ABSTRACT

The golden snub-nosed monkey (Rhinopithecus roxellana) is a typical arboreal group-living Old World primate. While limb preference has been extensively studied in this species, limb preference consistency has not yet been explored. Here, based on 26 R. roxellana adults, we investigated whether individuals exhibit consistent motor biases in manual- (e.g., unimanual feeding and social grooming) and foot-related (e.g., bipedal locomotion) tasks and whether limb preference consistency is influenced by increased social interactions during social grooming. Results showed no consistency in the direction or strength of limb preference among tasks, except for lateral strength in handedness for unimanual feeding and footedness in the initiation of locomotion. Population-level foot preference was only found among right-handers. Marked lateral bias was found in unimanual feeding, indicating that it may be a sensitive behavioural measure for assessing manual preference, especially for provisioned populations. This study not only improves our understanding of the relationship between hand and foot preference in R. roxellana but also reveals potential differential hemispheric regulation of limb preference and the influence of increased social interaction on handedness consistency.

摘要

金丝猴 ( Rhinopithecus roxellana ) 是典型的树栖群居旧大陆灵长类动物。虽然在该物种中广泛研究了肢体偏好，但尚未探索肢体偏好一致性。在这里，基于 26 R. roxellana对于成年人，我们调查了个体在手动（例如，单手喂食和社交梳理）和足部相关（例如，双足运动）任务中是否表现出一致的运动偏差，以及肢体偏好一致性是否受到社交梳理期间社交互动增加的影响。结果显示，除了单手喂食时用手习惯的侧向强度和开始运动时的足部习惯外，任务中肢体偏好的方向或强度没有一致性。只在右撇子中发现了人口水平的脚偏好。在单手喂养中发现了明显的横向偏差，表明它可能是评估人工偏好的敏感行为指标，特别是对于供应人口。这项研究不仅提高了我们对手足偏好之间关系的理解R. roxellana但也揭示了肢体偏好的潜在差异半球调节和增加的社会互动对惯用手一致性的影响。