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Heritability and correlations among learning and inhibitory control traits.

Ellis J G Langley1, Gracie Adams2, Christine E Beardsworth1

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Investigating cognitive evolution in pheasants revealed moderate heritability for inhibitory control and discrimination learning. Genetic factors influence cognitive traits, but environmental influences can mask this underlying genetic structure.

Keywords:
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Area of Science:

  • Behavioral Ecology
  • Evolutionary Genetics
  • Animal Cognition

Background:

  • Understanding cognitive evolution requires examining selection and genetic (co)variance.
  • Heritability of cognitive abilities is mainly studied in domesticated species.
  • Wild populations offer insights into natural selection's impact on cognition.

Purpose of the Study:

  • To investigate the genetic variance and correlations of four cognitive abilities in pheasants (Phasianus colchicus).
  • To estimate the heritability of inhibitory control, visual and spatial discrimination, and spatial ability.
  • To explore the genetic architecture of cognition in a wild bird population.

Main Methods:

  • Utilized a pedigree of over 450 pheasants across four generations.
  • Employed animal models and microsatellite loci to estimate heritability (h²).
  • Analyzed genetic and phenotypic correlations using principal component analysis.

Main Results:

  • Moderate heritability found for discrimination learning (h²=0.17-0.23) and inhibitory control (h²=0.17-0.23).
  • Low heritability observed for spatial ability (h²=0.09).
  • Genetic correlations were positive but not statistically significant; phenotypic correlations suggested modular cognition.

Conclusions:

  • Cognitive traits in pheasants show moderate heritability, influenced by genetic and environmental factors.
  • Environmental factors can obscure the underlying genetic structure of cognitive abilities.
  • Findings contribute to understanding the evolution of cognitive traits in natural populations.