Document Detail

Some shear facts and pure friction related to roughness discrimination and the cutaneous control of grasping.
MedLine Citation:
PMID:  7954089     Owner:  NLM     Status:  MEDLINE    
The question of whether friction contributes to the perception of roughness has been overdebated and underinvestigated. A review of the psychophysical literature suggests that roughness and friction can be subjectively distinguished very effectively, although the same rapidly adapting Meissner corpuscles (RA1s) and slowly adapting Merkel receptors (SA1s) are stimulated by both stimuli. It appears that to achieve the subjective appreciation of roughness, the brain must learn to ignore variations in the speed of movement over the skin, the perpendicular force applied to the receptor surface, and the shear forces tangential to the skin generated by friction. Similarly, the subjective appreciation of slipperiness requires selective attention to tangential forces to the exclusion of speed, perpendicular force, and surface texture. A clearer picture is gradually emerging concerning the detection and appreciation of shear forces from investigations of the grasping and lifting of objects of different surfaces against the force of gravity. Although high shear forces provoke larger responses in almost all skin mechano-receptors, some neurons in both the sensory and motor cortex discharge more vigorously with smooth textures and lower coefficients of friction. Although populations of such neurons sensitive to smooth surfaces and low friction would be very useful in detecting both potential and real slips, just how the afferent signals are derived remains puzzling.
A M Smith
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Canadian journal of physiology and pharmacology     Volume:  72     ISSN:  0008-4212     ISO Abbreviation:  Can. J. Physiol. Pharmacol.     Publication Date:  1994 May 
Date Detail:
Created Date:  1994-12-02     Completed Date:  1994-12-02     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0372712     Medline TA:  Can J Physiol Pharmacol     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  583-90     Citation Subset:  IM; S    
Département de physiologie, Université de Montréal, QC, Canada.
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MeSH Terms
Discrimination Learning*
Form Perception / physiology*
Hand / physiology
Hand Strength / physiology*
Skin Physiological Phenomena*
Touch / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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