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

KS Slocombe, ST Townsend, Klaus Zuberbuhler

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)441-449
Number of pages9
JournalAnimal Cognition
Volume12
DOIs
Publication statusPublished - May 2009

Keywords

  • Vocalisations
  • Playback experiment
  • Chimpanzees
  • Screams
  • Social cognition
  • VOCAL RECOGNITION
  • FEMALE BABOONS
  • COMMUNICATION
  • MACAQUES
  • MONKEYS
  • RECRUITMENT
  • LISTENERS
  • RESPONSES
  • PRIMATE
  • URSINUS

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