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Behavioral Assessment of Manual Dexterity in Non-Human Primates
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Chimpanzees (Pan troglodytes) and bonobos (Pan paniscus) quantify split solid objects.

Trix Cacchione1, Christine Hrubesch, Josep Call

  • 1Department of Psychology, Cognitive and Developmental Psychology, University of Zurich, Zurich, Switzerland. trix.cacchione@uzh.ch

Animal Cognition
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Summary
This summary is machine-generated.

Great apes can quantify split objects, but their performance depends on the object

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Area of Science:

  • Comparative cognition
  • Primate behavior
  • Object representation

Background:

  • Previous studies indicated gorillas and orangutans process object quantities despite cohesion violations.
  • Understanding how other great apes handle such violations is crucial for comparative cognitive research.

Purpose of the Study:

  • To investigate chimpanzees' and bonobos' ability to quantify objects after cohesion violations.
  • To compare these abilities across four non-human great ape species (chimpanzees, bonobos, gorillas, orangutans).

Main Methods:

  • Action tasks involving object fission events were administered to chimpanzees and bonobos.
  • The tasks were modeled after previous infant studies on gorillas and orangutans.

Main Results:

  • All four great ape species could quantify split objects, but performance varied with the degree of non-cohesiveness.
  • Spatial ambiguity and shape invariance significantly impacted object representation and quantification.
  • Gorillas performed lower than other species, and younger apes (under 6 years) were outperformed by older individuals.

Conclusions:

  • Great apes can quantify objects even when their cohesion is violated.
  • Object splitting impacts quantity representation, with spatial and shape factors being critical.
  • Species and age influence performance in these cognitive tasks.