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Author Seyfarth, R.M.; Cheney, D.L.
Title What are big brains for? Type Journal Article
Year 2002 Publication Proceedings of the National Academy of Sciences of the United States of America Abbreviated Journal Proc. Natl. Acad. Sci. U.S.A.
Volume 99 Issue 7 Pages 4141-4142
Keywords Animals; Brain/*anatomy & histology; *Intelligence; Learning; Primates/*anatomy & histology/*psychology; Social Behavior
Abstract
Address Department of Psychology, University of Pennsylvania, Philadelphia, PA 19104, USA. seyfarth@psych.upenn.edu
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0027-8424 ISBN Medium (up)
Area Expedition Conference
Notes PMID:11929989 Approved no
Call Number refbase @ user @ Serial 692
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Author Fischer, J.; Cheney, D.L.; Seyfarth, R.M.
Title Development of infant baboons' responses to graded bark variants Type Journal Article
Year 2000 Publication Proceedings. Biological sciences / The Royal Society Abbreviated Journal Proc Biol Sci
Volume 267 Issue 1459 Pages 2317-2321
Keywords *Animal Communication; Animals; Behavior, Animal; Female; Male; Models, Psychological; Papio/growth & development/*physiology; *Vocalization, Animal
Abstract We studied the development of infant baboons' (Papio cynocephalus ursinus) responses to conspecific 'barks' in a free-ranging population in the Okavango Delta, Botswana. These barks grade from tonal, harmonically rich calls into calls with a more noisy, harsh structure. Typically, tonal variants are given when the signaller is at risk of losing contact with the group or a particular individual ('contact barks'), whereas harsh variants are given in response to predators ('alarm barks'). We conducted focal observations and playback experiments in which we presented variants of barks recorded from resident adult females. By six months of age, infants reliably discriminated between typical alarm and contact barks and they responded more strongly to intermediate alarm calls than to typical contact barks. Infants of six months and older also recognized their mothers by voice. The ability to discriminate between different call variants developed with increasing age. At two and a half months of age, infants failed to respond at all, whereas at four months they responded irrespective of the call type that was presented. At six months, infants showed adult-like responses by responding strongly to alarm barks but ignoring contact barks. We concluded that infants gradually learn to attach the appropriate meaning to alarm and contact barks.
Address Department of Psychology, University of Pennsylvania, 3815 Walnut Street, Philadelphia, PA 19104, USA. fischerj@eva.mpg.de
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0962-8452 ISBN Medium (up)
Area Expedition Conference
Notes PMID:11413649 Approved no
Call Number refbase @ user @ Serial 694
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Author Rendall, D.; Cheney, D.L.; Seyfarth, R.M.
Title Proximate factors mediating “contact” calls in adult female baboons (Papio cynocephalus ursinus) and their infants Type Journal Article
Year 2000 Publication Journal of comparative psychology (Washington, D.C. : 1983) Abbreviated Journal J Comp Psychol
Volume 114 Issue 1 Pages 36-46
Keywords Animals; Animals, Wild; Botswana; Female; *Maternal Behavior; Motivation; Orientation; Papio/*psychology; Social Environment; Sound Spectrography; *Vocalization, Animal
Abstract “Contact” calls are widespread in social mammals and birds, but the proximate factors that motivate call production and mediate their contact function remain poorly specified. Field study of chacma baboons (Papio cynocephalus ursinus) revealed that contact barks in adult females were motivated by separation both from the group at large and from their dependent infants. A variety of social and ecological factors affect the probability of separation from either one or both. Results of simultaneous observations and a playback experiment indicate that the contact function of calling between mothers and infants was mediated by occasional maternal retrieval rather than coordinated call exchange. Mothers recognized the contact barks of their own infants and often were strongly motivated to locate them. However, mothers did not produce contact barks in reply unless they themselves were at risk of becoming separated from the group.
Address Department of Psychology, University of Pennsylvania, USA. d.rendall@uleth.ca
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0735-7036 ISBN Medium (up)
Area Expedition Conference
Notes PMID:10739310 Approved no
Call Number refbase @ user @ Serial 695
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Author Owren, M.J.; Seyfarth, R.M.; Cheney, D.L.
Title The acoustic features of vowel-like grunt calls in chacma baboons (Papio cyncephalus ursinus): implications for production processes and functions Type Journal Article
Year 1997 Publication The Journal of the Acoustical Society of America Abbreviated Journal J Acoust Soc Am
Volume 101 Issue 5 Pt 1 Pages 2951-2963
Keywords Animals; Female; *Papio; Sound Spectrography; *Vocalization, Animal
Abstract The acoustic features of 216 baboon grunts were investigated through analysis of field-recorded calls produced by identified females in known contexts. Analyses addressed two distinct questions: whether the acoustic features of these tonal sounds could be characterized using a source-filter approach and whether the acoustic features of grunts varied by individual caller and social context. Converging evidence indicated that grunts were produced through a combination of periodic laryngeal vibration and a stable vocal tract filter. Their acoustic properties closely resembled those of prototypical human vowel sounds. In general, variation in the acoustic features of the grunts was more strongly related to caller identity than to the social contexts of calling. However, two acoustic parameters, second formant frequency and overall spectral tilt, did vary consistently depending on whether the caller was interacting with an infant or participating in a group move. Nonetheless, in accordance with the general view that identity cueing is a compelling function in animal communication, it can be concluded that much of the observed variability in grunt acoustics is likely to be related to this aspect of signaling. Further, cues related to vocal tract filtering appear particularly likely to play an important role in identifying individual calling animals.
Address Department of Psychology, Reed College, Portland, Oregon 97202, USA. michael.owren@reed.edu
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0001-4966 ISBN Medium (up)
Area Expedition Conference
Notes PMID:9165741 Approved no
Call Number refbase @ user @ Serial 698
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Author Owren, M.J.; Dieter, J.A.; Seyfarth, R.M.; Cheney, D.L.
Title Vocalizations of rhesus (Macaca mulatta) and Japanese (M. fuscata) macaques cross-fostered between species show evidence of only limited modification Type Journal Article
Year 1993 Publication Developmental psychobiology Abbreviated Journal Dev Psychobiol
Volume 26 Issue 7 Pages 389-406
Keywords Animals; Animals, Newborn; Behavior, Animal; Discrimination Learning; Environment; Female; *Macaca; *Macaca mulatta; Male; Sound Spectrography; *Vocalization, Animal
Abstract Two rhesus and two Japanese macaque infants were cross-fostered between species in order to study the effects of auditory experience on vocal development. Both the cross-fostered and normally raised control subjects were observed over the first 2 years of life and their vocalizations were tape-recorded. We classified 8053 calls by ear, placed each call in one of six acoustic categories, and calculated the rates at which different call-types were used in different social contexts. Species differences were found in the use of “coo” and “gruff” vocalizations among control subjects. Japanese macaques invariably produced coos almost exclusively. In contrast, rhesus macaques produced a mixture of coos and gruffs and showed considerable interindividual variation in the relative use of one call type or the other. Cross-fostered Japanese macaques adhered to their species-typical behavior, rarely using gruffs. Cross-fostered rhesus subjects also exhibited species-typical behavior in many contexts, but in some situations produced coos and gruffs at rates that were intermediate between those shown by normally raised animals of the two species. This outcome suggests that environmentally mediated modification of vocal behavior may have occurred, but that the resulting changes were quite limited.
Address California Regional Primate Research Center, University of California, Davis
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ISSN 0012-1630 ISBN Medium (up)
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Notes PMID:8270122 Approved no
Call Number refbase @ user @ Serial 700
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Author Seyfarth, R.M.; Cheney, D.L.
Title Meaning and mind in monkeys Type Journal Article
Year 1992 Publication Scientific American Abbreviated Journal Sci Am
Volume 267 Issue 6 Pages 122-128
Keywords Animals; Behavior, Animal; Female; *Haplorhini; Male; Speech; *Vocalization, Animal
Abstract
Address University of Pennsylvania
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0036-8733 ISBN Medium (up)
Area Expedition Conference
Notes PMID:1439710 Approved no
Call Number refbase @ user @ Serial 701
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Author Cheney, D.L.; Seyfarth, R.M.
Title The representation of social relations by monkeys Type Journal Article
Year 1990 Publication Cognition Abbreviated Journal Cognition
Volume 37 Issue 1-2 Pages 167-196
Keywords Animals; Cercopithecus aethiops/*psychology; Concept Formation; *Dominance-Subordination; Female; Macaca fascicularis/*psychology; Male; *Social Behavior; *Social Environment
Abstract Monkeys recognize the social relations that exist among others in their group. They know who associates with whom, for example, and other animals' relative dominance ranks. In addition, monkeys appear to compare types of social relations and make same/different judgments about them. In captivity, longtailed macaques (Macaca fascicularis) trained to recognize the relation between one adult female and her offspring can identify the same relation among other mother-offspring pairs, and distinguish this relation from bonds between individuals who are related in a different way. In the wild, if a vervet monkey (Cercopithecus aethiops) has seen a fight between a member of its own family and a member of Family X, this increases the likelihood that it will act aggressively toward another member of Family X. Vervets act as if they recognize some similarity between their own close associates and the close associates of others. To make such comparisons the monkeys must have some way of representing the properties of social relationships. We discuss the adaptive value of such representations, the information they contain, their structure, and their limitations.
Address Department of Anthropology, University of Pennsylvania, Philadelphia 19104
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Language English Summary Language Original Title
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Series Volume Series Issue Edition
ISSN 0010-0277 ISBN Medium (up)
Area Expedition Conference
Notes PMID:2269006 Approved no
Call Number refbase @ user @ Serial 702
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Author Seyfarth, R.M.; Cheney, D.L.
Title The acoustic features of vervet monkey grunts Type Journal Article
Year 1984 Publication The Journal of the Acoustical Society of America Abbreviated Journal J Acoust Soc Am
Volume 75 Issue 5 Pages 1623-1628
Keywords *Acoustics; Animals; Auditory Perception; Cercopithecus/*physiology; Cercopithecus aethiops/*physiology; Cues; Dominance-Subordination; Female; Male; Social Behavior; Sound Spectrography; *Vocalization, Animal
Abstract East African vervet monkeys give short (125 ms), harsh-sounding grunts to each other in a variety of social situations: when approaching a dominant or subordinate member of their group, when moving into a new area of their range, or upon seeing another group. Although all these vocalizations sound similar to humans, field playback experiments have shown that the monkeys distinguish at least four different calls. Acoustic analysis reveals that grunts have an aperiodic F0, at roughly 240 Hz. Most grunts exhibit a spectral peak close to this irregular F0. Grunts may also contain a second, rising or falling frequency peak, between 550 and 900 Hz. The location and changes in these two frequency peaks are the cues most likely to be used by vervets when distinguishing different grunt types.
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN 0001-4966 ISBN Medium (up)
Area Expedition Conference
Notes PMID:6736426 Approved no
Call Number refbase @ user @ Serial 703
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Author Walters, J.R.; Seyfarth, R.M.
Title Primate Societies Type Miscellaneous
Year 1987 Publication Abbreviated Journal
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Notes Approved no
Call Number Equine Behaviour @ team @ Serial 4858
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Author Cheney, D.L.; Seyfarth, R.M.
Title How Monkeys See the World Type Miscellaneous
Year 1990 Publication Abbreviated Journal
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Notes Approved no
Call Number Equine Behaviour @ team @ Serial 4866
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