Benedetti F
Perception. 1986;15(1):83-91. doi: 10.1068/p150083.
The third and fourth fingertips of five subjects were pressed against each other so as to produce a skin displacement. A single spherical stimulus was then applied simultaneously to the two fingertips in order to test perceptual experiences with different amounts of skin displacement. The results show that the probability of detecting one stimulus when a single stimulus was applied to the skin in the resting position was 0.90. This probability decreased with increments in skin displacement. At the maximum skin displacement tested the probability of detecting one stimulus when a single stimulus was applied to the two displaced fingertip surfaces was only 0.04: this means that the single stimulus was perceived to be double with a probability of 0.96. The occurrence of this doubling, similar to Aristotle's crossed-finger illusion, shows that a diplopia-like phenomenon is present in the somesthetic system. How this 'tactile diplopia' could represent an interesting approach to the study of tactile perception is discussed.
五名受试者的第三和第四指尖相互挤压，以产生皮肤位移。然后，同时向两个指尖施加单个球形刺激，以测试不同皮肤位移量下的感知体验。结果表明，当在静止位置向皮肤施加单个刺激时，检测到一个刺激的概率为0.90。该概率随着皮肤位移的增加而降低。在测试的最大皮肤位移时，当向两个位移的指尖表面施加单个刺激时，检测到一个刺激的概率仅为0.04：这意味着单个刺激被感知为双重刺激的概率为0.96。这种双重现象的出现，类似于亚里士多德的交叉手指错觉，表明在躯体感觉系统中存在类似复视的现象。本文讨论了这种“触觉复视”如何可能成为研究触觉感知的一种有趣方法。
