Hand preference for spontaneously unimanual and bimanual coordinated tasks in wild Sichuan snub-nosed monkeys: Implication for hemispheric specialization

Behavioural Brain Research
Dapeng ZhaoBaoguo Li

Abstract

Lateralized behaviour has been studied as an observable measure of cerebral functional asymmetry for many years, and interest in the evolutionary origins of lateralized behaviour in humans has prompted research into the study of manual laterality in nonhuman primates. The Sichuan snub-nosed monkey (Rhinopithecus roxellana) is a rarely studied species as far as laterality research is concerned. In this study, we investigated hand preference in spontaneously unimanual and bimanual coordinated tasks during grooming in wild R. roxellana in the Qinling Mountains of China. We chose 26 adult individuals (20 females and 6 males) for both tasks. Wild R. roxellana shows group-level left-handedness in bimanual coordinated grooming task, but not in unimanual grooming task, which is just found on the individual-level based on z-scores. Both the direction and strength of hand preference in the bimanual task are significantly stronger than that in unimanual task. Our findings present the first evidence of group-level handedness in wild monkeys although group-level handedness had been reported in wild apes [e.g. Pongo pygmaeus: Rogers LJ, Kaplan G. Hand preference and other lateral biases in rehabilitated orangutans, Pongo pygmaeus pygmaeus. A...Continue Reading

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Citations

Aug 21, 2015·Laterality·Barbara RegaiolliGiorgio Vallortigara
Mar 14, 2012·American Journal of Physical Anthropology·Dapeng ZhaoBaoguo Li
Jan 1, 2014·American Journal of Primatology·Madhur MangalamMewa Singh
Dec 10, 2013·American Journal of Physical Anthropology·Anna V SchnoellClaudia Fichtel
Apr 9, 2011·Folia primatologica; international journal of primatology·Dapeng ZhaoKunio Watanabe
Aug 15, 2017·Folia primatologica; international journal of primatology·Colin M BrandAudra Meinelt
Sep 4, 2013·American Journal of Physical Anthropology·Charlotte CanteloupHélène Meunier
Jul 4, 2017·Frontiers in Psychology·Michael C Corballis
Mar 28, 2017·Primates; Journal of Primatology·Luca MorinoTetsuro Matsuzawa

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