Physical factors influencing pleasant touch during passive fingertip stimulation.

<h4>Objective</h4>Tactile explorations with the fingertips provide information regarding the physical properties of surfaces and their relative pleasantness. Previously, we performed an investigation in the active touch domain and linked several surface properties (i.e. frictional force...

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Autores principales:	Anne Klöcker, Calogero Maria Oddo, Domenico Camboni, Massimo Penta, Jean-Louis Thonnard
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/473f28f6d14a45f3828095cf87610a3b
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id	oai:doaj.org-article:473f28f6d14a45f3828095cf87610a3b
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spelling	oai:doaj.org-article:473f28f6d14a45f3828095cf87610a3b2021-11-25T06:09:27ZPhysical factors influencing pleasant touch during passive fingertip stimulation.1932-620310.1371/journal.pone.0101361https://doaj.org/article/473f28f6d14a45f3828095cf87610a3b2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25000561/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Objective</h4>Tactile explorations with the fingertips provide information regarding the physical properties of surfaces and their relative pleasantness. Previously, we performed an investigation in the active touch domain and linked several surface properties (i.e. frictional force fluctuations and net friction) with their pleasantness levels. The aim of the present study was to investigate physical factors being important for pleasantness perception during passive fingertip stimulation. Specifically we were interested to see whether factors, such as surfaces' topographies or their frictional characteristics could influence pleasantness. Furthermore, we ascertained how the stimulus pleasantness level was impacted by (i) the normal force of stimulus application (FN) and (ii) the stimulus temperature (TS).<h4>Methods and results</h4>The right index fingertips of 22 blindfolded participants were stimulated using 27 different stimuli, which varied in average roughness (Ra) and TS. A 4-axis robot moved the stimuli horizontally under participants' fingertips with three levels of FN. The robot was equipped with force sensors, which recorded the FN and friction force (FT) during stimulation. Participants rated each stimulus according to a three-level pleasantness scale, as very pleasant (scored 0), pleasant (scored 1), or unpleasant (scored 2). These ordinal pleasantness ratings were logarithmically transformed into linear and unidimensional pleasantness measures with the Rasch model. Statistical analyses were conducted to investigate a possible link between the stimulus properties (i.e. Ra, FN, FT, and TS) and their respective pleasantness levels. Only the mean Ra and FT values were negatively correlated with pleasantness. No significant correlation was detected between FN or TS and pleasantness.<h4>Conclusion</h4>Pleasantness perception, resulting from passive fingertip stimulation, seems to be influenced by the surfaces' average roughness levels and average FT occurring during fingertip stimulation.Anne KlöckerCalogero Maria OddoDomenico CamboniMassimo PentaJean-Louis ThonnardPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 7, p e101361 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Anne Klöcker Calogero Maria Oddo Domenico Camboni Massimo Penta Jean-Louis Thonnard Physical factors influencing pleasant touch during passive fingertip stimulation.
description	<h4>Objective</h4>Tactile explorations with the fingertips provide information regarding the physical properties of surfaces and their relative pleasantness. Previously, we performed an investigation in the active touch domain and linked several surface properties (i.e. frictional force fluctuations and net friction) with their pleasantness levels. The aim of the present study was to investigate physical factors being important for pleasantness perception during passive fingertip stimulation. Specifically we were interested to see whether factors, such as surfaces' topographies or their frictional characteristics could influence pleasantness. Furthermore, we ascertained how the stimulus pleasantness level was impacted by (i) the normal force of stimulus application (FN) and (ii) the stimulus temperature (TS).<h4>Methods and results</h4>The right index fingertips of 22 blindfolded participants were stimulated using 27 different stimuli, which varied in average roughness (Ra) and TS. A 4-axis robot moved the stimuli horizontally under participants' fingertips with three levels of FN. The robot was equipped with force sensors, which recorded the FN and friction force (FT) during stimulation. Participants rated each stimulus according to a three-level pleasantness scale, as very pleasant (scored 0), pleasant (scored 1), or unpleasant (scored 2). These ordinal pleasantness ratings were logarithmically transformed into linear and unidimensional pleasantness measures with the Rasch model. Statistical analyses were conducted to investigate a possible link between the stimulus properties (i.e. Ra, FN, FT, and TS) and their respective pleasantness levels. Only the mean Ra and FT values were negatively correlated with pleasantness. No significant correlation was detected between FN or TS and pleasantness.<h4>Conclusion</h4>Pleasantness perception, resulting from passive fingertip stimulation, seems to be influenced by the surfaces' average roughness levels and average FT occurring during fingertip stimulation.
format	article
author	Anne Klöcker Calogero Maria Oddo Domenico Camboni Massimo Penta Jean-Louis Thonnard
author_facet	Anne Klöcker Calogero Maria Oddo Domenico Camboni Massimo Penta Jean-Louis Thonnard
author_sort	Anne Klöcker
title	Physical factors influencing pleasant touch during passive fingertip stimulation.
title_short	Physical factors influencing pleasant touch during passive fingertip stimulation.
title_full	Physical factors influencing pleasant touch during passive fingertip stimulation.
title_fullStr	Physical factors influencing pleasant touch during passive fingertip stimulation.
title_full_unstemmed	Physical factors influencing pleasant touch during passive fingertip stimulation.
title_sort	physical factors influencing pleasant touch during passive fingertip stimulation.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/473f28f6d14a45f3828095cf87610a3b
work_keys_str_mv	AT anneklocker physicalfactorsinfluencingpleasanttouchduringpassivefingertipstimulation AT calogeromariaoddo physicalfactorsinfluencingpleasanttouchduringpassivefingertipstimulation AT domenicocamboni physicalfactorsinfluencingpleasanttouchduringpassivefingertipstimulation AT massimopenta physicalfactorsinfluencingpleasanttouchduringpassivefingertipstimulation AT jeanlouisthonnard physicalfactorsinfluencingpleasanttouchduringpassivefingertipstimulation
_version_	1718414097612013568

Physical factors influencing pleasant touch during passive fingertip stimulation.

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