A study on tactile resolution of human skin

In a previous paper, we proposed a hypothesis on human tactile resolution that "if we control appropriate two degree-of-freedom stimuli with intervals of a half of TPDT, we can produce any touch sensation that can be generated by normal stress distributions". However, since the apparatus was inadequate, the hypothesis was not examined clearly. The main cause of the inadequacy was that the stimulator was based on displacement control. In this paper, we fabricate a new tactile stimulator based on pressure control and obtain experimental results that support the hypothesis.