Physical determinants of the shape of the psychophysical curve relating tactile 1 roughness to raised - dot spacing : implications for neuronal coding of roughness
نویسندگان
چکیده
17 Address to which correspondence should be sent: 18 C. Elaine Chapman 19 Département de physiologie 20 Université de Montréal 21 PO Box 6128, Succursale centre ville 22 Montréal, Québec H3C 3J7 23 Canada 24 25 Tel : 514-343-2304 26 Fax : 514-343-6113 27 e-mail : [email protected] 28 29 30 Running title: Tactile roughness perception 31 32
منابع مشابه
Physical determinants of the shape of the psychophysical curve relating tactile roughness to raised-dot spacing: implications for neuronal coding of roughness.
There are conflicting reports as to whether the shape of the psychometric relation between perceived roughness and tactile element spacing [spatial period (SP)] follows an inverted U-shape or a monotonic linear increase. This is a critical issue because the former result has been used to assess neuronal codes for roughness. We tested the hypothesis that the relation's shape is critically depend...
متن کاملTactile perception of nonpainful unpleasantness in relation to perceived roughness: effects of inter-element spacing and speed of relative motion of rigid 2-D raised-dot patterns at two body loci.
Rigid surfaces consisting of spatially jittered 2-D raised-dot patterns with different inter-element spacings were moved back and forth across the skin at three different speeds (10-fold range). Within each psychophysical experiment, participants numerically estimated the perceived magnitude of either unpleasantness (nonpainful) or roughness of 2-D raised-dot surfaces applied to two stationary ...
متن کاملTactile roughness: neural codes that account for psychophysical magnitude estimates.
Hypothetical neural codes underlying the sensation of tactile roughness were investigated in a combined psychophysical and neurophysiological study. The stimulus set consisted of plastic surfaces embossed with dot arrays of varying dot diameter and center-to-center spacing. Human subjects explored each surface with the pad of the index finger and reported their subjective sense of roughness mag...
متن کاملTactile roughness perception with a rigid link interposed between skin and surface.
Subjects made roughness judgments of textured surfaces made of raised elements, while holding stick-like probes or through a rigid sheath mounted on the fingertip. These rigid links, which impose vibratory coding of roughness, were compared with the finger (bare or covered with a compliant glove), using magnitude-estimation and roughness differentiation tasks. All end effectors led to an increa...
متن کاملA Variation Code Accounts for the Perceived Roughness of Coarsely Textured Surfaces
For decades, the dominant theory of roughness coding in the somatosensory nerves posited that perceived roughness was determined by the spatial pattern of activation in one population of tactile nerve fibers, namely slowly adapting type 1 (SA1) afferents. Indeed, the perceived roughness of coarsely textured surfaces tracks the spatial variation in SA1 responses - the degree to which response st...
متن کامل