Relative brain size and its relation with the associative pallium in birds
Sayol i Altarriba, Ferran (Centre de Recerca Ecològica i Aplicacions Forestals)
Lefebvre, Louis (Centre de Recerca Ecològica i Aplicacions Forestals)
Sol, Daniel (Centre de Recerca Ecològica i Aplicacions Forestals)

Date: 2016
Abstract: Despite growing interest in the evolution of enlarged brains, the biological significance of brain size variation remains controversial. Much of the controversy is over the extent to which brain structures have evolved independently of each other (mosaic evolution) or in a coordinated way (concerted evolution). If larger brains have evolved by the increase of different brain regions in different species, it follows that comparisons of the whole brain might be biologically meaningless. Such an argument has been used to criticize comparative attempts to explain the existing variation in whole-brain size among species. Here, we show that pallium areas associated with domain-general cognition represent a large fraction of the entire brain, are disproportionally larger in large-brained birds and accurately predict variation in the whole brain when allometric effects are appropriately accounted for. While this does not question the importance of mosaic evolution, it suggests that examining specialized, small areas of the brain is not very helpful for understanding why some birds have evolved such large brains. Instead, the size of the whole brain reflects consistent variation in associative pallium areas and hence is functionally meaningful for comparative analyses.
Note: Número d'acord de subvenció MINECO/CGL2013-47448-P
Rights: Tots els drets reservats
Language: Anglès
Document: article ; recerca ; acceptedVersion
Subject: Mosaic evolution ; Concerted evolution ; Brain size ; Cognition ; Pallium ; Encephalization
Published in: Brain, behavior and evolution, Vol. 87, issue 2, (June 2016) , p. 69-77, ISSN 0006-8977



Post-print
27 p, 1.5 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles

 Record created 2016-09-02, last modified 2020-08-15



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