Chan T C
Department of Psychology, Chinese University of Hong Kong, Shatin, New Territories.
Percept Psychophys. 1995 Aug;57(6):778-86. doi: 10.3758/bf03206793.
Three experiments on the effect of density and diameter on haptic perception of rod length are reported. In Experiment 1, the subjects wielded visually occluded rods of different densities. Perceived length was found to be affected by the density of the rod regardless of the actual length. In Experiment 2, three aluminum rods of different lengths with handles of four different diameters were wielded. Perceived length of the rod was found to be shorter as the diameter of the handle with which it was wielded increased. A diameter-length illusion was thereby produced. In Experiment 3, visually occluded rods of different diameters but of the same moment of inertia about the x-axis were wielded with the right hand, and tubes of different diameters were felt with the left hand. The subjects were instructed that their right hand was grasping a handle, and that the actual diameter of the rod could be felt with the left hand. Rods were perceived to be shorter if a larger diameter was felt with the left hand. The results showed that perceived length is not just a function of actual rod length, and that is not accounted for by inertia only. The results are discussed in terms of the nature of invariants and the effect of knowledge on perception.
本文报告了三项关于密度和直径对杆长触觉感知影响的实验。在实验1中，受试者操控视觉上被遮挡的、密度不同的杆。结果发现，无论杆的实际长度如何，感知到的长度都会受到杆密度的影响。在实验2中，受试者操控三根不同长度且带有四种不同直径手柄的铝杆。结果发现，随着所操控手柄直径的增加，杆的感知长度会变短。由此产生了直径-长度错觉。在实验3中，用右手操控视觉上被遮挡的、直径不同但绕x轴的转动惯量相同的杆，并用左手触摸不同直径的管子。受试者被告知右手握住的是一个手柄，左手可以感觉到杆的实际直径。如果左手感觉到的直径较大，杆就会被感知为更短。结果表明，感知到的长度不仅仅是杆实际长度的函数，而且不能仅由转动惯量来解释。本文根据不变量的性质以及知识对感知的影响对结果进行了讨论。
