Physical factors influencing pleasant touch during tactile exploration
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...
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| Veröffentlicht in: | PloS one 2013-11, Vol.8 (11), p.e79085-e79085 |
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| creator | Klöcker, Anne Wiertlewski, Michael Théate, Vincent Hayward, Vincent Thonnard, Jean-Louis |
| description | 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.
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.
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. |
| doi_str_mv | 10.1371/journal.pone.0079085 |
| format | Article |
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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.
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.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0079085</identifier><identifier>PMID: 24244425</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Adult ; Amplitudes ; Automatic ; Correlation analysis ; Engineering Sciences ; Exploration ; Female ; Fluctuations ; Frequency dependence ; Friction ; Humans ; Kinetic coefficients ; Kinetic friction ; Life Sciences ; Male ; Neurons and Cognition ; Neurosciences ; Physical factors ; Pleasure - physiology ; Scanning ; Sensors ; Sliding ; Spatial distribution ; Topography ; Touch ; Touch Perception - physiology ; Trajectory measurement</subject><ispartof>PloS one, 2013-11, Vol.8 (11), p.e79085-e79085</ispartof><rights>COPYRIGHT 2013 Public Library of Science</rights><rights>2013 Klöcker et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>Attribution</rights><rights>2013 Klöcker et al 2013 Klöcker et al</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c792t-33a3efee629ed3443639ec8c6b3c301a0bfdb9665930063eded688cf3904a2953</citedby><cites>FETCH-LOGICAL-c792t-33a3efee629ed3443639ec8c6b3c301a0bfdb9665930063eded688cf3904a2953</cites><orcidid>0000-0002-2102-1965</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC3828339/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC3828339/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,723,776,780,860,881,2096,2915,23845,27901,27902,53766,53768,79343,79344</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/24244425$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://hal.sorbonne-universite.fr/hal-01669245$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Klöcker, Anne</creatorcontrib><creatorcontrib>Wiertlewski, Michael</creatorcontrib><creatorcontrib>Théate, Vincent</creatorcontrib><creatorcontrib>Hayward, Vincent</creatorcontrib><creatorcontrib>Thonnard, Jean-Louis</creatorcontrib><title>Physical factors influencing pleasant touch during tactile exploration</title><title>PloS one</title><addtitle>PLoS One</addtitle><description>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.
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.
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.</description><subject>Adult</subject><subject>Amplitudes</subject><subject>Automatic</subject><subject>Correlation analysis</subject><subject>Engineering Sciences</subject><subject>Exploration</subject><subject>Female</subject><subject>Fluctuations</subject><subject>Frequency dependence</subject><subject>Friction</subject><subject>Humans</subject><subject>Kinetic coefficients</subject><subject>Kinetic friction</subject><subject>Life Sciences</subject><subject>Male</subject><subject>Neurons and Cognition</subject><subject>Neurosciences</subject><subject>Physical factors</subject><subject>Pleasure - physiology</subject><subject>Scanning</subject><subject>Sensors</subject><subject>Sliding</subject><subject>Spatial distribution</subject><subject>Topography</subject><subject>Touch</subject><subject>Touch Perception - 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Academic</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Klöcker, Anne</au><au>Wiertlewski, Michael</au><au>Théate, Vincent</au><au>Hayward, Vincent</au><au>Thonnard, Jean-Louis</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Physical factors influencing pleasant touch during tactile exploration</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2013-11-14</date><risdate>2013</risdate><volume>8</volume><issue>11</issue><spage>e79085</spage><epage>e79085</epage><pages>e79085-e79085</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><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 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.
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.
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.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>24244425</pmid><doi>10.1371/journal.pone.0079085</doi><tpages>e79085</tpages><orcidid>https://orcid.org/0000-0002-2102-1965</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Adult Amplitudes Automatic Correlation analysis Engineering Sciences Exploration Female Fluctuations Frequency dependence Friction Humans Kinetic coefficients Kinetic friction Life Sciences Male Neurons and Cognition Neurosciences Physical factors Pleasure - physiology Scanning Sensors Sliding Spatial distribution Topography Touch Touch Perception - physiology Trajectory measurement |
| title | Physical factors influencing pleasant touch during tactile exploration |
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