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High-fidelity copying is not necessarily the key to cumulative cultural evolution: A study in monkeys and children

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    Rights statement: This is an Accepted Manuscript of an article published in Proceedings of the Royal Society B (Biological Sciences) on 5.6.2019 , available online: https://royalsocietypublishing.org/doi/10.1098/rspb.2019.0729

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Original languageEnglish
Article number20190729
JournalProceedings of the Royal Society B.
Volume286
Issue number1904
Early online date5 Jun 2019
DOIs
Publication statusPublished - 12 Jun 2019

Abstract

The unique cumulative nature of human culture has often been explained by high-fidelity copying mechanisms found only in human social learning. However, transmission chain experiments in human and non-human primates suggest that cumulative cultural evolution (CCE) might not necessarily depend on high-fidelity copying after all. In this study we test whether defining properties of CCE can emerge in a non-copying task. We performed transmission chain experiments in Guinea baboons and human children where individuals observed and produced visual patterns composed of four squares on touch screen devices. In order to be rewarded, participants had to avoid touching squares that were touched by a previous participant. In other words, they were rewarded for innovation rather than copying. Results nevertheless exhibited fundamental properties of CCE: an increase over generations in task performance and the emergence of systematic structure. However, these properties arose from different mechanisms across species: children, unlike baboons, converged in behaviour over generations by copying specific patterns in a different location, thus introducing alternative copying mechanisms into the non-copying task. In children prior biases towards specific shapes lead to convergence in behaviour across chains, while baboon chains showed signs of lineage specificity. We conclude that CCE can result from mechanisms with varying degrees of fidelity in transmission and thus that high-fidelity copying is not necessarily the key to CCE.

    Research areas

  • social learning, cumulative cultural evolution, transmission chain, comparative psychology, primate behaviour, iterated learning

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