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Voice discrimination in four primates.

Agnès Candiotti1, Klaus Zuberbühler, Alban Lemasson

  • 1Université de Rennes 1, Laboratoire EthoS "Ethologie animale et humaine", U.M.R. 6552 - C.N.R.S., Station Biologique, Paimpont, France; Centre Suisse de Recherches Scientifiques, Taï Monkey Project, Abidjan, Cote d'Ivoire; University of St Andrews, School of Psychology, St Andrews, Scotland, UK.

Behavioural Processes
|June 27, 2013
PubMed
Summary
This summary is machine-generated.

Primates can distinguish between familiar and unfamiliar vocalizations from other species within their social groups. This ability extends beyond recognizing calls from their own species, highlighting complex interspecies auditory perception.

Keywords:
Auditory discriminationMixed-species groupPlayback experimentPrimates

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Area of Science:

  • Primate communication
  • Interspecies auditory perception
  • Behavioral ecology

Background:

  • Vocalizations typically convey information about a signaller's identity and state to conspecifics.
  • African forest monkeys form stable mixed-species groups, involving frequent physical and vocal interactions.
  • The ability of primates to discriminate vocalizations of heterospecific group members remains largely unexplored.

Purpose of the Study:

  • To investigate whether primates can discriminate between familiar and unfamiliar vocalizations from heterospecifics.
  • To test auditory discrimination abilities in red-capped mangabeys, Campbell's monkeys, and Guereza colobus monkeys.

Main Methods:

  • Playback experiments using contact calls of De Brazza monkeys (heterospecifics).
  • Subjects included red-capped mangabeys, Campbell's monkeys, Guereza colobus monkeys, and De Brazza monkeys.
  • Monitored subject responses, specifically gaze duration and direction, towards auditory stimuli.

Main Results:

  • Across all tested species, subjects showed increased visual attention towards the speaker when hearing unfamiliar heterospecific calls compared to familiar ones.
  • De Brazza monkeys exhibited longer gaze durations when hearing unfamiliar calls from their own species.
  • These findings indicate a capacity for discriminating familiar from unfamiliar heterospecific vocalizations.

Conclusions:

  • Primates possess the ability to differentiate between familiar and unfamiliar voices of heterospecifics within their social environment.
  • This auditory discrimination extends beyond conspecific recognition, suggesting sophisticated interspecies communication processing.
  • The findings have implications for understanding social dynamics and information transfer in mixed-species primate groups.