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Perception of partial slips under tangential loading of the fingertip

During tactile exploration, partial slips occur systematically at the periphery of fingertip-object contact prior to full slip. Although the mechanics of partial slips are well characterized, the perception of such events is unclear. Here, we performed psychophysical experiments to assess partial sl...

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Autores principales: Barrea, Allan, Delhaye, Benoit P., Lefèvre, Philippe, Thonnard, Jean-Louis
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5935679/
https://www.ncbi.nlm.nih.gov/pubmed/29728576
http://dx.doi.org/10.1038/s41598-018-25226-w
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author Barrea, Allan
Delhaye, Benoit P.
Lefèvre, Philippe
Thonnard, Jean-Louis
author_facet Barrea, Allan
Delhaye, Benoit P.
Lefèvre, Philippe
Thonnard, Jean-Louis
author_sort Barrea, Allan
collection PubMed
description During tactile exploration, partial slips occur systematically at the periphery of fingertip-object contact prior to full slip. Although the mechanics of partial slips are well characterized, the perception of such events is unclear. Here, we performed psychophysical experiments to assess partial slip detection ability on smooth transparent surfaces. In these experiments, the index fingertip of human subjects was stroked passively by a smooth, transparent glass plate while we imaged the contact slipping against the glass. We found that subjects were able to detect fingertip slip before full slip occurred when, on average, only 48% of the contact area was slipping. Additionally, we showed that partial slips and plate displacement permitted slip detection, but that the subjects could not rely on tangential force to detect slipping of the plate. Finally, we observed that, keeping the normal contact force constant, slip detection was impeded when the plate was covered with a hydrophobic coating dramatically lowering the contact friction and therefore the amount of fingertip deformation. Together, these results demonstrate that partial slips play an important role in fingertip slip detection and support the hypothesis that the central nervous system relies on them to adjust grip force during object manipulation.
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spelling pubmed-59356792018-05-10 Perception of partial slips under tangential loading of the fingertip Barrea, Allan Delhaye, Benoit P. Lefèvre, Philippe Thonnard, Jean-Louis Sci Rep Article During tactile exploration, partial slips occur systematically at the periphery of fingertip-object contact prior to full slip. Although the mechanics of partial slips are well characterized, the perception of such events is unclear. Here, we performed psychophysical experiments to assess partial slip detection ability on smooth transparent surfaces. In these experiments, the index fingertip of human subjects was stroked passively by a smooth, transparent glass plate while we imaged the contact slipping against the glass. We found that subjects were able to detect fingertip slip before full slip occurred when, on average, only 48% of the contact area was slipping. Additionally, we showed that partial slips and plate displacement permitted slip detection, but that the subjects could not rely on tangential force to detect slipping of the plate. Finally, we observed that, keeping the normal contact force constant, slip detection was impeded when the plate was covered with a hydrophobic coating dramatically lowering the contact friction and therefore the amount of fingertip deformation. Together, these results demonstrate that partial slips play an important role in fingertip slip detection and support the hypothesis that the central nervous system relies on them to adjust grip force during object manipulation. Nature Publishing Group UK 2018-05-04 /pmc/articles/PMC5935679/ /pubmed/29728576 http://dx.doi.org/10.1038/s41598-018-25226-w Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Barrea, Allan
Delhaye, Benoit P.
Lefèvre, Philippe
Thonnard, Jean-Louis
Perception of partial slips under tangential loading of the fingertip
title Perception of partial slips under tangential loading of the fingertip
title_full Perception of partial slips under tangential loading of the fingertip
title_fullStr Perception of partial slips under tangential loading of the fingertip
title_full_unstemmed Perception of partial slips under tangential loading of the fingertip
title_short Perception of partial slips under tangential loading of the fingertip
title_sort perception of partial slips under tangential loading of the fingertip
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5935679/
https://www.ncbi.nlm.nih.gov/pubmed/29728576
http://dx.doi.org/10.1038/s41598-018-25226-w
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