A compact solution for vibrotactile proprioceptive feedback of wrist rotation and hand aperture.
Andrea Marinelli, Nicolò Boccardo, Michele Canepa and 7 others
PMID 39135110WHAT IT FOUND
A compact vibrotactile feedback system conveying wrist rotation and hand aperture using a single array of motors performed as well as a conventional two-array system.
Neither scheme matched visual feedback accuracy, but both significantly outperformed having no feedback.
Key findings
01There was no statistically significant difference in performance between the compact single-array feedback and the conventional two-array feedback for either accuracy or efficiency.
02Vibrotactile feedback resulted in significantly better endpoint error performance compared to the no-feedback condition.
03Visual feedback provided the highest accuracy, significantly outperforming both vibrotactile and auditory feedback conditions.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was conducted in a laboratory setting with a single session of training, so it does not reflect long-term functional use or learning effects. Test and control conditions were performed by separate groups of participants to avoid fatigue, which introduces potential group differences. The sample size was small (four amputees), limiting generalizability to the broader prosthetic user population. The prosthesis was hidden and motor noise blocked, removing incidental cues that users typically rely on in real-world scenarios.
Declared interests
Funded by Istituto Nazionale Assicurazione Infortuni sul Lavoro (INAIL).
The easy way to misread this
Do not interpret the similar performance of the compact and conventional feedback systems as evidence that vibrotactile feedback is superior to visual or auditory feedback. Visual feedback was significantly more accurate, and auditory feedback was comparable to vibrotactile feedback, suggesting that non-invasive sensory substitution may not offer a clear advantage over existing incidental cues.