Identification of vocalizers by pant hoots, pant grunts and screams in a chimpanzee

Kojima, Shozo; Izumi, Akihiro; Ceugniet, Miyuki

doi:10.1007/s10329-002-0014-8

Cited by 97 publications

(71 citation statements)

References 18 publications

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“…Nonhuman primates can process audiovisual information cross-modally to match indexical cues (20) and number of vocalizers (21), to match and tally quantity across senses (22) and associate the sound of different call types with images of conspecifics and heterospecifics producing these calls (23)(24)(25). Research aimed specifically at investigating the categorization of individuals has shown that hamsters (Mesocricetus auratus) are capable of matching multiple scent cues to the same individual (26) and that certain highly enculturated chimps (Pan troglodytes) can, through intensive training, learn to associate calls from known individuals with images of those individuals (27)(28)(29). Some species have also been shown to spontaneously integrate auditory and visual identity cues from their one highly familiar human caretaker during interspecific, lab-based trials (30,31).…”

Section: Discussionmentioning

confidence: 99%

Cross-modal individual recognition in domestic horses ( Equus caballus )

Proops

McComb²,

Reby³

2009

Proc. Natl. Acad. Sci. U.S.A.

213

199

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Individual recognition is considered a complex process and, although it is believed to be widespread across animal taxa, the cognitive mechanisms underlying this ability are poorly understood. An essential feature of individual recognition in humans is that it is cross-modal, allowing the matching of current sensory cues to identity with stored information about that specific individual from other modalities. Here, we use a cross-modal expectancy violation paradigm to provide a clear and systematic demonstration of cross-modal individual recognition in a nonhuman animal: the domestic horse. Subjects watched a herd member being led past them before the individual went of view, and a call from that or a different associate was played from a loudspeaker positioned close to the point of disappearance. When horses were shown one associate and then the call of a different associate was played, they responded more quickly and looked significantly longer in the direction of the call than when the call matched the herd member just seen, an indication that the incongruent combination violated their expectations. Thus, horses appear to possess a cross-modal representation of known individuals containing unique auditory and visual/olfactory information. Our paradigm could provide a powerful way to study individual recognition across a wide range of species.animal cognition ͉ vocal communication ͉ social behavior ͉ playback experiment ͉ expectancy violation H ow animals classify conspecifics provides insights into the social structure of a species and how they perceive their social world (1). Discrimination of kin from nonkin, and of individuals within both of these categories, is proposed to be of major significance in the evolution of social behavior (2, 3). Individual recognition can be seen as the most fine-grained categorization of conspecifics, and there is considerable interest in discovering the prevalence and complexity of this ability across species. While individual recognition is generally believed to be widespread (4), there is much debate as to what constitutes sound evidence of this ability (5). To demonstrate individual recognition, a paradigm must show that (i) discrimination operates at the level of the individual rather than at a broader level, and (ii) there is a matching of current sensory cues to identity with information stored in memory about that specific individual. Numerous studies to date have provided evidence for some form of social discrimination of auditory stimuli, but how this is achieved remains unclear. It is of considerable interest to establish whether any animal is capable of cross-modal integration of cues to identity, as this would suggest that in addition to the perception and recognition of stimuli in one domain, the brain could integrate such information into some form of higher-order representation that is independent of modality.A number of species have been shown to make very finegrained discriminations between different individuals (6-8). For example, in the habituation-dishabi...

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Section: Discussionmentioning

confidence: 99%

Cross-modal individual recognition in domestic horses ( Equus caballus )

Proops

McComb²,

Reby³

2009

Proc. Natl. Acad. Sci. U.S.A.

213

199

View full text Add to dashboard Cite

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“…The relative complexity of this process explains why individual recognition has long been thought to be a uniquely human capacity, which has been reported to develop ∼4 mo of age (35). However, it has recently been demonstrated in a few other species (16)(17)(18)(19) and might be more widespread in animals (36,37). Evidence for individual recognition by rhesus macaques raises the issue of the adaptive value of this very precise type of social recognition during interactions with conspecifics.…”

Section: Discussionmentioning

confidence: 99%

“…Only a few studies have applied this approach to investigate individual recognition in species other than humans and chimpanzees (16,17) and none of them focused on rhesus monkeys. Moreover, these studies explored individual recognition of peers (18,19), but did not examine whether this capacity extended to other species.…”

mentioning

confidence: 99%

Spontaneous voice–face identity matching by rhesus monkeys for familiar conspecifics and humans

Sliwa

Duhamel

Pascalis

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

117

102

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Recognition of a particular individual occurs when we reactivate links between current perceptual inputs and the previously formed representation of that person. This recognition can be achieved by identifying, separately or simultaneously, distinct elements such as the face, silhouette, or voice as belonging to one individual. In humans, those different cues are linked into one complex conceptual representation of individual identity. Here we tested whether rhesus macaques (Macaca mulatta) also have a cognitive representation of identity by evaluating whether they exhibit cross-modal individual recognition. Further, we assessed individual recognition of familiar conspecifics and familiar humans. In a free preferential looking time paradigm, we found that, for both species, monkeys spontaneously matched the faces of known individuals to their voices. This finding demonstrates that rhesus macaques possess a cross-modal cognitive representation of individuals that extends from conspecifics to humans, revealing the adaptive potential of identity recognition for individuals of socioecological relevance.cross-species | vocal communication | nonhuman primates | picture recognition I n humans, both faces and voices convey information about identity, providing some of the many cues we use to recognize individuals we know (1). The multifaceted nature of identity code suggests that a complex cognitive representation binds semantic information with information of different sensory modalities. In rhesus monkeys, however, it has typically been assessed only via single-modality information. For instance, rhesus monkeys can discriminate between calls of two conspecifics in a playback experiment using a spontaneous habituation-discrimination paradigm (2). They are also able to discriminate faces of two conspecifics in a match-to-sample task (3) and monkey faces or human faces in visual paired comparison tasks (4-6). These observations demonstrate that monkeys can discriminate idiosyncratic characteristics ("individual A is different from B") for their own or other species. However, they do not provide evidence of individual recognition ("this is individual A, this is B"). In comparison with discrimination, individual recognition requires an additional associative level that allows retrieval of information belonging to a specific individual. In rhesus monkeys, coarse recognition processes such as of their own species, kin, gender, reproductive status, or hierarchy are well documented (2, 7-12). However, these rudimentary recognition abilities fail to account for some sophisticated behaviors that are observed in rhesus macaques' societies. In particular, rhesus macaques live in large groups and maintain elaborate social relations involving, e.g., nonkin alliances during aggressive interactions, fight interference, reciprocal support, friendly grooming, and reconciliation (13-15). Such an organization would benefit well from the finest-grain individual recognition based on a cognitive multimodal representation of identity.Individu...

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“…Subsequent playbacks showed mother macaques were sensitive to this information conveyed in their offspring's screams, responding most strongly to screams that indicated a high risk of physical harm to her infant or a threat to the matrilineal dominance hierarchy (Gouzoules et al 1984). Although there is evidence that screams carry fewer identity cues than other more tonal call types (Owren and Rendall 2003), Cheney and Seyfarth (1980) showed that vervet monkeys can make judgements about caller identity from screams; a finding replicated in rhesus macaques (Gouzoules et al 1986;Fugate et al 2008), Barbary macaques (Fischer 2004) and captive chimpanzees (Kojima et al 2003).…”

Section: Introductionmentioning

confidence: 98%

Wild chimpanzees (Pan troglodytes schweinfurthii) distinguish between different scream types: evidence from a playback study

2008

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When experiencing aggression from group members, chimpanzees commonly produce screams. These agonistic screams are graded signals and vary acoustically as a function of the severity of aggression the caller is facing. We conducted a series of field playback experiments with a community of wild chimpanzees in the Budongo Forest, Uganda, to determine whether individuals could meaningfully distinguish between screams given in different agonistic contexts. We compared six subjects' responses to screams given in response to severe and mild aggression. Subjects consistently discriminated between the two scream types. To address the possibility that the response differences were driven directly by the screams' peripheral acoustic features, rather than any attached social meaning, we also tested the subjects' responses to tantrum screams. These screams are given by individuals that experienced social frustration, but no physical threat, yet acoustically they are very similar to screams of victims of severe aggression. We found chimpanzees looked longer at severe victim screams than either mild victim screams or tantrum screams. Our results indicate that chimpanzees attend to the informational content of screams and are able to distinguish between different scream variants, which form part of a graded continuum.

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Identification of vocalizers by pant hoots, pant grunts and screams in a chimpanzee

Cited by 97 publications

References 18 publications

Cross-modal individual recognition in domestic horses ( Equus caballus )

Cross-modal individual recognition in domestic horses ( Equus caballus )

Spontaneous voice–face identity matching by rhesus monkeys for familiar conspecifics and humans

Wild chimpanzees (Pan troglodytes schweinfurthii) distinguish between different scream types: evidence from a playback study

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