Gender-Based Cerebral Perfusion Differences in 46,034 Functional Neuroimaging Scans

Area of Science:

• Neuroscience
• Medical Imaging
• Psychiatry

Background:

• Previous studies indicated inconsistent findings regarding gender differences in regional cerebral blood flow.
• Research on gender-based cerebral blood flow variations was limited by small sample sizes.

Purpose of the Study:

• To investigate the effect of gender on brain activity using single photon emission computed tomography (SPECT) in a large population.
• To analyze gender differences in both healthy individuals and psychiatric patients.

Main Methods:

• Analysis of 46,034 SPECT scans from 119 healthy subjects and 26,683 patients.
• Examination of 128 brain regions using the AAL Atlas, controlling for age and diagnoses.
• Statistical analysis performed using ROI Extract and SPSS, with corrections for multiple comparisons.

Main Results:

• Healthy females exhibited significant whole-brain and regional increases in cerebral blood flow compared to males.
• Clinical populations showed widespread increases in females, particularly in prefrontal and limbic regions.
• Males demonstrated specific increases in the inferior occipital lobes, inferior temporal lobes, and cerebellum.

Conclusions:

• Significant gender-based differences in brain activity were identified in both healthy and clinical populations.
• These findings are critical for interpreting functional neuroimaging data.
• Understanding these cerebral blood flow variations may illuminate gender disparities in psychiatric disorders.