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In humans, the tactile perception of fine textures is mediated by skinvibrations when scanning the surface with the fingertip. These vibrations areencoded by specific mechanoreceptors, Pacinian corpuscules (PCs), located about2 mm below the skin surface. In a recent article, we performed experimentsusing a biomimetic sensor which suggest that fingerprints (epidermal ridges)may play an important role in shaping the subcutaneous stress vibrations in away which facilitates their processing by the PC channel. Here we further testthis hypothesis by directly recording the modulations of thefingerpad/substrate friction force induced by scanning an actual fingertipacross a textured surface. When the fingerprints are oriented perpendicular tothe scanning direction, the spectrum of these modulations shows a pronouncedmaximum around the frequency v/lambda, where v is the scanning velocity andlambda the fingerprints period. This simple biomechanical result confirms therelevance of our previous finding for human touch.

Effect of fingerprints orientation on skin vibrations during tactile exploration of textured surfaces