The effect of tactile augmentation on manipulation and grip force control during force-field adaptation.
Chen Avraham, Ilana Nisky
PMID 32046743WHAT IT FOUND
Artificial skin stretch changed force control, not movement paths.
Stretch opposite the force-field improved manipulation force adaptation; stretch in the same direction increased grip force modulation and slowed manipulation adaptation. This was a healthy adult lab study, not clinical rehabilitation evidence.
Key findings
01Skin-stretch direction did not change movement-path adaptation.
02At the end of adaptation, the opposite-stretch group showed higher manipulation-force adaptation than the same-direction group.
03The same-direction stretch group applied more grip force per load force at end of adaptation than opposite and control groups.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was done in 45 healthy volunteers, not in people with stroke, hand injury, spinal cord injury, or other conditions a therapist treats. Participants had to hold the device in a precision grip, which the authors say is not appropriate for many rehabilitation cases because fine manipulation is often impaired. The device could not measure the natural skin stretch from the handle or the actual amount of artificial stretch, so the dose of tactile stimulation is unclear. There was large variability between participants in how they responded to skin stretch. The outcomes are laboratory force-control measures, not function, safety, pain, or daily activities. The paper does not state which outcome was primary, so the findings are a set of related manipulation and grip force results. The rehabilitation implications are discussed by the authors but were not tested in patients.
Declared interests
Funding came from the United States-Israel Binational Science Foundation, the Ministry of Science and Technology Israel, and the Helmsley Charitable Trust through the Agricultural, Biological and Cognitive Robotics Initiative and the Marcus Endowment Fund at Ben-Gurion University of the Negev. The text does not report other conflicts of interest.
The easy way to misread this
Do not conclude that skin-stretch devices should be used in therapy. The study tested healthy people in a lab force-field task, not patients, and the authors state that studies on target populations are needed before conclusions about rehabilitation efficacy.