1
|
Abreu F, Pika S. Turn-taking skills in mammals: A systematic review into development and acquisition. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.987253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
How human language evolved remains one of the most intriguing questions in science, and different approaches have been used to tackle this question. A recent hypothesis, the Interaction Engine Hypothesis, postulates that language was made possible through the special capacity for social interaction involving different social cognitive skills (e.g., joint attention, common ground) and specific characteristics such as face-to-face interaction, mutual gaze and turn-taking, the exchange of rapid communicative turns. Recently, it has been argued that this turn-taking infrastructure may be a foundational and ancient mechanism of the layered system of language because communicative turn-taking has been found in human infants and across several non-human primate species. Moreover, there is some evidence for turn-taking in different mammalian taxa, especially those capable of vocal learning. Surprisingly, however, the existing studies have mainly focused on turn-taking production of adult individuals, while little is known about its emergence and development in young individuals. Hence, the aim of the current paper was 2-fold: First, we carried out a systematic review of turn-taking development and acquisition in mammals to evaluate possible research bias and existing gaps. Second, we highlight research avenues to spur more research into this domain and investigate if distinct turn-taking elements can be found in other non-human animal species. Since mammals exhibit an extended development period, including learning and strong parental care, they represent an excellent model group in which to investigate the acquisition and development of turn-taking abilities. We performed a systematic review including a wide range of terms and found 21 studies presenting findings on turn-taking abilities in infants and juveniles. Most of these studies were from the last decade, showing an increased interest in this field over the years. Overall, we found a considerable variation in the terminologies and methodological approaches used. In addition, studies investigating turn-taking abilities across different development periods and in relation to different social partners were very rare, thereby hampering direct, systematic comparisons within and across species. Nonetheless, the results of some studies suggested that specific turn-taking elements are innate, while others are acquired during development (e.g., flexibility). Finally, we pinpoint fruitful research avenues and hypotheses to move the field of turn-taking development forward and improve our understanding of the impact of turn-taking on language evolution.
Collapse
|
2
|
Bouchet H, Lemasson A, Collier K, Marker L, Schmidt-Küntzel A, Johnston B, Hausberger M. Early life experience and sex influence acoustic repertoire use in wild-born, but hand-reared, captive cheetahs (Acinonyx jubatus). Dev Psychobiol 2022; 64:e22309. [PMID: 36282750 DOI: 10.1002/dev.22309] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 05/30/2022] [Accepted: 06/03/2022] [Indexed: 01/27/2023]
Abstract
Early deprivation of adult influence is known to have long-lasting effects on social abilities, notably communication skills, as adults play a key role in guiding and regulating the behavior of youngsters, including acoustic repertoire use in species in which vocal production is not learned. Cheetahs grow up alongside their mother for 18 months, thus maternal influences on the development of social skills are likely to be crucial. Here, we investigated the impact of early maternal deprivation on vocal production and use in 12 wild-born cheetahs, rescued and subsequently hand-reared either at an early (less than 2 months) or a later stage of development. We could distinguish 16 sound types, produced mostly singly but sometimes in repeated or multitype sound sequences. The repertoire of these cheetahs did not differ fundamentally from that described in other studies on adult cheetahs, but statistical analyses revealed a concurrent effect of both early experience and sex on repertoire use. More specifically, early-reared males were characterized by a high proportion of Purr, Meow, and Stutter; early-reared females Mew, Growl, Hoot, Sneeze, and Hiss; late-reared males Meow, Mew, Growl, and Howl; and late-reared females mostly Meow. Our study demonstrates therefore the long-term effects of maternal deprivation on communication skills in a limited-vocal learner and its differential effect according to sex, in line with known social differences and potential differential maternal investment. More generally, it emphasizes the critical importance to consider the past history of the subjects (e.g., captive/wild-born, mother/hand-reared, early/late-mother-deprived, etc.) when studying social behavior, notably acoustic communication.
Collapse
Affiliation(s)
- Hélène Bouchet
- CNRS, EthoS (Ethologie animale et humaine), Univ Rennes, Normandie Univ, UMR 6552, Paimpont, France
| | - Alban Lemasson
- CNRS, EthoS (Ethologie animale et humaine), Univ Rennes, Normandie Univ, UMR 6552, Rennes, France.,Institut Universitaire de France, Paris, France
| | - Katie Collier
- CNRS, EthoS (Ethologie animale et humaine), Univ Rennes, Normandie Univ, UMR 6552, Paimpont, France
| | | | | | | | - Martine Hausberger
- CNRS, EthoS (Ethologie animale et humaine), Univ Rennes, Normandie Univ, UMR 6552, Paimpont, France
| |
Collapse
|
3
|
McLester E. Contact call acoustic structure is associated with inter-individual distances during antiphonal vocal exchanges in wild red-tailed monkeys (Cercopithecus ascanius schmidti). BEHAVIOUR 2022. [DOI: 10.1163/1568539x-bja10158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
Contact calls allow animals to maintain group cohesion when visibility is restricted. To maximise call detection, animals should produce calls that are audible to closest neighbours or respond to individuals that produce preceding calls (i.e., antiphony). Antiphonal exchanges are more likely to occur between older conspecifics that respond more reliably or close neighbours that are more likely to detect calls when groups are travelling. Because animals should produce calls that are optimised for propagation, call structure should be associated with the distance between individuals calling in antiphonal exchanges. I investigated whether acoustic structures of red-tailed monkey (Cercopithecus ascanius) contact calls (phrased grunts) reflected increased sound propagation as nearest neighbour distances increased, depending on three factors: (1) the occurrence of a preceding grunt, (2) neighbour age-sex class, and (3) group travel speed. I recorded grunts from five habituated monkey groups at Kibale National Park, Uganda. Per grunt, I measured five parameters associated with sound propagation. Grunt mean entropy and frequency related negatively to neighbour distance when the neighbour produced a preceding grunt or when there was no preceding grunt, but not when a more distant individual grunted prior. Neighbour age-sex class and group travel speed did not influence whether grunt structure was associated with neighbour distance, but monkeys produced grunts with higher mean entropy and frequency as groups travelled faster. Variation in grunt mean entropy and frequency was associated with propagation to either nearest neighbours or more distant individuals that produced preceding calls, providing quantitative evidence for antiphonal calling. By calling antiphonally, animals in cohesive groups can spread out to avoid intra-group competition while maintaining contact with other group members. Higher grunt entropy and frequency as groups travel faster may counteract more variable sound attenuation as animals move through acoustically complex (e.g., densely vegetated) environments.
Collapse
Affiliation(s)
- Edward McLester
- Department for the Ecology of Animal Societies, Max Planck Institute of Animal Behavior, Bücklestraße 5a, 78467 Konstanz, Germany
- School of Biological and Environmental Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK
| |
Collapse
|
4
|
Pougnault L, Levréro F, Leroux M, Paulet J, Bombani P, Dentressangle F, Deruti L, Mulot B, Lemasson A. Social pressure drives "conversational rules" in great apes. Biol Rev Camb Philos Soc 2021; 97:749-765. [PMID: 34873806 DOI: 10.1111/brv.12821] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 11/19/2021] [Accepted: 11/25/2021] [Indexed: 01/07/2023]
Abstract
In the last decade, two hypotheses, one on the evolution of animal vocal communication in general and the other on the origins of human language, have gained ground. The first hypothesis argues that the complexity of communication co-evolved with the complexity of sociality. Species forming larger groups with complex social networks have more elaborate vocal repertoires. The second hypothesis posits that the core of communication is represented not only by what can be expressed by an isolated caller, but also by the way that vocal interactions are structured, language being above all a social act. Primitive forms of conversational rules based on a vocal turn-taking principle are thought to exist in primates. To support and bring together these hypotheses, more comparative studies of socially diverse species at different levels of the primate phylogeny are needed. However, the majority of available studies focus on monkeys, primates that are distant from the human lineage. Great apes represent excellent candidates for such comparative studies because of their phylogenetic proximity to humans and their varied social lives. We propose that studying vocal turn-taking in apes could address several major gaps regarding the social relevance of vocal turn-taking and the evolutionary trajectory of this behaviour among anthropoids. Indeed, how the social structure of a species may influence the vocal interaction patterns observed among group members remains an open question. We gathered data from the literature as well as original unpublished data (where absent in the literature) on four great ape species: chimpanzees Pan troglodytes, bonobos Pan paniscus, western lowland gorillas Gorilla gorilla gorilla and Bornean orang-utans Pongo pygmaeus. We found no clear-cut relationship between classical social complexity metrics (e.g. number of group members, interaction rates) and vocal complexity parameters (e.g. repertoire size, call rates). Nevertheless, the nature of the society (i.e. group composition, diversity and valence of social bonds) and the type of vocal interaction patterns (isolated calling, call overlap, turn-taking-based vocal exchanges) do appear to be related. Isolated calling is the main vocal pattern found in the species with the smallest social networks (orang-utan), while the other species show vocal interactions that are structured according to temporal rules. A high proportion of overlapping vocalisations is found in the most competitive species (chimpanzee), while vocal turn-taking predominates in more tolerant bonobos and gorillas. Also, preferentially interacting individuals and call types used to interact are not randomly distributed. Vocal overlap ('chorusing') and vocal exchange ('conversing') appear as possible social strategies used to advertise/strengthen social bonds. Our analyses highlight that: (i) vocal turn-taking is also observed in non-human great apes, revealing universal rules for conversing that may be deeply rooted in the primate lineage; (ii) vocal interaction patterns match the species' social lifestyle; (iii) although limited to four species here, adopting a targeted comparative approach could help to identify the multiple and subtle factors underlying social and vocal complexity. We believe that vocal interaction patterns form the basis of a promising field of investigation that may ultimately improve our understanding of the socially driven evolution of communication.
Collapse
Affiliation(s)
- Loïc Pougnault
- Univ Rennes, Normandie Univ, CNRS, EthoS (Éthologie animale et humaine) - UMR 6552, 263 avenue du Général Leclerc, Rennes, 35042, France.,Université de Lyon/Saint-Etienne, CNRS, Equipe Neuro-Ethologie Sensorielle, ENES/CRNL, UMR5292, INSERM UMR_S 1028, 23 rue Paul Michelon, Saint-Etienne, 42023, France.,ZooParc de Beauval & Beauval Nature, Avenue du Blanc, Saint Aignan, 41110, France
| | - Florence Levréro
- Université de Lyon/Saint-Etienne, CNRS, Equipe Neuro-Ethologie Sensorielle, ENES/CRNL, UMR5292, INSERM UMR_S 1028, 23 rue Paul Michelon, Saint-Etienne, 42023, France
| | - Maël Leroux
- Department of Comparative Linguistics, University of Zürich, Thurgauerstrasse 30, Zürich-Oerlikon, 8050, Switzerland.,Budongo Conservation Field Station, Masindi, Uganda.,Center for the Interdisciplinary Study of Language Evolution (ISLE), University of Zürich, Plattenstrasse 54, Zürich, 8032, Switzerland
| | - Julien Paulet
- Univ Rennes, Normandie Univ, CNRS, EthoS (Éthologie animale et humaine) - UMR 6552, 263 avenue du Général Leclerc, Rennes, 35042, France
| | - Pablo Bombani
- NGO Mbou-Mon-Tour, Nkala, Territoire de Bolodo, Maï-Ndombe, Democratic Republic of the Congo
| | - Fabrice Dentressangle
- Université de Lyon/Saint-Etienne, CNRS, Equipe Neuro-Ethologie Sensorielle, ENES/CRNL, UMR5292, INSERM UMR_S 1028, 23 rue Paul Michelon, Saint-Etienne, 42023, France
| | - Laure Deruti
- Université de Lyon/Saint-Etienne, CNRS, Equipe Neuro-Ethologie Sensorielle, ENES/CRNL, UMR5292, INSERM UMR_S 1028, 23 rue Paul Michelon, Saint-Etienne, 42023, France
| | - Baptiste Mulot
- ZooParc de Beauval & Beauval Nature, Avenue du Blanc, Saint Aignan, 41110, France
| | - Alban Lemasson
- Univ Rennes, Normandie Univ, CNRS, EthoS (Éthologie animale et humaine) - UMR 6552, 263 avenue du Général Leclerc, Rennes, 35042, France.,Institut Universitaire de France, 1 rue Descartes, Paris, 75231, France
| |
Collapse
|
5
|
Pougnault L, Levréro F, Mulot B, Lemasson A. Breaking conversational rules matters to captive gorillas: A playback experiment. Sci Rep 2020; 10:6947. [PMID: 32332855 PMCID: PMC7181860 DOI: 10.1038/s41598-020-63923-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 04/07/2020] [Indexed: 11/09/2022] Open
Abstract
Across human cultures, conversations are regulated by temporal and social rules. The universality of conversational rules suggests possible biological bases and encourages comparisons with the communicative interactions of nonhuman animals. Unexpectedly, few studies have focused on other great apes despite evidence of proto-conversational rules in monkeys, thus preventing researchers from drawing conclusions on potential evolutionary origins of this behaviour. A previous study showed however that western lowland gorillas engage in soft call interactions that seem temporally- and socially-ruled. Indeed, interactions occurred mainly between individuals close in age who followed a preset response delay, thus preventing call overlap. Here, we experimentally investigated the presence of these rules in a captive gorilla group, using a violation-of-expectation paradigm. Head orientation responses suggest that the respect of response delay matters to subjects, but the importance of the interlocutors' age proximity appeared less clear. The intensity of the response varied with subjects' age in a context-dependent way, supporting a possible role of learning. Our findings support the growing number of studies highlighting the importance of vocal turn-taking in animals and a possible sociogenesis of this ability. The capacity to "converse" might have been a key step in the co-evolution of communication and complex sociality.
Collapse
Affiliation(s)
- Loïc Pougnault
- Univ Rennes, Normandie Univ, CNRS, EthoS (Éthologie animale et humaine) - UMR 6552, F-35000, Rennes, France. .,Université de Lyon/Saint-Etienne, CNRS, Equipe Neuro-Ethologie Sensorielle, ENES/CRNL, UMR5292, INSERM UMR_S 1028, Saint-Etienne, France. .,ZooParc de Beauval & Beauval Nature, 41110, Saint Aignan, France.
| | - Florence Levréro
- Université de Lyon/Saint-Etienne, CNRS, Equipe Neuro-Ethologie Sensorielle, ENES/CRNL, UMR5292, INSERM UMR_S 1028, Saint-Etienne, France
| | - Baptiste Mulot
- ZooParc de Beauval & Beauval Nature, 41110, Saint Aignan, France
| | - Alban Lemasson
- Univ Rennes, Normandie Univ, CNRS, EthoS (Éthologie animale et humaine) - UMR 6552, F-35000, Rennes, France
| |
Collapse
|
6
|
Prieur J, Barbu S, Blois‐Heulin C, Lemasson A. The origins of gestures and language: history, current advances and proposed theories. Biol Rev Camb Philos Soc 2019; 95:531-554. [DOI: 10.1111/brv.12576] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 11/30/2019] [Accepted: 12/03/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Jacques Prieur
- Department of Education and PsychologyComparative Developmental Psychology, Freie Universität Berlin Berlin Germany
- Univ Rennes, Normandie Univ, CNRS, EthoS (Ethologie animale et humaine) – UMR 6552 F‐35380 Paimpont France
| | - Stéphanie Barbu
- Univ Rennes, Normandie Univ, CNRS, EthoS (Ethologie animale et humaine) – UMR 6552 F‐35380 Paimpont France
| | - Catherine Blois‐Heulin
- Univ Rennes, Normandie Univ, CNRS, EthoS (Ethologie animale et humaine) – UMR 6552 F‐35380 Paimpont France
| | - Alban Lemasson
- Univ Rennes, Normandie Univ, CNRS, EthoS (Ethologie animale et humaine) – UMR 6552 F‐35380 Paimpont France
| |
Collapse
|
7
|
Ordóñez-Gómez JD, Santillan-Doherty AM, Hammerschmidt K. Acoustic variation of spider monkey (Ateles geoffroyi) contact calls is related to caller isolation and affects listeners' responses. PLoS One 2019; 14:e0213914. [PMID: 30943237 PMCID: PMC6447145 DOI: 10.1371/journal.pone.0213914] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 03/04/2019] [Indexed: 11/24/2022] Open
Abstract
Group living animals produce vocalizations denominated "contact calls" to maintain contact with out-of-sight group members. These calls have been shown to vary with caller identity and distance to potential listeners. However, it is not clear whether the acoustic variation of contact calls is related to caller social isolation (e.g., inside or outside a subgroup) and listeners' responses that can be helpful to maintain contact. Here, we addressed these questions in spider monkeys (Ateles geoffroyi), a Neotropical primate that exchanges contact calls denominated "whinnies", which show graded variation related to caller immediate behavior and distance between callers. Using 566 whinnies produced by 35 free-ranging adult spider monkeys recorded at ≤ 20 m from microphones, we first analyzed whether the acoustic variation of spontaneous whinnies (i.e., whinnies that are not responses to previous whinnies) is related to caller social isolation or whether acoustic variation is related to the likelihood of eliciting a response whinny from another individual. Secondly, we assessed whether listeners' responses (i.e., time to respond vocally, acoustic characteristics of response whinnies, orienting behaviors) were related to the acoustic variation of previous whinnies. Our study revealed that callers that were outside a subgroup produced whinnies with a lower fundamental frequency (F0), which travels longer distances, and increases the likelihood of producing a response whinny. Moreover, listeners (i.e., responders) responded faster to lower F0 whinnies. However, the acoustic variation (i.e., F0 variation) in response whinnies was better explained by the separation distance between callers, than by the acoustic variation of the previous whinny. Overall, our results suggest that whinny variation facilitates vocal contact to callers that are outside a subgroup, and that context and whinny variation affect listeners' responses.
Collapse
Affiliation(s)
| | | | - Kurt Hammerschmidt
- Cognitive Ethology Laboratory, German Primate Center, Göttingen, Germany
| |
Collapse
|
8
|
Briseno-Jaramillo M, Ramos-Fernández G, Palacios-Romo TM, Sosa-López JR, Lemasson A. Age and social affinity effects on contact call interactions in free-ranging spider monkeys. Behav Ecol Sociobiol 2018. [DOI: 10.1007/s00265-018-2615-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
9
|
Leroux M, Hetem RS, Hausberger M, Lemasson A. Cheetahs discriminate familiar and unfamiliar human voices. Sci Rep 2018; 8:15516. [PMID: 30341369 PMCID: PMC6195546 DOI: 10.1038/s41598-018-33971-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 10/09/2018] [Indexed: 11/08/2022] Open
Abstract
Domestic species can make the distinction between several human sub-groups, especially between familiar and unfamiliar persons. The Domestication hypothesis assumes that such advanced cognitive skills were driven by domestication itself. However, such capacities have been shown in wild species as well, highlighting the potential role of early experience and proximity with humans. Nevertheless, few studies have been focusing on the use of acoustic cues in wild species and more comparative studies are necessary to better understand this ability. Cheetah is a vocal, semi-social species, often hand raised when captive, making it therefore a good candidate for studying the ability to perceive differences in human voices. In this study, we used playback experiments to investigate whether cheetahs are able to distinguish between the voices of their familiar caretakers and visitors. We found that cheetahs showed a higher visual attention, changed activity more often and faster when the voice was familiar than when it was unfamiliar. This study is the first evidence that wild felids are able to discriminate human voices and could support the idea that early experience and proximity to humans are at least as important as domestication when it comes to the ability to recognize humans.
Collapse
Affiliation(s)
- Maël Leroux
- Univ Rennes, Normandie Univ, CNRS, EthoS (Éthologie animale et humaine) - UMR 6552, Paimpont, F-35380, France
| | - Robyn Shelia Hetem
- University of the Witwatersrand, School of Animal, Plant and Environmental Sciences, 1 Jan Smuts Avenue, Braamfontein, 2000, South Africa
| | - Martine Hausberger
- CNRS, Univ Rennes, Normandie Univ, EthoS (Éthologie animale et humaine) - UMR 6552, F-35380, Paimpont, France
| | - Alban Lemasson
- Univ Rennes, Normandie Univ, CNRS, EthoS (Éthologie animale et humaine) - UMR 6552, Paimpont, F-35380, France.
| |
Collapse
|
10
|
Herbst CT, Koda H, Kunieda T, Suzuki J, Garcia M, Fitch WT, Nishimura T. Japanese macaque phonatory physiology. ACTA ACUST UNITED AC 2018; 221:jeb.171801. [PMID: 29615529 DOI: 10.1242/jeb.171801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 03/26/2018] [Indexed: 11/20/2022]
Abstract
Although the call repertoire and its communicative function are relatively well explored in Japanese macaques (Macaca fuscata), little empirical data are available on the physics and the physiology of this species' vocal production mechanism. Here, a 6 year old female Japanese macaque was trained to phonate under an operant conditioning paradigm. The resulting 'coo' calls and spontaneously uttered 'growl' and 'chirp' calls were recorded with sound pressure level (SPL) calibrated microphones and electroglottography (EGG), a non-invasive method for assessing the dynamics of phonation. A total of 448 calls were recorded, complemented by ex vivo recordings on an excised Japanese macaque larynx. In this novel multidimensional investigative paradigm, in vivo and ex vivo data were matched via comparable EGG waveforms. Subsequent analysis suggests that the vocal range (range of fundamental frequency and SPL) of the macaque was comparable to that of a 7-10 year old human, with the exception of low intensity chirps, the production of which may be facilitated by the species' vocal membranes. In coo calls, redundant control of fundamental frequency in relation to SPL was also comparable to that in humans. EGG data revealed that growls, coos and chirps were produced by distinct laryngeal vibratory mechanisms. EGG further suggested changes in the degree of vocal fold adduction in vivo, resulting in spectral variation within the emitted coo calls, ranging from 'breathy' (including aerodynamic noise components) to 'non-breathy'. This is again analogous to humans, corroborating the notion that phonation in humans and non-human primates is based on universal physical and physiological principles.
Collapse
Affiliation(s)
- Christian T Herbst
- Bioacoustics Laboratory, Department of Cognitive Biology, University Vienna, Althanstrasse 14, 1090 Vienna, Austria
| | - Hiroki Koda
- Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Takumi Kunieda
- Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Juri Suzuki
- Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| | - Maxime Garcia
- Bioacoustics Laboratory, Department of Cognitive Biology, University Vienna, Althanstrasse 14, 1090 Vienna, Austria.,ENES Lab, Université Lyon/Saint-Etienne, NEURO-PSI, CNRS UMR 9197, 23 rue Paul Michelon, 42023 Saint-Etienne, France
| | - W Tecumseh Fitch
- Bioacoustics Laboratory, Department of Cognitive Biology, University Vienna, Althanstrasse 14, 1090 Vienna, Austria
| | - Takeshi Nishimura
- Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
| |
Collapse
|