Sensitivity of the Skin to Changes in Rate of Intermittent Mechanical Stimuli

The procedure used on the skin of the fingertip was to measure difference-limens (DLs) for the rate of intermittent mechanical pulses at pulse repetition rates of 1 to 320 cps. The general method was the same as that used on the eye and the ear. In four experiments, three different kinds of electrically actuated mechanical stimulators were used: a modified loud speaker motor, a magnetic phonograph cutting head, and a miniature vibration generator.