| 1 |
Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage
|
|
|
|
In: ISSN: 0962-8436 ; EISSN: 1471-2970 ; Philosophical Transactions of the Royal Society B: Biological Sciences ; https://hal.archives-ouvertes.fr/hal-03455415 ; Philosophical Transactions of the Royal Society B: Biological Sciences, Royal Society, The, 2021, Voice modulation: from origin and mechanism to social impact (Part II), 377 (1841), ⟨10.1098/rstb.2020.0455⟩ (2021)
|
|
BASE
|
|
Show details
|
|
|
| 2 |
Supplementary figures and tables from Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage ...
|
|
|
|
BASE
|
|
Show details
|
|
|
| 3 |
Supplementary figures and tables from Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage ...
|
|
|
|
BASE
|
|
Show details
|
|
|
| 4 |
Supplementary material from "Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage" ...
|
|
|
|
BASE
|
|
Show details
|
|
|
| 5 |
Supplementary material from "Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage" ...
|
|
|
|
BASE
|
|
Show details
|
|
|
| 6 |
Supplementary material from "Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage" ...
|
|
|
|
BASE
|
|
Show details
|
|
|
| 7 |
Supplementary figures and tables from Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage ...
|
|
|
|
BASE
|
|
Show details
|
|
|
| 8 |
The development of communication in alarm contexts in wild chimpanzees
|
|
|
|
In: ISSN: 0340-5443 ; EISSN: 1432-0762 ; Behavioral Ecology and Sociobiology ; https://hal.archives-ouvertes.fr/hal-02454678 ; Behavioral Ecology and Sociobiology, Springer Verlag, 2019, 73 (8), ⟨10.1007/s00265-019-2716-6⟩ (2019)
|
|
Abstract:
International audience ; Animals have evolved a range of communicative behaviours in the presence of danger. Although the mechanisms and functions of some of these behaviours have been relatively well researched, comparatively little is known about their ontogeny, including how animals learn to inform social partners about impending danger. In adult chimpanzees, behaviours in response to dangers involve several channels, particularly alarm calls and simultaneous gaze alternations with nearby recipients. Gaze alternations may allow inexperienced individuals to learn from more experienced ones by assessing their reactions to unfamiliar objects or events, but they may also provide the basis for more advanced social referencing. Here, we were interested in the development of these two common behaviours, alarm calling and gaze alternations, in wild chimpanzees (Pan troglodytes schweinfurthii) confronted with a threat. Using a cross-sectional design, we investigated those in 8 infant and 8 juveniles by experimentally exposing them to an unfamiliar but potentially dangerous object, a large, remotely controlled, moving spider model. For alarm calling, we found a positive relation with age, starting at around 28 months, although alarm calls were not consistently emitted until after 80 months. For gaze alternations, we found no age effect, with some of the youngest infants already showing the behaviour. Although its function remains unclear in infant and juvenile chimpanzees, gaze alternations emerge early in chimpanzee development. Alarm calling may require more advanced developmental stages, such as greater perceptual abilities, categorical capacities or more sophisticated social cognition, i.e. an understanding that danger is a collective experience that requires communication. Significance statement Alarm calling and other anti-predatory behaviours have been the topic of much research but their ontogenies are still poorly described and understood. Recent studies on the behaviour of wild chimpanzees in threatening contexts have suggested sophisticated social cognitive abilities in adults. How do these behaviours develop in ontogeny? We addressed this question using a field experiment with 8 infants and 8 juveniles exposed to a novel and potentially threatening object in their natural habitat. We found that gaze alternations are present in some of the youngest individuals, potentially revealing early social awareness in chimpanzees. Age did not have an effect on the presence of gaze alternation. We also found that alarm calling was more common in older
|
|
Keyword:
[SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology; [SDV.NEU.PC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Psychology and behavior
|
|
URL: https://hal.archives-ouvertes.fr/hal-02454678
https://hal.archives-ouvertes.fr/hal-02454678/document
https://doi.org/10.1007/s00265-019-2716-6
https://hal.archives-ouvertes.fr/hal-02454678/file/Dezecache2019_Article_TheDevelopmentOfCommunicationI.pdf
|
|
BASE
|
|
Hide details
|
|
|
| 9 |
The development of communication in alarm contexts in wild chimpanzees
|
|
|
|
BASE
|
|
Show details
|
|
|
| 10 |
The development of communication in alarm contexts in wild chimpanzees
|
|
|
|
BASE
|
|
Show details
|
|
|
| 11 |
Vocalizing in chimpanzees is influenced by social-cognitive processes
|
|
|
|
BASE
|
|
Show details
|
|
|
| 15 |
Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage
|
|
|
|
In: Philos Trans R Soc Lond B Biol Sci (1479)
|
|
BASE
|
|
Show details
|
|
|
|
|
