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Dynamics of fingertip contact during the onset of tangential slip

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Delhaye, Benoit [UCL] Lefèvre, Philippe [UCL] Thonnard, Jean-Louis [UCL]

Through highly precise perceptual and sensorimotor activities, the human tactile system continuously acquires information about the environment. Mechanical interactions between the skin at the point of contact and a touched surface serve as the source of this tactile information. Using a dedicated custom robotic platform, we imaged skin deformation at the contact area between the finger and a flat surface during the onset of tangential sliding movements in four different directions (proximal, distal, radial and ulnar) and with varying normal force and tangential speeds. This simple tactile event evidenced complex mechanics. We observed a reduction of the contact area while increasing the tangential force and proposed to explain this phenomenon by nonlinear stiffening of the skin. The deformation's shape and amplitude were highly dependent on stimulation direction. We conclude that the complex, but highly patterned and reproducible, deformations measured in this study are a potential source of information for the central nervous system and that further mechanical measurement are needed to better understand tactile perceptual and motor performances.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2014
Language Anglais
Journal information "Journal of the Royal Society Interface" - Vol. 11, no. 100, p. 20140698 [1-11] (2014)
Peer reviewed yes
Publisher Royal Society Publishing ((United Kingdom) London)
issn 1742-5689
e-issn 1742-5662
Publication status Publié
Affiliations UCL - SSS/IONS/COSY - Systems & cognitive Neuroscience
UCL - SST/ICTM/INMA - Pôle en ingénierie mathématique
Louvain Bionics - Center of Interdisciplinary Expertise
UCL - (SLuc) Service de médecine physique et de réadaptation motrice
Keywords skin mechanics ; tactile perception ; touch ; friction
Links
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Bibliographic reference Delhaye, Benoit ; Lefèvre, Philippe ; Thonnard, Jean-Louis. Dynamics of fingertip contact during the onset of tangential slip. In: Journal of the Royal Society Interface, Vol. 11, no. 100, p. 20140698 [1-11] (2014)
Permanent URL http://hdl.handle.net/2078.1/150629