Hand preference on unimanual and bimanual tasks in Barbary macaques (<i>Macaca sylvanus</i>)

Regaiolli, Barbara; Spiezio, Caterina; Hopkins, William D.

doi:10.1002/ajp.22745

Cited by 16 publications

(27 citation statements)

References 68 publications

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“…At the group level, no bias in hand preference was found, either for the mothers nor for the infants. This finding agrees with other studies on Barbary macaques, revealing no group-level hand preference on simple food reaching tasks (Schmitt et al, 2008;Regaiolli et al, 2018). Moreover, no significant differences were found between mothers and infants in both the LI and the ABS-LI scores, suggesting that mother and infant hand preference is similar in terms of both direction and strength.…”

Section: Discussionsupporting

confidence: 92%

“…Manuscript to be reviewed sampling method was used to collect the bouts of right and left-hand use for different behavioural categories in both mothers and infants and to collect the bouts of infant nipple preference. A bout was intended as the first event of a series and we did not record more than one response if it was not separated by a behavioural event or postural change of the macaque (McGrew & Marchant, 1997;Hopkins et al, 2001;Regaiolli, Spiezio & Hopkins, 2018).…”

Section: Procedures and Data Collectionmentioning

confidence: 99%

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Peer Review #2 of "Asymmetries in mother-infant behaviour in Barbary macaques (Macaca sylvanus) (v0.1)"

2018

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Asymmetries in the maternal behaviour and anatomy might play an important role in the development of primate manual lateralization. In particular, early life asymmetries in mother's and infant's behaviour have been suggested to be associated with the development of the hand preference of the offspring. The aim of this study was to investigate the presence of behavioural asymmetries in different behavioural categories of mother-infant dyads of zoo-living Barbary macaques (Macaca sylvanus). The study subjects were 14 Barbary macaques involved in seven mother-infant dyads housed in Parco Natura Viva, Italy. For the mothers, frequencies of hand preference for maternal cradling and infant retrieval were collected. For the infants, we focused on nipple preference and hand reference for clinging on mother ventrum. Moreover, we collected frequencies of hand preference for food reaching in both groups. No significant group-level bias was found for any of the behavioural categories in either mothers or infants. However, at the individual level, six out of seven mothers showed a significant cradling bias, three toward the right hand and three toward the left hand. Moreover, all infants showed a significant nipple preference, six toward the mother's right nipple, one toward the left nipple. Furthermore, a significant correlation was found between the infant nipple preference and their hand preference for food reaching, suggesting that maternal environment rather than behaviour might affect the development of hand preference in Old World monkeys. Our findings seem partially to add to previous literature on perceptual lateralization in different species of non-primate mammals, reporting a lateral bias in mother-infant interactions. Given the incongruences between our study and previous research in great apes and humans, our results seem to suggest possible phylogenetic differences in the lateralization of mothers and infants within the Primates order.

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Section: Discussionsupporting

confidence: 92%

Section: Procedures and Data Collectionmentioning

confidence: 99%

Peer Review #2 of "Asymmetries in mother-infant behaviour in Barbary macaques (Macaca sylvanus) (v0.1)"

2018

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“…There has been, however, an incipient standardizing in tasks used to assess hand preferences in non‐human primates, particularly using bimanual coordinated tasks, that are considered a better indicator of hand and brain laterality in non‐human primates than less cognitively demanding tasks (e.g., Hopkins, ; Hopkins & Cantalupo, ; Meguerditchian, Vauclair, & Hopkins ). In recent years, the tube task (Hopkins, ) has stood out as the preferred choice for evaluating laterality in numerous studies (e.g., Fan et al, ; Morino, Uchikoshi, Bercovitch, Hopkins, & Matsuzawa, ; Regaiolli, Spiezio, & Hopkins, ; Zhao, Hopkins, & Li, ). The tube task consists of a tube of PVC, with variable dimensions depending on the studied species, that requires coordinated bimanual actions, that is, the primate holds the tube with one hand and uses a finger of the opposite hand, to retrieve a food reward from inside the tube.…”

Section: Introductionmentioning

confidence: 99%

Hand preferences and differences in extractive foraging in seven capuchin monkey species

Andrade

Sousa

2018

American J Primatol

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Tool use and extractive foraging could be drivers for right hand use preference. The robust capuchins, Sapajus, are more specialized for destructive and extractive foraging than the gracile capuchins, Cebus. Thus, we predicted them to show right-hand preference and higher rates of extractive foraging when compared to the gracile capuchins. We hypothesized that capuchins that evolved in dry habitats are predisposed to show higher rates of extractive foraging and right-hand preference. We employed the tube task (152 individuals) and an extractive foraging task (212 individuals) in seven species of capuchins in captive settings. Data on hand preference and extractive foraging were collected using focal and scan sampling, respectively. Contrary to our hypothesis, S. libidinosus showed significant left hand preference, while S. robustus and S. flavius showed a right hand preference. The species S. xanthosternos, S. flavius, and S. robustus engaged in extractive foraging significantly more often than S. apella, S. libidinosus, and Cebus albifrons. As expected, the gracile capuchins showed significant higher left-hand bias when compared to the robust capuchins. The findings from this study is the first indication of left-hand population level laterality in S. libidinosus, a species that evolved in an environment selecting for increased tool use. Although tool use has been associated with population level right handedness, or a strong trend to use the right hand, our results suggest the link between tool use and right-hand preference is simplistic, at least in Sapajus. The ultimate explanation for the differences in hand preference across species might be due to differences in use of key food resources. We suggest that capuchin monkeys from the Atlantic forest evolved under a stronger selective pressure for high reliance on bimanual feeding and extractive foraging, which requires more sequential actions and planning, than those species from the Amazonia forest and Caatinga/Cerrado dry forest.

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“…A continuous focal animal sampling method was used to collect the bouts of right and left-hand use for different behavioural categories in both mothers and infants and to collect the bouts of infant nipple preference. A bout was intended as the first event of a series and we did not record more than one response if it was not separated by a behavioural event or postural change of the macaque ( McGrew & Marchant, 1997 ; Hopkins et al, 2001 ; Regaiolli, Spiezio & Hopkins, 2018 ). Regarding the mothers, data on the hand preference for maternal cradling and infant retrieval were collected.…”

Section: Methodsmentioning

confidence: 99%

Asymmetries in mother-infant behaviour in Barbary macaques (Macaca sylvanus)

Regaiolli

Spiezio

Hopkins

2018

PeerJ

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Asymmetries in the maternal behaviour and anatomy might play an important role in the development of primate manual lateralization. In particular, early life asymmetries in mother’s and infant’s behaviour have been suggested to be associated with the development of the hand preference of the offspring. The aim of this study was to investigate the presence of behavioural asymmetries in different behavioural categories of mother-infant dyads of zoo-living Barbary macaques (Macaca sylvanus). The study subjects were 14 Barbary macaques involved in seven mother-infant dyads housed in Parco Natura Viva, Italy. For the mothers, bouts of hand preference for maternal cradling and infant retrieval were collected. For the infants, we focused on nipple preference and hand preference for clinging on mother ventrum. Moreover, we collected bouts of hand preference for food reaching in both groups. No significant group-level bias was found for any of the behavioural categories in either mothers or infants. However, at the individual level, six out of seven mothers showed a significant cradling bias, three toward the right hand and three toward the left hand. Moreover, all infants showed a significant nipple preference, six toward the mother’s right nipple, one toward the left nipple. Furthermore, a significant correlation was found between the infant nipple preference and their hand preference for food reaching, suggesting that maternal environment rather than behaviour might affect the development of hand preference in Old World monkeys. Our findings seem partially to add to previous literature on perceptual lateralization in different species of non-primate mammals, reporting a lateral bias in mother-infant interactions. Given the incongruences between our study and previous research in great apes and humans, our results seem to suggest possible phylogenetic differences in the lateralization of mothers and infants within the Primates order.

show abstract

Hand preference on unimanual and bimanual tasks in Barbary macaques (Macaca sylvanus)

Cited by 16 publications

References 68 publications

Peer Review #2 of "Asymmetries in mother-infant behaviour in Barbary macaques (Macaca sylvanus) (v0.1)"

Peer Review #2 of "Asymmetries in mother-infant behaviour in Barbary macaques (Macaca sylvanus) (v0.1)"

Hand preferences and differences in extractive foraging in seven capuchin monkey species

Asymmetries in mother-infant behaviour in Barbary macaques (Macaca sylvanus)

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