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How do big brains evolve?

Cristián Gutiérrez-Ibáñez1, Pavel Němec2, Martin Paré3

  • 1Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada.

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|April 18, 2025
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Summary
This summary is machine-generated.

Brain size variation in birds and mammals often reflects pallium and cerebellum size. However, neuron counts reveal the cerebellum has more neurons than the pallium in mammals, unlike some birds like parrots and corvids.

Keywords:
brain evolutioncerebellumcognitionneuron numberspallium

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Area of Science:

  • Comparative neuroanatomy
  • Evolutionary biology
  • Cognitive neuroscience

Background:

  • Brain size variation in birds and mammals is largely attributed to the pallium (neocortex) and cerebellum.
  • This suggests convergent evolution of brain structures and cognitive abilities.

Purpose of the Study:

  • To investigate the neuron distribution in the pallium and cerebellum across different species.
  • To compare the evolutionary trajectories of pallial-cerebellar coordination in relation to cognitive complexity.

Main Methods:

  • Analysis of brain mass and volume in birds and mammals.
  • Neuron counting in the pallium and cerebellum.
  • Comparative analysis across avian and mammalian clades.

Main Results:

  • In mammals, the cerebellum consistently contains more neurons than the pallium.
  • In birds, neuron distribution varies; parrots and corvids show more pallial than cerebellar neurons.
  • Species with high cognitive abilities, like parrots and corvids, exhibit a unique pallial-cerebellar neuron ratio.

Conclusions:

  • Birds and mammals may have evolved different strategies for pallial-cerebellar coordination to achieve complex cognition.
  • Neuron counts provide a different perspective on brain evolution compared to mass or volume.
  • Convergent evolution of cognition may involve distinct neural architecture pathways.