Aging-Related Microstructural Alterations Along the Length of the Cingulum Bundle

Area of Science:

• Neuroimaging
• Neuroscience
• Brain Aging

Background:

• The cingulum, a key part of the limbic network, is vital for emotion, attention, and memory.
• Understanding structural brain changes during aging is crucial for cognitive health.

Purpose of the Study:

• To investigate aging-related structural changes in the cingulum's three main branches.
• To identify specific white matter alterations in the cingulum due to aging.

Main Methods:

• Diffusion weighted imaging (DWI) was used on 35 young and 33 older healthy adults.
• Constrained spherical deconvolution and region-of-interest-based tractography were employed.
• Along-tract analysis examined microstructural changes in cingulum branches.

Main Results:

• Significant aging-related changes were observed in the left subgenual cingulum branch.
• These changes included decreased fractional anisotropy and axial diffusivity.
• Increased radial diffusivity was noted in the left subgenual cingulum with aging.

Conclusions:

• The left subgenual cingulum shows distinct structural vulnerability to aging.
• This study provides detailed insights into age-related white matter changes in the cingulum.
• Advanced imaging methods reveal specific microstructural alterations during brain aging.