Affiliation:
1. Department of Zoology, Faculty of Science, Charles University, CZ-12844 Prague, Czech Republic
2. Prague Zoo, CZ-17100 Prague, Czech Republic
Abstract
Significance
The evolution of brain processing capacity has traditionally been inferred from data on brain size. However, similarly sized brains of distantly related species can differ in the number and distribution of neurons, their basic computational units. Therefore, a finer-grained approach is needed to reveal the evolutionary paths to increased cognitive capacity. Using a new, comprehensive dataset, we analyzed brain cellular composition across amniotes. Compared to reptiles, mammals and birds have dramatically increased neuron numbers in the telencephalon and cerebellum, which are brain parts associated with higher cognition. Astoundingly, a phylogenetic analysis suggests that as few as four major changes in neuron–brain scaling in over 300 million years of evolution pave the way to intelligence in endothermic land vertebrates.
Publisher
Proceedings of the National Academy of Sciences
Cited by
36 articles.
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