A consistent relationship between local white matter architecture and functional specialisation in medial frontal...

Area of Science:

• Neuroimaging
• Cognitive Neuroscience
• Neuroanatomy

Background:

• Individual brain anatomy varies, making functional landmarks hard to pinpoint using surface features like sulci and gyri.
• However, brain region function is strongly influenced by its underlying white matter connections.

Purpose of the Study:

• To investigate the relationship between functional boundaries and anatomical features in the human medial frontal cortex.
• Specifically, to compare the consistency of the supplementary motor area (SMA) and pre-SMA functional boundary with white matter versus cortical anatomy.

Main Methods:

• Utilized diffusion tensor imaging (DTI), conventional magnetic resonance imaging (MRI), and functional MRI (fMRI).
• Analyzed the medial frontal cortex, focusing on the SMA and pre-SMA.

Main Results:

• The functional boundary between the SMA and pre-SMA showed higher consistency with local white matter features.
• This boundary was less consistent with the local sulcal and gyral patterns of the neocortex.

Conclusions:

• White matter architecture provides a more reliable reference for functional boundaries in the medial frontal cortex than cortical surface anatomy.
• This finding has implications for understanding individual functional brain organization and mapping.