Westergaard G C, Kuhn H E, Suomi S J
Am J Primatol. 1998;44(2):147-53. doi: 10.1002/(SICI)1098-2345(1998)44:2<147::AID-AJP5>3.0.CO;2-W.
This research examined the effects of task (reaching vs. tool use) and posture (quadrupedal vs. bipedal) on hand preference in tufted capuchins (Cebus apella). Regarding direction of hand preference, we found a significant main effect of posture, as the bipedal stance elicited greater use of the right hand than did the quadrupedal stance, and a significant posture x task interaction, as bipedal reaching elicited greater use of the right hand than did other postural and task conditions. Further, we found a significant main effect of task on strength of hand preference, as tool use elicited more consistent use of one hand over the other than did reaching. Our findings indicate that bipedal reaching facilitates a mild right-hand bias in intensely manipulative primates. We speculate that this moderate bias may have been pushed in the direction of nearly exclusive right-hand preference in most humans with the development of complex tool use.
本研究考察了任务（够物与工具使用）和姿势（四足与两足）对簇绒卷尾猴（僧帽猴属）手部偏好的影响。关于手部偏好的方向，我们发现姿势有显著的主效应，因为两足站立比四足站立更倾向于使用右手；还发现了姿势与任务的显著交互作用，因为两足够物比其他姿势和任务条件更倾向于使用右手。此外，我们发现任务对手部偏好强度有显著的主效应，因为使用工具比够物更倾向于持续使用某一只手。我们的研究结果表明，两足够物促进了高度熟练的灵长类动物出现轻微的右手偏好。我们推测，随着复杂工具使用的发展，这种适度的偏好可能在大多数人类中朝着几乎完全偏好右手的方向发展。
