Physical factors influencing pleasant touch during tactile exploration.

<h4>Background</h4>When scanning surfaces, humans perceive some of their physical attributes. These percepts are frequently accompanied by a sensation of (un)pleasantness. We therefore hypothesized that aspects of the mechanical activity induced by scanning surfaces with fingertips could...

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Autores principales:	Anne Klöcker, Michael Wiertlewski, Vincent Théate, Vincent Hayward, Jean-Louis Thonnard
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/383d873860164a00863ed8904c9a8ed5
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id	oai:doaj.org-article:383d873860164a00863ed8904c9a8ed5
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spelling	oai:doaj.org-article:383d873860164a00863ed8904c9a8ed52021-11-18T08:46:36ZPhysical factors influencing pleasant touch during tactile exploration.1932-620310.1371/journal.pone.0079085https://doaj.org/article/383d873860164a00863ed8904c9a8ed52013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24244425/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>When scanning surfaces, humans perceive some of their physical attributes. These percepts are frequently accompanied by a sensation of (un)pleasantness. We therefore hypothesized that aspects of the mechanical activity induced by scanning surfaces with fingertips could be objectively associated with a pleasantness sensation. Previously, we developed a unidimensional measure of pleasantness, the Pleasant Touch Scale, quantifying the pleasantness level of 37 different materials. Findings of this study suggested that the sensation of pleasantness was influenced by the average magnitude of the frictional forces brought about by sliding the finger on the surface, and by the surface topography. In the present study, we correlated (i) characteristics of the fluctuations of frictional forces resulting from the interaction between the finger and the surface asperities as well as (ii) the average friction with the sensation of pleasantness.<h4>Results</h4>Eight blindfolded participants tactually explored twelve materials of the Pleasant Touch Scale through lateral sliding movements of their index fingertip. During exploration, the normal and tangential interaction force components, fN and fT , as well as the fingertip trajectory were measured. The effect of the frictional force on pleasantness sensation was investigated through the analysis of the ratio fT to fN , i.e. the net coefficient of kinetic friction, μ. The influence of the surface topographies was investigated through analysis of rapid fT fluctuations in the spatial frequency domain. Results showed that high values of μ were anticorrelated with pleasantness. Furthermore, surfaces associated with fluctuations of fT having higher amplitudes in the low frequency range than in the high one were judged to be less pleasant than the surfaces yielding evenly distributed amplitudes throughout the whole spatial frequency domain.<h4>Conclusion</h4>Characteristics of the frictional force fluctuations and of the net friction taking place during scanning can reliably be correlated with the pleasantness sensation of surfaces.Anne KlöckerMichael WiertlewskiVincent ThéateVincent HaywardJean-Louis ThonnardPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 11, p e79085 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Anne Klöcker Michael Wiertlewski Vincent Théate Vincent Hayward Jean-Louis Thonnard Physical factors influencing pleasant touch during tactile exploration.
description	<h4>Background</h4>When scanning surfaces, humans perceive some of their physical attributes. These percepts are frequently accompanied by a sensation of (un)pleasantness. We therefore hypothesized that aspects of the mechanical activity induced by scanning surfaces with fingertips could be objectively associated with a pleasantness sensation. Previously, we developed a unidimensional measure of pleasantness, the Pleasant Touch Scale, quantifying the pleasantness level of 37 different materials. Findings of this study suggested that the sensation of pleasantness was influenced by the average magnitude of the frictional forces brought about by sliding the finger on the surface, and by the surface topography. In the present study, we correlated (i) characteristics of the fluctuations of frictional forces resulting from the interaction between the finger and the surface asperities as well as (ii) the average friction with the sensation of pleasantness.<h4>Results</h4>Eight blindfolded participants tactually explored twelve materials of the Pleasant Touch Scale through lateral sliding movements of their index fingertip. During exploration, the normal and tangential interaction force components, fN and fT , as well as the fingertip trajectory were measured. The effect of the frictional force on pleasantness sensation was investigated through the analysis of the ratio fT to fN , i.e. the net coefficient of kinetic friction, μ. The influence of the surface topographies was investigated through analysis of rapid fT fluctuations in the spatial frequency domain. Results showed that high values of μ were anticorrelated with pleasantness. Furthermore, surfaces associated with fluctuations of fT having higher amplitudes in the low frequency range than in the high one were judged to be less pleasant than the surfaces yielding evenly distributed amplitudes throughout the whole spatial frequency domain.<h4>Conclusion</h4>Characteristics of the frictional force fluctuations and of the net friction taking place during scanning can reliably be correlated with the pleasantness sensation of surfaces.
format	article
author	Anne Klöcker Michael Wiertlewski Vincent Théate Vincent Hayward Jean-Louis Thonnard
author_facet	Anne Klöcker Michael Wiertlewski Vincent Théate Vincent Hayward Jean-Louis Thonnard
author_sort	Anne Klöcker
title	Physical factors influencing pleasant touch during tactile exploration.
title_short	Physical factors influencing pleasant touch during tactile exploration.
title_full	Physical factors influencing pleasant touch during tactile exploration.
title_fullStr	Physical factors influencing pleasant touch during tactile exploration.
title_full_unstemmed	Physical factors influencing pleasant touch during tactile exploration.
title_sort	physical factors influencing pleasant touch during tactile exploration.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/383d873860164a00863ed8904c9a8ed5
work_keys_str_mv	AT anneklocker physicalfactorsinfluencingpleasanttouchduringtactileexploration AT michaelwiertlewski physicalfactorsinfluencingpleasanttouchduringtactileexploration AT vincenttheate physicalfactorsinfluencingpleasanttouchduringtactileexploration AT vincenthayward physicalfactorsinfluencingpleasanttouchduringtactileexploration AT jeanlouisthonnard physicalfactorsinfluencingpleasanttouchduringtactileexploration
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Physical factors influencing pleasant touch during tactile exploration.

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