Dimond S, Harries R
Neuropsychologia. 1984;22(2):227-33. doi: 10.1016/0028-3932(84)90065-4.
The evolution of face touching, i.e. the use of the hand to touch the individual's own face, was studied in monkeys, apes and man with the object of examining which hand is used and which part of the face is touched. Monkeys show little if any face touching. Gorillas, orang- utans and chimpanzees show face-touching comparable to man. Left-hand face touching was superior to right-hand touching for both apes and humans. One feature which distinguished humans from other apes was the frequency of chin touching, which is generally high for man. It has been suggested that emotions are expressed more intensely on the left side of the face and it was thought that the left hand is used by the right hemisphere as a special pointer to heighten the effect of this.
对面部触摸（即使用手触摸个体自身面部）的演变进行了研究，研究对象包括猴子、猿类和人类，目的是考察使用哪只手以及触摸面部的哪个部位。猴子几乎没有面部触摸行为。大猩猩、猩猩和黑猩猩表现出与人类相当的面部触摸行为。对于猿类和人类来说，左手触摸面部比右手更常见。人类与其他猿类的一个区别特征是触摸下巴的频率，人类的这一频率通常较高。有人提出，情感在面部左侧表达得更为强烈，并且认为右脑使用左手作为一种特殊的指示来增强这种效果。
