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Absolute brain size predicts dog breed differences in executive function

Research output: Contribution to journalArticle

Open Access Status

  • Embargoed (until 3/01/20)

Author(s)

Daniel J. Horschler, Brian Hare, Josep Call, Juliane Kaminski, Adam Miklosi, Evan L. MacLean

School/Research organisations

Abstract

Large-scale phylogenetic studies of animal cognition have revealed robust links between absolute brain volume and species differences in executive function. However, past comparative samples have been composed largely of primates, which are characterized by evolutionarily derived neural scaling rules. Therefore, it is currently unknown whether positive associations between brain volume and executive function reflect a broad-scale evolutionary phenomenon, or alternatively, a unique consequence of primate brain evolution. Domestic dogs provide a powerful opportunity for investigating this question due to their close genetic relatedness, but vast intraspecific variation. Using citizen science data on more than 7000 purebred dogs from 74 breeds, and controlling for genetic relatedness between breeds, we identify strong relationships between estimated absolute brain weight and breed differences in cognition. Specifically, larger-brained breeds performed significantly better on measures of short-term memory and self-control. However, the relationships between estimated brain weight and other cognitive measures varied widely, supporting domain-specific accounts of cognitive evolution. Our results suggest that evolutionary increases in brain size are positively associated with taxonomic differences in executive function, even in the absence of primate-like neuroanatomy. These findings also suggest that variation between dog breeds may present a powerful model for investigating correlated changes in neuroanatomy and cognition among closely related taxa.

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Details

Original languageEnglish
Pages (from-to)187-198
Number of pages12
JournalAnimal Cognition
Volume22
Issue number2
Early online date3 Jan 2019
DOIs
Publication statusPublished - Mar 2019

    Research areas

  • Cognitive evolution, Brain evolution, Brain size, Executive function, Breed differences, Citizen science

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