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Sensitivity to vibration on the hand was determined as a function of frequency, contactor dimensions, contactor configuration, and distance of the contactor from a rigid support. It was found that each of these parameters affects the threshold in a different way. In the frequency range between 25 and 640 cps, the absolute threshold as a function of frequency yields a U-shaped curve that reaches a maximum of sensitivity in the region of 250 cps. The effect of the geometric parameters appears to be highly complex.
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Ronald T. Verrillo (1962) studied this question.
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