Abstract
This paper investigates individual differences in exerted contact force on the basis of skin-propagated vibration that is elicited when rubbing an object. Contact force and skin vibration were measured when participants spontaneously rubbed eight different textures with their fingertip and subsequently, the same experiment was conducted with about half or twice the spontaneous force. The results showed that individual difference in the skin vibration was smaller than that in the spontaneous contact force. Furthermore, the results in different forces showed that intensity of the skin vibration was increased with increase of the contact force, but its coefficient of variance among different textures tended to be decreased with increase of the contact force. Thus, humans might spontaneously use a contact force in order to obtain the skin vibration having a somewhat strong intensity and great variation for textures.
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