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Related Experiment Video

Updated: May 28, 2026

Electroencephalography Measurements in Awake Marmosets Listening to Conspecific Vocalizations
07:52

Electroencephalography Measurements in Awake Marmosets Listening to Conspecific Vocalizations

Published on: July 26, 2024

Monkeys and humans share a common computation for face/voice integration.

Chandramouli Chandrasekaran1, Luis Lemus, Andrea Trubanova

  • 1Neuroscience Institute, Princeton University, Princeton, NJ, USA.

Plos Computational Biology
|October 15, 2011
PubMed
Summary

Monkeys, like humans, use both faces and voices to better understand vocalizations in noisy settings. This multisensory integration suggests a shared evolutionary mechanism for communication across primates.

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Published on: August 9, 2024

Area of Science:

  • Primate communication
  • Auditory-visual speech perception
  • Evolution of vocal communication

Background:

  • Face-to-face speech is a multisensory phenomenon, with visual cues from facial movements enhancing auditory speech intelligibility.
  • Vocal production biomechanics are shared between humans and Old World monkeys, suggesting potential parallels in communication evolution.
  • It remains unclear if monkeys integrate visual and auditory information from vocalizations.

Purpose of the Study:

  • To investigate whether Old World monkeys combine facial and vocal cues to improve vocalization perception.
  • To explore common computational mechanisms underlying multisensory integration in primate communication.
  • To compare the multisensory integration strategies of monkeys with those of humans.

Main Methods:

  • Monkeys were tested on a vocalization detection task in noisy environments.
  • Human participants performed an identical task to allow for cross-species comparison.
  • Computational models, including the principle of inverse effectiveness, a race model, and a superposition model, were used to explain observed behaviors.

Main Results:

  • Monkeys demonstrated enhanced detection of vocalizations when presented with both visual (facial) and auditory information, particularly in noisy conditions.
  • The behavioral patterns observed in monkeys closely paralleled those of humans performing the same task.
  • Neither the principle of inverse effectiveness nor the race model adequately explained the data; however, a superposition model provided a strong fit.

Conclusions:

  • Old World monkeys integrate facial and vocal cues for enhanced vocalization perception, mirroring human abilities.
  • A superposition model, positing linear summation of sensory inputs, effectively explains this multisensory integration across primate species.
  • This suggests a potentially homologous computational mechanism for integrating faces and voices throughout primate evolution.