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  3D hand-motion tracking and bottom-up classification sheds light on the physical properties of gentle stroking

Lo, C., Ting Chu, S., Penney, T. B., & Schirmer, A. (2020). 3D hand-motion tracking and bottom-up classification sheds light on the physical properties of gentle stroking. Neuroscience. doi:10.1016/j.neuroscience.2020.09.037.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-1F90-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-1F91-3
Genre: Journal Article

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 Creators:
Lo, Clive1, Author
Ting Chu, Sai1, Author
Penney, Trevor B.1, Author
Schirmer, Annett1, 2, 3, Author              
Affiliations:
1Department of Psychology, Chinese University of Hong Kong, China, ou_persistent22              
2Brain and Mind Institute, Chinese University of Hong Kong, China, ou_persistent22              
3Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              

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Free keywords: C-tactile; Affective touch; Motion; Social touch; Trajectory
 Abstract: Despite much research on the perception of gentle stroking, its motion characteristics and modulation by social intent remain largely unknown. Here we addressed this situation by asking volunteers to gently stroke a dog, the arm of their romantic partner, their own arm, or a foam arm in a pleasant manner, as if to provide comfort, or as fast/slow as possible. Stroking motion was tracked with a sensor attached to the back of the hand and processed using MPAL, a new 3D motion analysis tool. Statistical testing was both hypothesis-driven and exploratory. Hypothesis-driven tests revealed comparable stroking velocities for social (dog, partner) and non-social touch targets, but an overall slower velocity for pleasant and slow as compared with fast stroking. Additionally, stroking a social target or with a pleasant intent entailed less motion along the target's front/back axis, increased motion along the left/right axis and increased temporal variability between main strokes. An exploratory linear discriminant analysis on 26 motion features revealed that stroking a social target was more distinct than stroking in a pleasant manner and that the former, and to a lesser extent the latter, were strongly associated with features indexing spatio-temporal variability. Thus, touchers socially tune their stroking motion by reducing its predictability, which may make the touchee's experiences more pleasurable by facilitating the differentiation between self- and other touch. Together, our results offer useful directions for future research on gentle stroking and emphasize the need to consider the natural physical properties of touch.

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Language(s): eng - English
 Dates: 2020-09-112020-02-292020-09-162020-09-29
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.neuroscience.2020.09.037
Other: online ahead of print
PMID: 33007405
 Degree: -

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Title: Neuroscience
Source Genre: Journal
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 0306-4522
CoNE: https://pure.mpg.de/cone/journals/resource/954925514498