A cooperation experiment with white-handed gibbons (Hylobates lar).

Primates · 2023 · PMC10473987 · PMID 37222867

Europe PMC DOI

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a positive trendno p-value reported

Looking at the progression of the mean times until success per session over time, Elliot and Edith both developed a positive trend, meaning that both individuals became faster in solving the task correctly over time.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.