Longitudinal brain volumetric changes during one year in non-elderly healthy adults: a voxel-based morphometry study

Area of Science:

• Neuroimaging and neuroscience research.
• Study of healthy brain aging in adults.

Background:

• Cross-sectional magnetic resonance imaging (MRI) studies suggest age-related gray matter volume decline in healthy young adults.
• Limitations exist in cross-sectional designs; longitudinal studies with repeated measures are scarce for tracking short-term brain changes in non-elderly adults.

Purpose of the Study:

• To investigate regional gray matter volume changes over a short period in healthy young adults using longitudinal MRI.
• To identify specific brain regions exhibiting detectable volume alterations in this demographic.

Main Methods:

• Longitudinal study tracking 52 healthy adults (aged 18-50) with repeated MRI scans over approximately 15 months.
• Voxel-based morphometry (VBM) used to compare gray matter volumes between the two time points.
• Analyses focused on predicting changes in the frontal lobe, temporal neocortex, and hippocampus.

Main Results:

• Significant relative gray matter volume reductions detected in the right orbitofrontal cortex and left hippocampus (P < 0.05, family-wise error corrected).
• Males showed bilateral orbitofrontal cortex gray matter reductions over time, but females did not.
• Subtle, regional gray matter alterations are detectable within short timeframes in healthy non-elderly adults.

Conclusions:

• Gray matter volume is dynamic even in healthy young adulthood, with detectable changes occurring over relatively short periods.
• These findings underscore the brain's ongoing structural plasticity throughout adult life.
• Identified regions (orbitofrontal cortex, hippocampus) are crucial for cognitive and emotional functions, suggesting potential implications for these processes.