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Gaze alternation during "pointing" by squirrel monkeys (Saimiri sciureus)?

James R Anderson1, Hiroko Kuwahata, Kazuo Fujita

  • 1Department of Psychology, University of Stirling, Stirling, FK9 4LA, Scotland, UK. jra1@stir.ac.uk

Animal Cognition
|January 24, 2007
PubMed
Summary

Squirrel monkeys exhibit gaze alternation (GA), a key indicator of intentional communication, when reaching for food. Their rapid switching between partner and target suggests communicative intent, though not influenced by the partner

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Area of Science:

  • Primate communication
  • Comparative psychology
  • Primate behavior

Background:

  • Gaze alternation (GA) is a recognized indicator of intentionality in human infant pointing.
  • GA has been anecdotally observed in some ape and monkey species.
  • Understanding GA in non-human primates offers insights into the evolution of communication.

Purpose of the Study:

  • To investigate the presence and nature of gaze alternation in squirrel monkeys during a communicative task.
  • To determine if squirrel monkeys use GA to communicate with a human partner when reaching for out-of-reach food.
  • To explore whether changes in a human partner's attentional focus influence the monkeys' GA behavior.

Main Methods:

  • Three squirrel monkeys were trained to reach for out-of-reach food in the presence of a human.

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  • Behavior was recorded using video analysis while the human attended to the food, a distractor, or the ceiling.
  • Frame-by-frame analysis focused on gaze patterns, specifically gaze alternation between the human partner and the food target.

    • Main Results:

    • Squirrel monkeys demonstrated rapid and repeated gaze alternation, primarily when reaching for food.
    • This gaze alternation pattern suggests an attempt to communicate with the human partner.
    • The monkeys' gaze alternation behavior was not affected by the human partner's focus of attention.

    Conclusions:

    • Squirrel monkeys exhibit gaze alternation, indicative of communicative intent during object-directed reaching.
    • The findings suggest a rudimentary form of intentional communication in squirrel monkeys.
    • Further research is needed to fully understand the cognitive mechanisms underlying GA in primates and its evolutionary significance.