Hand preference during unimanual and bimanual reaching actions in Sichuan snub-nosed monkeys (Rhinopithecus roxellana).
Hand preferences were investigated during one unimanual action (food-reaching) and one bimanual action (mount-reaching) in a semi-free-ranging group of Sichuan snub-nosed monkeys (Rhinopithecus roxellana) in Zhouzhi National Nature Reserve, Qinling Mountains of China. Nine of 14 individuals tested on the unimanual food-reaching action and all six individuals tested on the bimanual mount-reaching action exhibited a manual preference. Both significant right- and left-handed preferences were observed in the two actions. Sex did not affect either direction or strength of hand preference in the unimanual action. Hand preference for the bimanual action was stable over time, and the strength of hand preference was significantly stronger in the bimanual action than in the unimanual action.
Zhao
Da-Peng
DP
College of Life Sciences, Northwest University, Xi'an, China.
Ji
Wei-Hong
WH
Watanabe
Kunio
K
Li
Bao-Guo
BG
D000818:Animals; D016673:Colobinae / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D008297:Male; D012737:Sex Factors; D014741:Video Recording