Immigrant chimps adapt to the local language.

By Seriously Science | February 9, 2015 9:15 am
Photo: flickr/tambako

Photo: flickr/tambako

Language is one of the most obvious features that distinguishes humans from their closest relatives, chimpanzees. Although chimps do make sounds that refer to specific objects (e.g., a certain grunt for “apple”), it was generally thought that these sounds, once learned, don’t change depending on the context. Enter these scientists, who moved a group of chimps from the Netherlands to the Edinburgh Zoo in Scotland to see what happened. Turns out that the Dutch chimps soon adopted the Scottish chimps’ sounds, which differed in their acoustic structure. Not only that, but the change only occurred after the immigrant chimps formed social bonds with their Scottish hosts, suggesting the Dutch chimps were learning the Scottish chimp language. Honestly, this sounds to me like the basis of a pretty awesome reality TV show…

Vocal Learning in the Functionally Referential Food Grunts of Chimpanzees

“One standout feature of human language is our ability to reference external objects and events with socially learned symbols, or words. Exploring the phylogenetic origins of this capacity is therefore key to a comprehensive understanding of the evolution of language. While non-human primates can produce vocalizations that refer to external objects in the environment, it is generally accepted that their acoustic structure is fixed and a product of arousal states [1]. Indeed, it has been argued that the apparent lack of flexible control over the structure of referential vocalizations represents a key discontinuity with language [2]. Here, we demonstrate vocal learning in the acoustic structure of referential food grunts in captive chimpanzees. We found that, following the integration of two groups of adult chimpanzees, the acoustic structure of referential food grunts produced for a specific food converged over 3 years. Acoustic convergence arose independently of preference for the food, and social network analyses indicated this only occurred after strong affiliative relationships were established between the original subgroups. We argue that these data represent the first evidence of non-human animals actively modifying and socially learning the structure of a meaningful referential vocalization from conspecifics. Our findings indicate that primate referential call structure is not simply determined by arousal and that the socially learned nature of referential words in humans likely has ancient evolutionary origins.”

Related content:
Wild dolphins exchange names when they meet at sea.
Killer whales can learn to “speak dolphin”.
Horses use their ears to communicate with each other.

CATEGORIZED UNDER: fun with animals
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