Goodwin A W, John K T, Marceglia A H
Department of Anatomy, University of Melbourne, Parkville, Victoria, Australia.
Exp Brain Res. 1991;86(3):663-72. doi: 10.1007/BF00230540.
Spherically curved surfaces were applied, with controlled force, to the fingerpads of human subjects; their fingers were immobilized. The curvature of the surfaces was characterised by the reciprocal of the radius of curvature. In scaling experiments, the subjects' perceived magnitude of curvature increased markedly with an increase in the curvature of the stimulus. An increase in contact force resulted in a slight decrease in perceived curvature. Four discrimination experiments were performed using a forced choice paradigm. Subjects could discriminate, at the 75% level, a flat surface (zero curvature) from a convex curvature of 4.9 m-1 (radius of curvature 204 mm) and from a concave curvature of 5.4 m-1 (radius 185 mm). When discriminating 2 convex spherical surfaces, subjects could discriminate a curvature of 144 m-1 from a curvature of 158 m-1 (radii 6.95 and 6.33 mm respectively), and could discriminate a curvature of 287 m-1 from one of 319 m-1 (radii 3.48 and 3.13 mm respectively); the Weber fraction is about 0.1. Contact areas between the curved surfaces and the fingerpad skin were estimated. There was approximate correspondence between contact areas and the scaling functions.
将具有可控力的球形曲面应用于人类受试者的指腹；他们的手指被固定住。曲面的曲率由曲率半径的倒数来表征。在缩放实验中，随着刺激曲率的增加，受试者感知到的曲率大小显著增加。接触力的增加导致感知曲率略有下降。使用强制选择范式进行了四项辨别实验。受试者能够在75%的水平上区分平坦表面（零曲率）与4.9 m⁻¹的凸曲率（曲率半径204毫米）以及5.4 m⁻¹的凹曲率（半径185毫米）。当辨别两个凸球形曲面时，受试者能够区分144 m⁻¹的曲率与158 m⁻¹的曲率（分别为6.95和6.33毫米的半径），并且能够区分287 m⁻¹的曲率与319 m⁻¹的曲率（分别为3.48和3.13毫米的半径）；韦伯分数约为0.1。估计了曲面与指腹皮肤之间的接触面积。接触面积与缩放函数之间存在近似对应关系。
