关键词: 双足叠放, 大脑偏侧性, 脚偏好, 姿势起源理论, 川金丝猴

Abstract: Foot preference is believed to be a better predictor of the cerebral lateralization for language functions than hand preference. Interest in the evolutionary origins of hemispheric specialization in humans has prompted research of limb laterality in nonhuman primates. Comparisons of arboreal and terrestrial primates are crucial for understanding the role of posture and postural instability on foot preference. This is the first study to investigate foot preference in wild Sichuan snubnosed monkey (Rhinopithecus roxellana),a rarely studied arboreal species,in a spontaneously non-locomotive posture (bipedal folding)in the Qinling Mountains of China. All subjects showed significant individual-level foot preference. The monkeys displayed a group-level right-footedness in the bipedal posture. Neither direction nor strength of foot preference was related to sex. These results in wild R. roxellana lend further support to the postural origin theory. To the best of our knowledge,we present the first evidence of footedness in a wild Old World monkey species.

Key words: Bipedal folding, Cerebral lateralization, Footedness, Postural origin theory, Sichuan snub-nosed monkey(Rhinopithecus roxellana)