Anti-Correlated Myelin-Sensitive MRI Levels in Humans Consistent with a Subcortical to Sensorimotor Regulatory...

Area of Science:

• Neuroimaging
• Neuroscience
• Biomedical Engineering

Background:

• Myelination synchronizes neural signaling across varying axon lengths.
• The macroscopic regulatory mechanisms of myelination remain poorly understood.
• Previous research has hinted at anti-correlations in myelination between brain regions.

Purpose of the Study:

• To confirm the anti-correlation between subcortical and sensorimotor myelination in healthy subjects.
• To investigate the hypothesis of a regulatory interaction between these myelination patterns.
• To explore potential macroscopic regulation of myelination.

Main Methods:

• Analysis of nine myelin-sensitive brain MRI image-sets across three human cohorts.
• Utilized six MRI modalities including T1wSE, T2wSE, and Magnetization Transfer Contrast (MTC).
• Optimized Regions of Interest (ROIs) for subcortical and sensorimotor areas to detect anti-correlations.

Main Results:

• Confirmed significant negative correlations between subcortical and sensorimotor myelination in healthy controls across multiple MRI modalities (p < 0.05).
• T1/T2 ratio showed a positive correlation, representing an exception to the anti-correlation.
• Findings were reproducible across independent image-sets and cohorts.

Conclusions:

• An anti-correlation between subcortical and sensorimotor myelination exists in healthy human brains.
• This anti-correlation supports a novel regulatory interaction between these brain regions.
• A proposed mechanism suggests compensatory upregulation of sensorimotor myelination to maintain function when subcortical myelination is low.