Benedetti F
Dipartimento di Anatomia e Fisiologia Umana, Università di Torino, Italy.
J Exp Psychol Hum Percept Perform. 1991 Feb;17(1):267-77. doi: 10.1037//0096-1523.17.1.267.
Crossing 2 adjacent fingers produces a distorted perception when 2 tactile stimuli are touched to the crossed fingertips. This is because a given pair of fingers has a functional range of action within which spatial perception is correct (uncrossed fingers) and beyond which perceived location of tactile stimuli is wrong (crossed fingers). The present study tested the possibility that this range of action could be modified following a long-lasting crossing. Therefore, the functional range of action of the 2nd and 3rd fingers was tested every month in 6 volunteers who maintained the finger crossing for as long as 6 months. The results show that after a variable period of time the range of action was enlarged such that spatial perception was correct with crossed fingers as well. The perceptual organization of the human hand therefore depends on experience and is not rigidly determined on a genetic basis.
当将两个触觉刺激分别触碰交叉的指尖时，交叉相邻的两根手指会产生扭曲的感知。这是因为给定的一对手指具有一个功能作用范围，在这个范围内空间感知是正确的（手指未交叉时），而超出这个范围时，触觉刺激的感知位置就是错误的（手指交叉时）。本研究测试了经过长期交叉后这种作用范围是否可能发生改变的可能性。因此，对6名志愿者进行了长达6个月的手指交叉，每月测试他们第二和第三根手指的功能作用范围。结果表明，经过一段可变的时间后，作用范围扩大了，以至于手指交叉时空间感知也正确了。因此，人类手部的感知组织取决于经验，并非严格由基因决定。
