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Area of Science:

  • Comparative psychology
  • Neuroscience
  • Primatology

Background:

  • Face perception is rapid and accurate in primates.
  • Specialized visual processing networks exist for faces in the human brain.
  • Face pareidolia, the illusion of perceiving faces on inanimate objects, is common in humans but its presence in other species is unknown.

Purpose of the Study:

  • To investigate the presence of face pareidolia in rhesus monkeys (Macaca mulatta).
  • To determine if face pareidolia is a uniquely human capacity or a shared primate trait.

Main Methods:

  • A visual preference task was used to assess monkey behavior.
  • Monkeys were shown photographs of objects that elicit face pareidolia in humans.
  • Eye movements were tracked to analyze fixation patterns on illusory facial features.

Main Results:

  • Monkeys demonstrated longer looking times for objects eliciting face pareidolia compared to control objects.
  • Monkey eye movements fixated illusory facial features in patterns similar to those observed when viewing actual faces.
  • The findings suggest that face pareidolia is not limited to humans.

Conclusions:

  • Rhesus monkeys exhibit face pareidolia, indicating it is not a uniquely human ability.
  • The perception of illusory faces is likely driven by a broadly tuned face-detection mechanism shared across primate species.
  • This challenges notions that face pareidolia relies on human-specific cognitive abilities like perceptual abstraction.