Modeling of biomechanics of two-point discrimination tests of fingertip.
Wu-JZ; Dong-RG; Rakheja-S; Schopper-AW; Smutz-WP
Proceedings of the 36th UK Group Conference on Human Response to Vibration, 12-14 September, 2001, Farnborough, England. LN Cox, CI Arrowsmith, SR Holmes, eds. Farnborough, England: Centre for Human Sciences, 2001 Sep; :322-332
A two-dimensional model is proposed that incorporates the essential anatomical structures of a finger: skin, subcutaneous tissue, bone, and nail. The skin tissue is assumed to be hyperelastic and viscoelastic. The subcutaneous tissues is considered to be a nonlinear, biphasic material composed of a hyperelastic solid and an invicid fluid phase. The nail and bone are considered to be linearly elastic. The proposed model is applied to simulate the mechanical responses of a fingertip in one-point (1PT) and two-poin (2PT) tactile discrimination tests. In case of two-point tests, the effects of static and dynamic indentations on the stress/strain distributions within the soft tissues at fingertip have been studied numerically. Assuming the mechanoreceptors in the dermis sense the stimuli associated with normal strains (the vertical and horizontal strains) and strain energy density, our numerical results suggest that the threshold of 2PT discrimination may lie between 2.0 mm and 3.0 mm, which is consistent with the published experimental data.
Biomechanics; Biomechanical-modeling; Models; Simulation-methods; Mechanical-tests
Cox-LN; Arrowsmith-CI; Holmes-SR
36th UK Group Conference on Human Response to Vibration