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Chimpanzee alarm call production meets key criteria for intentionality
Auteur(s)
Schel, Anne Marijke
Townsend, Simon William
Machanda, Zarin
Slocombe, Katie Elizabeth
Date de parution
2013
In
PLoS ONE
Vol.
10
No
8
De la page
e76674
A la page
e76674
Résumé
Determining the intentionality of primate communication is critical to understanding the evolution of human language. Although intentional signalling has been claimed for some great ape gestural signals, comparable evidence is currently lacking for their vocal signals. We presented wild chimpanzees with a python model and found that two of three alarm call types exhibited characteristics previously used to argue for intentionality in gestural communication. These alarm calls were: (i) socially directed and given to the arrival of friends, (ii) associated with visual monitoring of the audience and gaze alternations, and (iii) goal directed, as calling only stopped when recipients were safe from the predator. Our results demonstrate that certain vocalisations of our closest living relatives qualify as intentional signals, in a directly comparable way to many great ape gestures. We conclude that our results undermine a central argument of gestural theories of language evolution and instead support a multimodal origin of human language.
Type de publication
Resource Types::text::journal::journal article
