Abstract
The threshold amplitude for tactile sensation was measured on the finger pads of normal adults using half cycle sinusoidal mechanical pulses. The threshold was about 5 μm for pulses producing rapid skin displacements. With slow pulse stimulation, a sharp rise in threshold to above 80 μm was recorded at a displacement rate of about 0.1 mm/sec. The threshold gap (difference limen) was a fraction of the threshold, on average 27%. The low threshold for rapid pulses is most probably mediated by pacinian corpuscles. The threshold rise on slow pulse stimulation indicates a transfer of the sensation to another type of units which may be the slowly adapting type I.
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