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Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...
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Genetic contributions to human brain morphology and intelligence.

Hilleke E Hulshoff Pol1, Hugo G Schnack, Danielle Posthuma

  • 1Department of Psychiatry, Rudolf Magnus Institute of Neuroscience, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands. h.e.hulshoff@azu.nl

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Genetic factors significantly influence brain structure, including white matter (WM) and gray matter (GM) densities. These genetic influences on specific brain regions, like the corpus callosum and frontal cortex, also share origins with human intelligence.

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Area of Science:

  • Neuroscience
  • Behavioral Genetics
  • Human Anatomy

Background:

  • Brain volume, encompassing gray matter (GM) and white matter (WM), shows significant genetic determination in adults.
  • While total brain volume correlates with general intelligence and shares genetic origins, the heritability of focal WM and its shared genetic basis with intelligence remain largely unexplored.

Purpose of the Study:

  • To investigate the genetic influence on the density of focal gray matter (GM) and white matter (WM) regions in the adult human brain.
  • To determine if focal GM and WM structures share a common genetic origin with human intelligence.

Main Methods:

  • Utilized magnetic resonance imaging (MRI) data from 54 monozygotic and 58 dizygotic twin pairs and their siblings.
  • Employed structural equation modeling and voxel-based morphometry for genetic analyses.
  • Calculated cross-trait/cross-twin correlations to assess shared genetic origins between brain structures and intelligence.

Main Results:

  • Identified significant heritability for various WM tracts, including the superior occipitofrontal fascicle, corpus callosum, optic radiation, and corticospinal tract (heritability up to 0.85).
  • Found substantial genetic influence on GM densities in regions such as the medial frontal cortex, superior frontal cortex, superior temporal cortex, occipital cortex, postcentral cortex, posterior cingulate cortex, parahippocampal cortex, and amygdala (heritability up to 0.85).
  • Demonstrated a shared genetic origin between intelligence and specific WM regions (superior occipitofrontal, callosal, left optical radiation) and GM regions (frontal, occipital, parahippocampal).

Conclusions:

  • Genetic factors play a crucial role in the variation of focal GM and WM densities in the adult brain.
  • Human intelligence shares common genetic underpinnings with specific neural networks involving both white and gray matter structures.