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Illusory sound perception in macaque monkeys.

Christopher I Petkov1, Kevin N O'Connor, Mitchell L Sutter

  • 1Center for Neuroscience and Section of Neurobiology, Physiology and Behavior, University of California, Davis, California 95616, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 10, 2003
PubMed
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Primates may share a mechanism for auditory induction, where perceived sound continues through silent gaps filled with noise. Macaque monkeys demonstrated this perceptual completion, similar to humans.

Area of Science:

  • Auditory perception
  • Neuroscience
  • Primate cognition

Background:

  • Natural environments contain noise that can obscure important sounds.
  • Auditory induction, or amodal completion, allows perception of continuous sound despite intermittent noise.
  • This phenomenon is analogous to visual illusions like illusory contours.

Purpose of the Study:

  • To investigate auditory induction in non-human primates.
  • To determine if rhesus macaques exhibit perceptual completion of sounds with introduced silent gaps.
  • To compare primate responses to different noise conditions known to elicit or prevent auditory induction in humans.

Main Methods:

  • Two rhesus macaque monkeys were trained on a sound discrimination task.
  • Stimuli included complete sounds and sounds with silent gaps.

Related Experiment Videos

  • Two noise conditions were used: interrupting noise (coinciding with the gap) and surrounding noise (encompassing the entire sound).

    • Main Results:

    • Macaques performed better when masking noise surrounded the entire sound stimulus compared to when it interrupted only the silent gap.
    • This finding is consistent with human psychophysical data where surrounding noise causes masking, while interrupting noise elicits auditory induction.
    • Control experiments further supported these observations.

    Conclusions:

    • Primates, including rhesus macaques, may possess a shared neural mechanism for perceptually completing missing auditory information.
    • Auditory induction appears to be a conserved cognitive ability across primate species.
    • This research provides evidence for cross-species similarities in auditory processing and perceptual completion.