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Brain structure mediates the association between height and cognitive ability.

Eero Vuoksimaa1, Matthew S Panizzon2,3, Carol E Franz2,3

  • 1Institute for Molecular Medicine Finland, University of Helsinki, P.O. Box 20 (Tukholmankatu 8), 00014, University of Helsinki, Helsinki, Finland. eero.vuoksimaa@helsinki.fi.

Brain Structure & Function
|May 12, 2018
PubMed
Summary
This summary is machine-generated.

Height and cognitive ability are linked through brain size. Specifically, total brain volume and cortical surface area mediate this association, suggesting genetics play a key role in the height-cognition relationship.

Keywords:
Cognitive abilityCortical surface areaCortical thicknessHeightMagnetic resonance imagingTwins

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Area of Science:

  • Neuroscience
  • Human Genetics
  • Cognitive Science

Background:

  • A positive association exists between human height and general cognitive ability.
  • The neural mechanisms underlying this height-cognition relationship remain largely unknown.
  • Brain size is independently associated with both height and cognitive ability.

Purpose of the Study:

  • To investigate if cortical size mediates the relationship between height and general cognitive ability.
  • To examine the roles of total cortical volume, cortical surface area, and mean cortical thickness in this association.
  • To explore the genetic underpinnings of the height-cognition link via brain structure.

Main Methods:

  • Utilized structural magnetic resonance imaging (MRI) data from 515 middle-aged male twins.
  • Measured height, general cognitive ability, total cortical volume, total cortical surface area, and mean cortical thickness.
  • Employed mediation analyses to assess the role of cortical metrics in the height-cognition association.

Main Results:

  • Height positively correlated with general cognitive ability, total cortical volume, and cortical surface area.
  • No significant association was found between height and mean cortical thickness.
  • Mediation models confirmed that total cortical volume and cortical surface area account for the height-general cognitive ability association.

Conclusions:

  • Individual differences in total cortical volume and cortical surface area mediate the phenotypic association between height and general cognitive ability.
  • The genetic correlation between cortical surface area and cognitive ability underlies the observed height-cognition relationship.
  • These findings highlight the role of global brain size metrics, particularly cortical surface area, in the complex interplay between physical stature and cognitive function.