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Robust but independent sex differences in human brain function, structure, and behavior.

Siyuan Liu1, Bridget W Mahony1, Ethan T Whitman1

  • 1Section on Developmental Neurogenomics, Human Genetics Branch, National Institute of Mental Health, Bethesda, MD, USA.

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Summary

This study reveals widespread sex differences in brain activation across 85% of the cortex, largely independent of brain size. These functional neuroimaging findings provide a foundation for understanding sex differences in brain function and behavior.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Sex differences in human behavior and disease are well-documented.
  • The underlying neurobiological mechanisms remain largely unclear.
  • A lack of large, diverse functional neuroimaging studies contributes to this knowledge gap.

Purpose of the Study:

  • To investigate sex differences in human brain function using functional magnetic resonance imaging (fMRI).
  • To explore the relationship between brain activation, brain structure, and behavior across sexes.
  • To establish a foundation for future research on sex differences in the brain.

Main Methods:

  • Acquired over 700 hours of fMRI data from 978 individuals across seven cognitive tasks.
  • Collected extensive structural and behavioral measures for each participant.
  • Utilized machine learning and brain-wide association studies to analyze the data.

Main Results:

  • Widespread (85% of cortex) and reproducible sex differences in task-based brain activation were observed.
  • These differences were largely task-specific, with small to moderate effect sizes, and not aligned with brain volume.
  • Machine learning could classify sex from brain activation, volume, or behavior, with each providing orthogonal information.
  • Brain-wide association studies indicated highly conserved brain-behavior linkages between sexes, with few subtle sex-specific differences.

Conclusions:

  • Sex differences in human brain function are extensive and task-dependent.
  • Brain activation patterns, rather than overall brain volume, are key indicators of sex differences in function.
  • Brain-behavior relationships are largely similar across sexes, suggesting conserved neural mechanisms.