Fast grip force adaptation to friction relies on localized fingerpad strains

Author:

Delhaye Benoit P.12ORCID,Schiltz Félicien12,Crevecoeur Frédéric12ORCID,Thonnard Jean-Louis12,Lefèvre Philippe12ORCID

Affiliation:

1. Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium.

2. Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Université catholique de Louvain, Louvain-la-Neuve, Belgium.

Abstract

During object manipulation, humans adjust the grip force to friction, such that slippery objects are squeezed more firmly than sticky ones. This essential mechanism to keep a stable grasp relies on feedback from tactile afferents innervating the fingertips, that are sensitive to local skin strains. To test if this feedback originates from the skin-object interface, we asked participants to perform a grip-lift task with an instrumented object able to monitor skin strains at the contact through transparent plates of different frictions. We observed that, following an unbeknown change in plate across trials, participants adapted their grip force to friction. After switching from high to low friction, we found a significant increase in strain inside the contact arising ~100 ms before the modulation of grip force, suggesting that differences in strain patterns before lift-off are used by the nervous system to quickly adjust the force to the frictional properties of manipulated objects.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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