Hopkins William D, Wesley Michael J, Izard M Kay, Hook Michelle, Schapiro Steven J
Division of Psychobiology, Emory University, Yerkes National Primate Research Center, 954 Gatewood Road, Atlanta, GA 30322, USA.
Behav Neurosci. 2004 Jun;118(3):659-63. doi: 10.1037/0735-7044.118.3.659.
Population-level right-handedness has historically been considered a hallmark of human evolution. Even though recent studies in chimpanzees (Pan troglodytes) have demonstrated population-level right-handedness for certain behaviors, some have questioned the validity and consistency of these findings by arguing that reported laterality effects are specific to certain colonies of apes and to those chimpanzees reared by humans. The authors report evidence of population-level right-handedness in 3 separate colonies of chimpanzees. Moreover, handedness in the 3 colonies was unrelated to the proportion of subjects that were raised by humans. This is the strongest evidence to date that population-level handedness is evident in chimpanzees and is not an artifact of human rearing.
从历史角度来看,群体层面的右利手一直被视为人类进化的一个标志。尽管最近对黑猩猩(Pan troglodytes)的研究表明,某些行为存在群体层面的右利手现象,但一些人对这些发现的有效性和一致性提出了质疑,他们认为所报告的偏侧性效应特定于某些猿类群体以及由人类饲养的黑猩猩。作者报告了在3个独立的黑猩猩群体中存在群体层面右利手的证据。此外,这3个群体中的利手情况与由人类抚养的个体比例无关。这是迄今为止最有力的证据,表明群体层面的利手现象在黑猩猩中很明显,并非人类饲养的人为产物。