Tactile sensibility in the human hand: receptive field characteristics of mechanoreceptive units in the glabrous skin area

The Journal of Physiology
R S Johansson

Abstract

1. Impulses in tactile units innervating the glabrous skin of the hand recorded from the median nerve of adult human subjects. The recording electrodes which were made of tungsten were inserted percutaneously in the upper arm. 2. The units were classified on the basis of their sensitivity to sustained identation and to remote stimuli. Two types of rapidly adapting units and two types of slowly adapting units were found. In accordance with earlier reports they were denoted RA and PC units, and SA I and SA II units. 3. The sensitivity profiles of the receptive fields were analysed by measuring the extent of the receptive field as a function of the identation amplitude. 4. The RA and SA I units had receptive fields with several zones of maximal sensitivity distributed over an approximately circular or oval area typically covering five to ten papillary ridges. Within this area the sensitivity was high, whereas the sensitivity diminished steeply with increasing distance from this area. 5. The PC and SA II units had receptive fields with a single zone of maximal sensitivity and gentle continuous threshold increase outside this zone. 6. The relation between the identation amplitude and the receptive field size of a unit was described...Continue Reading

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