Physical Factors Influencing Pleasant Touch during Tactile Exploration
Identifieur interne : 001965 ( Main/Merge ); précédent : 001964; suivant : 001966Physical Factors Influencing Pleasant Touch during Tactile Exploration
Auteurs : Anne Klöcker [Belgique] ; Michael Wiertlewski [France] ; Vincent Théate [Belgique] ; Vincent Hayward [France] ; Jean-Louis Thonnard [Belgique]Source :
- PLoS ONE [ 1932-6203 ] ; 2013.
Abstract
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
Eight blindfolded participants tactually explored twelve materials of the
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.
Url:
DOI: 10.1371/journal.pone.0079085
PubMed: 24244425
PubMed Central: 3828339
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level="a" type="main">Physical Factors Influencing Pleasant Touch during Tactile Exploration</title><author><name sortKey="Klocker, Anne" sort="Klocker, Anne" uniqKey="Klocker A" first="Anne" last="Klöcker">Anne Klöcker</name><affiliation wicri:level="4"><nlm:aff id="aff1"><addr-line>Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium</addr-line></nlm:aff><country xml:lang="fr">Belgique</country><wicri:regionArea>Institute of Neuroscience, Université catholique de Louvain, Brussels</wicri:regionArea><placeName><settlement type="city">Bruxelles</settlement><region nuts="2">Région de Bruxelles-Capitale</region></placeName><orgName type="university">Université catholique de Louvain</orgName></affiliation></author><author><name sortKey="Wiertlewski, Michael" sort="Wiertlewski, Michael" uniqKey="Wiertlewski M" first="Michael" last="Wiertlewski">Michael Wiertlewski</name><affiliation wicri:level="1"><nlm:aff id="aff2"><addr-line>UPMC Univ Paris, Institut des Systèmes Intelligents et de Robotique, Paris, France</addr-line></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea>UPMC Univ Paris, Institut des Systèmes Intelligents et de Robotique, Paris</wicri:regionArea><placeName><settlement type="city">Paris</settlement></placeName></affiliation></author><author><name sortKey="Theate, Vincent" sort="Theate, Vincent" uniqKey="Theate V" first="Vincent" last="Théate">Vincent Théate</name><affiliation wicri:level="4"><nlm:aff id="aff1"><addr-line>Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium</addr-line></nlm:aff><country xml:lang="fr">Belgique</country><wicri:regionArea>Institute of Neuroscience, Université catholique de Louvain, Brussels</wicri:regionArea><placeName><settlement type="city">Bruxelles</settlement><region nuts="2">Région de Bruxelles-Capitale</region></placeName><orgName type="university">Université catholique de Louvain</orgName></affiliation></author><author><name sortKey="Hayward, Vincent" sort="Hayward, Vincent" uniqKey="Hayward V" first="Vincent" last="Hayward">Vincent Hayward</name><affiliation wicri:level="1"><nlm:aff id="aff2"><addr-line>UPMC Univ Paris, Institut des Systèmes Intelligents et de Robotique, Paris, France</addr-line></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea>UPMC Univ Paris, Institut des Systèmes Intelligents et de Robotique, Paris</wicri:regionArea><placeName><settlement type="city">Paris</settlement></placeName></affiliation></author><author><name sortKey="Thonnard, Jean Louis" sort="Thonnard, Jean Louis" uniqKey="Thonnard J" first="Jean-Louis" last="Thonnard">Jean-Louis Thonnard</name><affiliation wicri:level="4"><nlm:aff id="aff1"><addr-line>Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium</addr-line></nlm:aff><country xml:lang="fr">Belgique</country><wicri:regionArea>Institute of Neuroscience, Université catholique de Louvain, Brussels</wicri:regionArea><placeName><settlement type="city">Bruxelles</settlement><region nuts="2">Région de Bruxelles-Capitale</region></placeName><orgName type="university">Université catholique de Louvain</orgName></affiliation></author></analytic><series><title level="j">PLoS ONE</title><idno type="eISSN">1932-6203</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background</title><p>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 <italic>Pleasant Touch Scale</italic>, 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.</p></sec><sec><title>Results</title><p>Eight blindfolded participants tactually explored twelve materials of the <italic>Pleasant Touch Scale</italic> through lateral sliding movements of their index fingertip. During exploration, the normal and tangential interaction force components, <italic>f<sub>N</sub></italic> and <italic>f<sub>T</sub></italic>, 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 <italic>f<sub>T</sub></italic> to <italic>f<sub>N</sub></italic>, i.e. the net coefficient of kinetic friction, <italic>μ</italic>. The influence of the surface topographies was investigated through analysis of rapid <italic>f<sub>T</sub></italic> fluctuations in the spatial frequency domain. Results showed that high values of <italic>μ</italic> were anticorrelated with pleasantness. Furthermore, surfaces associated with fluctuations of <italic>f<sub>T</sub></italic> 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.</p></sec><sec><title>Conclusion</title><p>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.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Bensmaia, Sj" uniqKey="Bensmaia S">SJ Bensmaia</name></author><author><name sortKey="Hollins, M" uniqKey="Hollins M">M Hollins</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Delhaye, B" uniqKey="Delhaye B">B Delhaye</name></author><author><name sortKey="Hayward, V" uniqKey="Hayward V">V Hayward</name></author><author><name 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