Morphometrical Brain Markers of Sex Difference

Area of Science:

• Neuroscience
• Developmental Psychology
• Brain Imaging

Background:

• Neuropsychiatric disorders exhibit sex-based differences in prevalence, onset, and symptoms.
• Adolescence is a critical period for brain development and the emergence of these pathologies.
• Understanding sex-based brain differences is crucial for elucidating the neural mechanisms behind these conditions.

Purpose of the Study:

• To investigate sex-based differences in brain structure during adolescence.
• To identify specific brain regions and morphometric features that distinguish male and female adolescent brains.
• To explore the potential of these differences as neural markers for sex-based variations in neuropsychiatric conditions.

Main Methods:

• Utilized structural brain imaging data from a large cohort (n=8325) of adolescents (9-10 years old) from the Adolescent Brain Cognitive Development study.
• Employed a linear Support-Vector Machine Classifier to predict biological sex based on brain morphometry and image intensity.
• Analyzed regional brain features, including the insula, precentral and postcentral gyri, and pericallosal sulcus.

Main Results:

• The Support-Vector Machine Classifier achieved 86% accuracy in predicting sex.
• The insula, precentral gyrus, postcentral gyrus, and pericallosal sulcus were identified as the most discriminative brain regions for sex classification.
• Demonstrated robust and measurable morphometrical differences in adolescent brain structure between males and females.

Conclusions:

• Significant and measurable sex-based differences exist in adolescent brain structure.
• Specific brain regions exhibit robust morphometrical markers of sex.
• These findings provide a foundation for understanding the neural underpinnings of sex-dimorphic neuropsychiatric conditions.