The results showed a borderline significant positive relationship for the orangutans, where the subjects who played longer also showed a higher percent occurrence of producing same OMF variant (two-tailed Spearman’s rank-order correlation tests; r s = 0.36; N total = 30; p = 0.050; Fig. 3 A).
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Towards the complexity of laugh communication in great apes: exact facial replications in laugh faces of orangutans and chimpanzees.
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