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Journal of Neuroscience, Vol 15, 798-810, Copyright © 1995 by Society for Neuroscience
Representation of curved surfaces in responses of mechanoreceptive afferent fibers innervating the monkey's fingerpad
AW Goodwin, AS Browning and HE Wheat
Department of Anatomy and Cell Biology, University of Melbourne, Parkville, Victoria, Australia.
The aim was to elucidate how the population of digital nerve afferents
signals information about the shape of objects in contact with the
fingerpads during fine manipulations. Responses were recorded from single
mechanoreceptive afferent fibers in median nerves of anesthetized monkeys.
Seven spherical surfaces were used, varying from a highly curved surface
(radius, 1.44 mm; curvature, 694 m-1) to a flat surface (radius, infinity;
curvature, 0 m-1). These were applied to the fibers' receptive fields,
which were located on the central portion of a fingerpad. When the objects
were located at the centers of the receptive fields, the responses of the
slowly adapting fibers (SAIs) increased as the curvature of the surface
increased and as the contact force increased. All SAIs behaved in the same
way, differing only by a scaling factor (the sensitivity of the individual
afferent). Responses of the rapidly adapting afferents were small and did
not vary systematically with the stimulus parameters, and most Pacinians
did not respond at all. Stimuli were applied at different positions in the
receptive fields of SAIs to define the response profiles of the afferents
(response as a function of position on the fingerpad). All SAIs had
similarly shaped profiles for the same surface curvature and the shape
differed for different curvatures. These profiles reflected the shape of
the stimulus. An increase in contact force scaled these profiles upward.
Thus, the population of digital nerve fibers signals unambiguous
information about the shape and contact force of curved surfaces contacting
the fingerpad.
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