Feeling Small: Exploring the Tactile Perception Limits
2013 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 3, 2617- p.Article in journal (Refereed) Published
The human finger is exquisitely sensitive in perceiving different materials, but the question remains as to what length scales are capable of being distinguished in active touch. We combine material science with psychophysics to manufacture and haptically explore a series of topographically patterned surfaces of controlled wavelength, but identical chemistry. Strain-induced surface wrinkling and subsequent templating produced 16 surfaces with wrinkle wavelengths ranging from 300 nm to 90 mu m and amplitudes between 7 nm and 4.5 mu m. Perceived similarities of these surfaces (and two blanks) were pairwise scaled by participants, and interdistances among all stimuli were determined by individual differences scaling (INDSCAL). The tactile space thus generated and its two perceptual dimensions were directly linked to surface physical properties - the finger friction coefficient and the wrinkle wavelength. Finally, the lowest amplitude of the wrinkles so distinguished was approximately 10 nm, demonstrating that human tactile discrimination extends to the nanoscale.
Place, publisher, year, edition, pages
2013. Vol. 3, 2617- p.
Natural Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:su:diva-94732DOI: 10.1038/srep02617ISI: 000324228600001OAI: oai:DiVA.org:su-94732DiVA: diva2:655128
CODIRECT - the Controlled Delivery and Release Centre at YKI Institute for Surface Chemistry; Vinnova Knowledge Foundation; Swedish Research Council; Foundation for Strategic Research (SSF); EU 2013-10-102013-10-092013-10-10Bibliographically approved