Hand preference for a bimanual coordinated task in captive hatinh langurs (Trachypithecus hatinhensis) and grey-shanked douc langurs (Pygathrix cinerea)

Cubí, Martina; Llorente, Miquel

doi:10.1016/j.beproc.2021.104393

Cited by 3 publications

(2 citation statements)

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“…Overall, the above research revealed clear and strong individual preferences (e.g. Caspar et al, 2018;Cubí and Llorente, 2021) and in some cases handedness at the group or population level (e.g. Zhao et al, 2012).…”

Section: Introductionmentioning

confidence: 74%

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Hand preferences in coordinated bimanual tasks in non-human primates: a systematic review and meta-analysis

Llorente¹,

Soto²,

Martínez-Gázquez³

2022

Preprint

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The evolutionary significance of hand preferences among non-human primates and humans has been studied for decades with the aim of determining the origins of the population-level tendency. In this study, a meta-analysis was conducted to statistically integrate data on hand preferences in non-human primates performing the tube task and other bimanual tasks to determine the presence and direction of manual laterality. Significant individual-level lateralization was obtained for these bimanual tasks. In non-human primates, 81% of the animals analysed showed right or left-hand preference performing the tube task, this figure being 88% for other bimanual tasks. No asymmetry was found at the population level, unlike in humans. Additionally, no preference in direction was found in either of the tasks, although a strong manual preference was found performing the tube task and other bimanual tasks. Species was studied as a variable moderator throughout the meta-analysis. These results emphasize the importance of standardized testing methodologies across species and institutions to obtain comparable data and fill the gaps in the taxonomy.

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Section: Introductionmentioning

confidence: 74%

“…Due to this, and a lack of consensus among researchers, we recommend that both methods be used and both results reported, even if similar results may be found (e.g. Cubí and Llorente, 2021).…”

Section: Potential Moderator Variablesmentioning

confidence: 99%

Hand preferences in coordinated bimanual tasks in non-human primates: a systematic review and meta-analysis

Llorente¹,

Soto²,

Martínez-Gázquez³

2022

Preprint

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The evolution and biological correlates of hand preferences in anthropoid primates

Caspar

Pallasdies

Mader

et al. 2021

Preprint

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The evolution of human right-handedness has been intensively debated for decades. Manual lateralization patterns in non-human primates have the potential to elucidate evolutionary determinants of human handedness. However, restricted species samples and inconsistent methodologies are limiting comparative phylogenetic studies. By combining original data with published literature reports, we assembled data on hand preferences for standardized object manipulation in 1,806 individuals from 38 species of anthropoid primates, including monkeys, apes, and humans. Based on that, we employ quantitative phylogenetic methods to test prevalent hypotheses on the roles of ecology, brain size and tool use in primate handedness evolution. We confirm that human right-handedness represents an unparalleled extreme among anthropoids and found taxa displaying significant population-level handedness to be notably rare. Species-level direction of manual lateralization was largely uniform among non-human primates and neither correlated with phylogeny nor with any of the selected biological predictors. In contrast, we recovered highly variable patterns of hand preference strength, which show signatures of both ecology and phylogeny. In particular, terrestrial primates tend to display weaker hand preferences than arboreal species. These results challenge popular ideas on primate handedness evolution, especially the postural origins hypothesis. Furthermore, they point to a potential adaptive benefit of disparate lateralization strength in primates, a measure of hand preference that has often been overlooked in the past. Finally, our data show that human lateralization patterns do not align with trends found among other anthropoids, suggesting that unique selective pressures gave rise to the unusual hand preferences displayed by our species.

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The evolution and biological correlates of hand preferences in anthropoid primates

Caspar

Pallasdies

Mader

et al. 2022

eLife

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The evolution of human right-handedness has been intensively debated for decades. Manual lateralization patterns in non-human primates have the potential to elucidate evolutionary determinants of human handedness, but restricted species samples and inconsistent methodologies have so far limited comparative phylogenetic studies. By combining original data with published literature reports, we assembled data on hand preferences for standardized object manipulation in 1786 individuals from 38 species of anthropoid primates, including monkeys, apes, and humans. Based on that, we employ quantitative phylogenetic methods to test prevalent hypotheses on the roles of ecology, brain size, and tool use in primate handedness evolution. We confirm that human right-handedness represents an unparalleled extreme among anthropoids and found taxa displaying population-level handedness to be rare. Species-level direction of manual lateralization was largely uniform among non-human primates and did not strongly correlate with any of the selected biological predictors, nor with phylogeny. In contrast, we recovered highly variable patterns of hand preference strength, which show signatures of both ecology and phylogeny. In particular, terrestrial primates tend to display weaker hand preferences than arboreal species. These results challenge popular ideas on primate handedness evolution, including the postural origins hypothesis. Furthermore, they point to a potential adaptive benefit of disparate lateralization strength in primates, a measure of hand preference that has often been overlooked in the past. Finally, our data show that human lateralization patterns do not align with trends found among other anthropoids, suggesting that unique selective pressures gave rise to the unusual hand preferences of our species.

show abstract

Hand preference for a bimanual coordinated task in captive hatinh langurs (Trachypithecus hatinhensis) and grey-shanked douc langurs (Pygathrix cinerea)

Cited by 3 publications

References 75 publications

Hand preferences in coordinated bimanual tasks in non-human primates: a systematic review and meta-analysis

Hand preferences in coordinated bimanual tasks in non-human primates: a systematic review and meta-analysis

The evolution and biological correlates of hand preferences in anthropoid primates

The evolution and biological correlates of hand preferences in anthropoid primates

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