Discriminating smooth from grooved surfaces: effects of random variations in skin penetration View Full Text


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Article Info

DATE

2008-07

AUTHORS

James C. Craig, Roger P. Rhodes, Gregory O. Gibson, Sliman J. Bensmaia

ABSTRACT

The ability to discriminate a smooth surface from a grooved one depends on several variables, including the width of the grooves and the force with which the skin is contacted. It has been hypothesized that this smooth-grooved discrimination with statically presented stimuli is based on intensity cues, namely, the overall difference in perceived intensity between the smooth and grooved surfaces. To test this hypothesis, the perceived intensities of test stimuli were varied on a trial-by-trial basis by varying the depth of penetration the contactor was allowed to travel into the skin. As compared to a control condition in which stimuli were presented with the same average penetration and contrary to the hypothesis, random variations in penetration produced no decline in smooth-grooved performance. The total amount of conformance was an accurate predictor of sensitivity across various penetrations and across two test sites (distal finger pad and finger base). It appears that subjects are making absolute rather than comparative judgments in the smooth-grooved task. A recently developed continuum mechanical model of the responses of first-order mechanoreceptive afferents to static stimuli provided both a good fit to the data and indicated what aspect of the peripheral neural image was relevant for discriminating smooth surfaces from grooved surfaces. More... »

PAGES

331-340

References to SciGraph publications

  • 1990-08. Representation of braille characters in human nerve fibres in EXPERIMENTAL BRAIN RESEARCH
  • 2004-01. Fingertip skin conformance accounts, in part, for differences in tactile spatial acuity in young subjects, but not for the decline in spatial acuity with aging in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 2002-10. Relative roles of spatial and intensive cues in the discrimination of spatial tactile stimuli in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 1975-01. Tactile roughness of grooved surfaces: A model and the effect of friction in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 2001-02. A comparison of tactile spatial sensitivity on the palm and fingerpad in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 2006-04. The effect of force and conformance on tactile intensive and spatial sensitivity in EXPERIMENTAL BRAIN RESEARCH
  • 2005-08. Tactile spatial sensitivity and anisotropy in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 1996. Form processing and attention effects in the somatosensory system in SOMESTHESIS AND THE NEUROBIOLOGY OF THE SOMATOSENSORY CORTEX
  • 1972-03. Difference threshold for intensity of tactile stimuli in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 1974-01. Vibrotactile difference thresholds for intensity and the effect of a masking stimulus in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00221-008-1363-3

    DOI

    http://dx.doi.org/10.1007/s00221-008-1363-3

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1008830440

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/18443774


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