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Related Concept Videos

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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Related Experiment Video

Updated: Jan 19, 2026

Author Spotlight: Investigating Vocal Information Representation in Small Primates and Its Alteration by Psychiatric Disorders Using Noninvasive EEG
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Systems Underlying Human and Old World Monkey Communication: One, Two, or Infinite.

Shigeru Miyagawa1,2, Esther Clarke1,3

  • 1Linguistics and Philosophy, Massachusetts Institute of Technology, Cambridge, MA, United States.

Frontiers in Psychology
|September 26, 2019
PubMed
Summary

Cotton-top tamarin monkeys learn simple AB sequences but not complex A^nB^n structures, unlike humans. This difference is linked to distinct brain areas, suggesting non-human primates lack the recursive language abilities seen in humans.

Keywords:
Chomsky hierarchycall combinationslanguage evolutionmergeprimate calls

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Area of Science:

  • Primate cognition
  • Neuroscience
  • Linguistics

Background:

  • Previous studies show cotton-top tamarin monkeys can learn simple AB grammar sequences but struggle with complex A^nB^n sequences requiring hierarchical structure.
  • Humans readily acquire both AB and A^nB^n sequences, indicating a difference in cognitive processing.
  • Neuroanatomical studies reveal distinct brain regions are recruited for processing these sequence types: frontal operculum for AB and Broca's area for A^nB^n.

Purpose of the Study:

  • To investigate the vocal repertoires of Old World Monkeys for evidence of grammatical sequence processing.
  • To determine if non-human primate vocalizations exhibit complexity beyond simple sequences.
  • To explore the potential for recursive combinatorial operations in non-human primate communication.

Main Methods:

  • Analysis of reported vocal repertoires in Old World Monkeys.
  • Comparison of observed vocal patterns with findings from artificial grammar learning studies.
  • Theoretical modeling of primate vocalization structure using a dual-compartment frame hypothesis.

Main Results:

  • Old World Monkey vocal repertoires consist of calls with a maximum of two items, consistent with simple AB sequences.
  • These two-item calls do not appear to result from recursive combinatorial operations like human Merge.
  • A dual-compartment frame model is proposed to explain the structure of these primate calls.

Conclusions:

  • Non-human primate vocalizations, specifically in Old World Monkeys, are limited to simple AB sequences.
  • The cognitive mechanisms underlying human language, such as recursion, are likely absent in these primates.
  • Primate vocal communication may rely on fixed structural frames rather than generative combinatorial rules.