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Related Experiment Video

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Dissecting the Non-human Primate Brain in Stereotaxic Space
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Short-term memory, attentional control and brain size in primates.

Carel P van Schaik1,2,3, Ivo Jacobs4, Judith M Burkart3,5

  • 1Comparative Socioecology Group, Max Planck Institute for Animal Behavior, Konstanz 78467, Germany.

Royal Society Open Science
|July 30, 2024
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Primate short-term memory performance correlates with total brain size, not specific cognitive demands. This suggests domain-general abilities, not specialized adaptations, drive cognitive variation in primates.

Keywords:
cognitive adaptationsdomain-specificityencephalization quotientshort-term memory

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Area of Science:

  • Comparative psychology
  • Neuroscience
  • Evolutionary biology

Background:

  • Brain size variability in primates is often linked to socio-ecological factors.
  • Previous studies found no correlation between short-term memory and external cognitive demands in primates.

Purpose of the Study:

  • To investigate the relationship between primate short-term memory performance and brain size.
  • To determine if domain-specific brain regions or overall brain size better predict short-term memory abilities.

Main Methods:

  • Analyzed interspecific variation in short-term memory test performance across 41 primate species.
  • Examined correlations with total brain size and encephalization quotient.
  • Assessed the predictive power of specific brain region sizes on performance.

Main Results:

  • Short-term memory performance strongly correlated with total brain size, especially after removing small sample sizes.
  • Encephalization quotient did not predict performance.
  • Sizes of brain regions associated with memory did not outperform overall brain size.

Conclusions:

  • Primate short-term memory performance is linked to domain-general cognitive abilities, not domain-specific adaptations.
  • Total brain size is a better predictor of cognitive performance than previously thought.
  • Refinements to the delayed response test are suggested to better isolate short-term memory.