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Getting a Feel for Tactile Space: Exploring Haptic Perception of Microtexture
Stockholm University, Faculty of Social Sciences, Department of Psychology.
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present thesis is based on three studies that research different aspects of fine texture perception. The goal is to better understand the mechanisms involved in haptic perception of textures below 200 µm, also known as microtextures. Study I was conducted to establish a friction measurement model and relating the friction measurements to perceived coarseness of fine textures. A set of printing papers was used as stimulus material. In Study II an expanded set, including the set of Study I, was used as stimuli in a multidimensional scaling (MDS) experiment of haptic fine texture perception. Through scaling of perceptual attributes and similarities, a three dimensional space was found to best describe the data and the dimensions were interpreted as rough-smooth, thick-thin and distinct-indistinct. In Study III a series of model surfaces were manufactured with a systematically varied sinusoidal pattern, spanning from 300 nm to 80 µm. As in Study II, a similarity experiment was conducted and a two dimensional space was chosen, the dimensions of which were explained well through friction and the wavelength. Together these three studies form a better picture of fine texture perception. The dimensionality found with paper stimuli was very similar to the corresponding spaces for marcrotextures of everyday materials, even though a different perceptual system is used for fine texture perception. Regardless if the information is coded through the spatial or the vibratory sense, the perception does not seem to differ in dimensionality. Further, the largest among the microtextures seem to have been perceived as carrying spatial information. On the systematically varied, rigid, textures, the MDS space did not come out in a similar fashion to those of everyday materials but instead similar to the physical properties that characterizes the change in the textures. It was further found that the participants in Study III successfully discriminated textures with an amplitude of 13 nm from the unwrinkled surfaces. From these studies the main conclusions are (a) haptically measured friction and surface roughness are important contributors to fine texture perception, (b) even at microscales, spatial information is retrieved haptically, probably through vibrations, and (c) persons can haptically discriminate textures at a nanoscale.

Place, publisher, year, edition, pages
Stockholm: Department of Psychology, Stockholm Univeristy , 2012. , 62 p.
Keyword [en]
Haptic, fine texture perception, multidimensional scaling, tactile, roughness, vibrations, spatial
National Category
Psychology
Research subject
Psychology
Identifiers
URN: urn:nbn:se:su:diva-82593ISBN: 978-91-7447-608-8 (print)OAI: oai:DiVA.org:su-82593DiVA: diva2:570762
Public defence
2012-12-21, David Magnussonsalen (U31), hus 8, Frescati Hagväg 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2012-11-29 Created: 2012-11-19 Last updated: 2012-11-21Bibliographically approved
List of papers
1. Tactile perception: Finger friction, surface roughness and perceived coarseness
Open this publication in new window or tab >>Tactile perception: Finger friction, surface roughness and perceived coarseness
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2011 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 44, no 5, 505-512 p.Article in journal (Refereed) Published
Abstract [en]

Finger friction measurements performed on a series of printing papers are evaluated to determine representativeness of a single individual. Results show occasionally large variations in friction coefficients. Noteworthy though is that the trends in friction coefficients are the same, where coated (smoother) papers display higher friction coefficients than uncoated (rougher) papers. The present study also examined the relationship between the measured friction coefficients and surface roughness to the perceived coarseness of the papers. It was found that both roughness and finger friction can be related to perceived coarseness, where group data show that perceived coarseness increases with increasing roughness.

Keyword
finger friction, paper friction, roughness, perception
National Category
Psychology
Research subject
Psychology
Identifiers
urn:nbn:se:su:diva-68544 (URN)10.1016/j.triboint.2010.04.010 (DOI)000289398900001 ()
Note
authorCount :9Available from: 2012-01-04 Created: 2012-01-04 Last updated: 2017-12-08Bibliographically approved
2. Haptic Perception of Fine Surface Texture: Psychophysical Interpretation of the Multidimensional Space
Open this publication in new window or tab >>Haptic Perception of Fine Surface Texture: Psychophysical Interpretation of the Multidimensional Space
(English)Manuscript (preprint) (Other academic)
Keyword
Haptic perception, psychophysics, touch, similarity, multidimensional scaling, surface feel, finger friction, fine-surface texture, roughness, coolness
National Category
Social Sciences
Identifiers
urn:nbn:se:su:diva-82589 (URN)
Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2012-11-20Bibliographically approved
3. Feeling Small: Exploring the Tactile Perception Limits
Open this publication in new window or tab >>Feeling Small: Exploring the Tactile Perception Limits
(English)Manuscript (preprint) (Other academic)
National Category
Social Sciences
Identifiers
urn:nbn:se:su:diva-82587 (URN)
Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2012-11-20

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Citation style
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