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Brain asymmetry differences between Chinese and Caucasian populations: a surface-based morphometric comparison study.

Yunxia Lou1,2, Lu Zhao3, Shui Yu4

  • 1Research Center for Sectional and Imaging Anatomy, Shandong University Cheeloo College of Medicine, Jinan, China.

Brain Imaging and Behavior
|August 23, 2019
PubMed
Summary

Brain asymmetry research is limited in East Asians. This study found significant differences in brain structure asymmetry between Chinese and Caucasian young adults, particularly in frontal and temporal regions.

Keywords:
Brain asymmetryCortical thicknessCortical volumeMRISurface areaSurface-based morphometry

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Area of Science:

  • Neuroscience
  • Human Anatomy
  • Cognitive Science

Background:

  • Brain asymmetry is a known phenomenon in human structure, function, and behavior.
  • Most existing research on brain asymmetry focuses on Western populations, with limited data on East Asians.
  • Cultural factors like education and language may influence brain structure and function differences across racial groups.

Purpose of the Study:

  • To investigate potential differences in brain structural asymmetries between East Asian (Chinese) and Western (Caucasian) young adults.
  • To test the hypothesis that variations in brain structural asymmetries exist between these populations.

Main Methods:

  • A surface-based morphometric (SBM) analysis was employed.
  • Cortical thickness, volume, and surface area asymmetries were assessed.
  • Two well-matched groups of right-handed, young adult males (45 Chinese, 45 Caucasian) were studied.

Main Results:

  • Consistent inter-hemispheric asymmetries were observed in multiple brain regions for Chinese young adults.
  • The Chinese group exhibited greater structural asymmetry in the frontal, temporal, occipital, and insular cortices compared to Caucasians.
  • Smaller asymmetries were noted in the parietal cortex and cingulate gyrus in the Chinese group relative to Caucasians.

Conclusions:

  • Significant differences in brain structural asymmetry exist between Chinese and Caucasian young adults.
  • These findings suggest a potential neuroanatomical basis for understanding East Asian versus Caucasian distinctions in brain functional lateralization.