Abstract
The lack of understanding of the threshold on the basic physical factors forming rough sense of basic hinders the study of tactile roughness sensation. In this paper, differential threshold and Weber fraction are investigated for clearer understanding of how physical factors affect the roughness sensation by the constant stimulus method and the paired comparison method. The results show that the differential threshold for the mean deviation of surface profile is 0.86 μm and that the differential threshold of texture spatial period is 2.48 mm. As there is an interaction between the roughness indexes, any of the indexes alone cannot represent roughness sensation.
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