Kappers A M, Koenderink J J, Lichtenegger I
Utrecht Biophysics Research Institute, The Netherlands.
Percept Psychophys. 1994 Jul;56(1):53-61. doi: 10.3758/bf03211690.
In two experiments, the active haptic identification of three-dimensional mathematically well-defined objects is investigated. The objects, quadric surfaces, are defined in terms of the shape index, a quantity describing the shape, and curvedness, a quantity describing overall curvature. Both shape index and curvedness are found to have a significant influence on haptic shape identification. Concave surfaces lead to a larger spread in responses than convex ones. Hyperbolic surfaces show a slight tendency to be identified with more difficulty than elliptic ones. Surfaces with a high curvedness are identified more easily than those with a low curvedness. Results from experiments with constant and with random curvedness are indistinguishable. It is concluded that shape index and curvedness are psychophysically not confounded.
在两项实验中，对通过主动触觉识别三维数学上定义明确的物体进行了研究。这些物体为二次曲面，根据形状指数（一个描述形状的量）和曲率（一个描述整体曲率的量）来定义。研究发现，形状指数和曲率对触觉形状识别均有显著影响。凹面导致的反应差异比凸面更大。双曲面显示出比椭圆面更难被识别的轻微趋势。曲率高的表面比曲率低的表面更容易被识别。恒定曲率和随机曲率实验的结果没有区别。得出的结论是，形状指数和曲率在心理物理学上没有混淆。
