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Can we decode the language of our primate cousins?

December 19, 2023
in Science
Can we decode the language of our primate cousins?
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Can we decode the language of our primate cousins?

The UNIGE team wanted to find out whether the frontal and orbitofrontal regions of our brain activate in the same way when faced with human and simian vocalisations. Credit: Leonardo Ceravolo

A UNIGE team shows that the human brain is capable of identifying the vocalizations of certain primate species, if they are close to us and if the frequencies used are also close to our own.

Are we able to differentiate between the vocal emissions of certain primates? A team from the University of Geneva (UNIGE) asked volunteers to categorize the vocalizations of three species of great apes (Hominidae) and humans. During each exposure to these “onomatopoeia,” brain activity was measured.

Unlike previous studies, the scientists reveal that phylogenetic proximity—or kinship—is not the only factor influencing our ability to identify these sounds. Acoustic proximity—the type of frequencies emitted—is also a determining factor.

These results show how the human brain has evolved to process the vocal emissions of some of our closest cousins more efficiently. The study has been published in Cerebral Cortex Communications.

Our ability to process verbal language is not based solely on semantics, i.e., the meaning and combination of linguistic units. Other parameters come into play, such as prosody, which includes pauses, accentuation and intonation. Affective bursts—”Aaaah!” or “Oh!” for example—are also part of this, and we share these with our primate cousins. They contribute to the meaning and understanding of our vocal communications.

When such a vocal message is emitted, these sounds are processed by the frontal and orbitofrontal regions of our brain. The function of these two areas is, among other things, to integrate sensory and contextual information leading to a decision. Are they activated in the same way when we are exposed to the emotional vocalizations of our close cousins the chimpanzees, macaques and bonobos? Are we able to differentiate between them?

MRI scans with headphones on

A UNIGE team sought to find out by exposing a group of 25 volunteers to various human and simian vocalizations. “The participants were placed in an MRI scanner and were given headphones. After a short period of familiarization with the different types of vocalizations, each participant had to categorize them, i.e., identify to which species they belonged,” explains Leonardo Ceravolo, senior lecturer at the UNIGE’s Faculty of Psychology and Educational Sciences, and first author of the study.

These vocalizations were of the affiliative type, i.e., linked to a positive interaction, or of the agonistic type, i.e., linked to a threat or distress. The human vocalizations came from databases recorded by actors. The simian ones came from field recordings made as part of previous research. This study is the first of its kind to include bonobo vocalizations.

Bonobos, not so close cousins

The results show that for macaque and chimpanzee vocalizations, the frontal and orbitofrontal regions of the participants were activated in a similar way to human vocalizations. The participants were able to differentiate between them easily. On the other hand, when confronted with the “sounds” of bonobos, also close cousins of humans, the involved cerebral areas were much less activated, and categorization was at chance level.

“It was thought that kinship between species—the ‘phylogenetic distance’—was the main parameter for having the ability, or not, to recognize these different vocalizations. We thought that the closer we were genetically, the more important this ability was,” explains Didier Grandjean, full professor at the Swiss Center for Affective Sciences and at the UNIGE’s Faculty of Psychology and Educational Sciences, who led the study.

“Our results show that a second parameter comes into play: acoustic distance. The further the dynamics of the acoustic parameters, such as the frequencies used, are from those of humans, the less certain frontal regions are activated. We then lose the ability to recognize these sounds, even if they are emitted by a close cousin, in this case the bonobo.”

Bonobo calls are very high-pitched and can sound like those of certain birds. This acoustic distance in terms of frequencies, compared with human vocalizations, explains our inability to decode them, despite our close phylogenetic proximity.

“Are we capable of identifying the different emotional aspects of affiliative or agonistic vocalizations emitted by a chimpanzee, a macaque or a bonobo? And if so, how? These questions will be at the heart of our next research, which will involve analyzing not only our ability to categorize vocalizations by species but to identify their emotional content,” concludes Grandjean.

More information:
Leonardo Ceravolo et al, Frontal mechanisms underlying primate calls recognition by humans, Cerebral Cortex Communications (2023). DOI: 10.1093/texcom/tgad019

Citation:
Can we decode the language of our primate cousins? (2023, December 19)
retrieved 19 December 2023
from https://phys.org/news/2023-12-decode-language-primate-cousins.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2023-12-decode-language-primate-cousins.html

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