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Fast Grip Force Adaptation To Friction Relies On Localized Fingerpad Strains

View ORCID ProfileFélicien Schiltz, View ORCID ProfileBenoit P. Delhaye, View ORCID ProfileFrédéric Crevecoeur, View ORCID ProfileJean-Louis Thonnard, View ORCID ProfilePhilippe Lefèvre
doi: https://doi.org/10.1101/2021.07.20.452911
Félicien Schiltz
1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
2Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Université catholique de Louvain, Louvain-la-Neuve, Belgium
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Benoit P. Delhaye
1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
2Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Université catholique de Louvain, Louvain-la-Neuve, Belgium
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Frédéric Crevecoeur
1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
2Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Université catholique de Louvain, Louvain-la-Neuve, Belgium
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Jean-Louis Thonnard
1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
2Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Université catholique de Louvain, Louvain-la-Neuve, Belgium
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Philippe Lefèvre
1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium
2Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Université catholique de Louvain, Louvain-la-Neuve, Belgium
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  • For correspondence: philippe.lefevre@uclouvain.be
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Abstract

Humans can quickly adjust their grip force to a change in friction at the object-skin interface during dexterous manipulation in a precision grip. To perform this adjustment, they rely on the feedback of the mechanoreceptive afferents innervating the fingertip skin. Because these tactile afferents encode information related to skin deformation, the nature of the feedback signaling a change in friction must somehow originate from a difference in the way the skin deforms when manipulating objects of different frictions. To better characterize the origin of the underlying sensory events, we asked human participants to perform a grip-lifting task with a manipulandum equipped with an optical imaging system. This system enabled to monitor fingertip skin strains through transparent plates of glass that had different levels of friction. We observed that, following an unexpected change in friction, participants adapted their grip force within 370ms after contact with the surface. By comparing the deformation patterns when unexpectedly switching from a high to a low friction condition, we found a significant increase in skin deformation inside the contact area arising over 100ms before the motor response, during the loading phase, suggesting that local and partial deformation patterns prior to lift-off are used in the nervous system to adjust the grip force as a function of the frictional condition.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • ↵* co-first authors.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted July 20, 2021.
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Fast Grip Force Adaptation To Friction Relies On Localized Fingerpad Strains
Félicien Schiltz, Benoit P. Delhaye, Frédéric Crevecoeur, Jean-Louis Thonnard, Philippe Lefèvre
bioRxiv 2021.07.20.452911; doi: https://doi.org/10.1101/2021.07.20.452911
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Fast Grip Force Adaptation To Friction Relies On Localized Fingerpad Strains
Félicien Schiltz, Benoit P. Delhaye, Frédéric Crevecoeur, Jean-Louis Thonnard, Philippe Lefèvre
bioRxiv 2021.07.20.452911; doi: https://doi.org/10.1101/2021.07.20.452911

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