the supplied text.
The easy way to misread this
Do not conclude that circular vibrotactile feedback improves real prosthesis control. The study tested location discrimination with motors taped to the skin, and the patient results came from a small group in two short sessions, not from functional prosthetic use.