Unlocking near-whole-brain, layer-specific functional connectivity with 3D VAPER fMRI

Area of Science:

• Neuroscience
• Brain Imaging
• Functional Connectivity

Background:

• Cortical layer investigations bridge macro and micro brain function measures.
• Previous laminar fMRI faced limitations in whole-brain network analysis due to imaging constraints.

Purpose of the Study:

• Introduce an innovative layer-specific 3D VAPER technique for high-resolution, near-whole-brain fMRI.
• Enable flexible, connectivity-based experimental designs for layer fMRI.

Main Methods:

• Developed and applied a 3D VAPER (integrated VASO and Perfusion contrast) technique at 7 Tesla.
• Acquired 0.8-mm isotropic fMRI data during resting-state and movie-watching.
• Established a layer-specific functional connectivity analysis pipeline from individual to group levels.

Main Results:

• Demonstrated high resolution (800 µm isotropic), specificity, sensitivity, and spatial accuracy.
• Revealed distinct layer-specific connectivity patterns in default mode, somatomotor, and visual networks.
• Identified layer-specific patterns at the global hubness level.

Conclusions:

• The 3D VAPER technique advances near-whole-brain layer-specific functional connectivity analysis.
• Provides novel insights into the organizational principles of brain communication across cortical layers.
• Enhances understanding of how different brain regions interact at a laminar level.