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Are right- and left-handedness relevant as general categories in a non-industrialized country?

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Abstract

Whether right- and left-handedness are defined as a function of individual tasks or represent general categories across tasks has been long debated. However, the literature on handedness primarily concerns industrialized societies in which manual work has been extensively automated, and the majority of individuals in those countries do not use their arms and hands intensively for highly specialized tasks on an everyday basis. Thus, the question remains whether results from those countries regarding handedness are transferable to countries where the majority of individuals are still exploiting their lateralized skills. Here, we sampled 506 individuals from 143 locations on the islands of Flores and Adonara, Indonesia, to assess their hand preference for and hand performance on several tasks in order to evaluate, in a non-industrialized country, the level of manual specialization and the relevance of right- or left-handedness as general categories. Generalized-declared handedness was consistent with task-declared handedness across 10 specific tasks and with a measure of strength and a measure of skilfulness, suggesting that general handedness is a valid concept. This hand specialization for tasks is discussed in the context of intense and daily tool use in this agricultural society.

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Acknowledgements

We are very grateful to Valérie Durand for bibliographic help and to the Program Magister Menuju Doktor untuk Sarjana Unggul (PMDSU) 2015 for providing funding to BS. This is contribution ISEM 2017-229 SUD of the Institute of Evolutionary Science of Montpellier.

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Correspondence to Michel Raymond.

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Figure S1

Starting position of the peg-moving task. A board of and English version of the peg solitaire game is used, with two sets of three pegs with different colours. Tweezers (depicted) are used to move the pegs. A first move (arrow 1) is to jump a brown peg orthogonally over an adjacent red peg into a hole two positions away. The other arrows depict the four other moves of one row. The total number of moves of a trial is thus 5 × 3. A second trial is done with the other hand, and this process is repeated three times. (JPEG 42 kb)

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Nurhayu, W., Nila, S., Raymond, M. et al. Are right- and left-handedness relevant as general categories in a non-industrialized country?. acta ethol 21, 21–28 (2018). https://doi.org/10.1007/s10211-017-0279-y

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  • DOI: https://doi.org/10.1007/s10211-017-0279-y

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