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1. Single unit impulses were recorded from the ulnar and median nerves of awake human subjects with tungsten electrodes inserted percutaneously in the upper arm.
2. Forty-nine rapidly adapting mechanoreceptors with receptive fields in the glabrous skin area were studied. Thirty-nine units had small receptive fields with distinct borders (RA-receptors) while ten units had large fields with indistinct borders (PC-receptors).
3. The afferent response to stimuli of varying indentation amplitude and velocity of indentation, was analysed.
4. Amplitude thresholds varied from 0·05 to 1·65 mm for the RA-receptors. For the PC-receptors amplitude thresholds ranged from less than 0·05 to 1·95 mm.
5. Velocity thresholds varied for the RA-receptors from 0·4 to 39·3 mm/sec, and for the PC-receptors from 0·5 to 19·6 mm/sec.
6. The conduction velocities of the afferents were all in the A 
—
range. For the RA-receptors the conduction velocities ranged from 26 to 91 m/sec (mean = 55·3 ± 3·4), and for PC-receptors the range was from 34 to 61 m/sec (mean = 46·9 ± 3·6).
7. The nerve impulse frequency as a function of indentation velocity was analysed for nineteen RA-receptors and four PC-receptors. A hyperbolic log tangent function of the type first introduced by Naka & Rushton (1966) in studies on S-potentials in the fish retina was found to be the best description of the stimulus—response function for sixteen RA-receptors and two PC-receptors. For the remaining units a pure logarithmic function was the best description. However, the logarithmic function may be, as found in the present study, a special case of the more general log tanh function.
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