Voxel-Wise Quantitative Mapping of the Brain Association Ability

Area of Science:

• Neuroscience
• Cognitive Science
• Brain Imaging

Background:

• Association cortices integrate multimodal information for high-order cognitive functions.
• Understanding changes in associative cortices is crucial for studying brain development, aging, plasticity, and disorders.
• Quantitative methods to characterize brain association capability are currently lacking.

Purpose of the Study:

• To develop a novel voxel-level method, the association index (Asso), for quantitatively characterizing brain association ability.
• To investigate the spatial distribution patterns of Asso in the brain.
• To compare Asso mapping with existing methods like degree centrality and apply it to aging studies.

Main Methods:

• Development of a voxel-level association index (Asso).
• Application of the Asso method to neuroimaging data.
• Comparison of Asso patterns with functional connectivity strength (degree centrality).
• Investigation of aging effects using the Asso method.

Main Results:

• High Asso values were observed in association cortical networks, with low values in visual and limbic networks, indicating a functional gradient.
• Asso mapping demonstrated consistent spatial distribution patterns across different thresholds, suggesting a threshold-free characteristic.
• Asso mapping revealed distinct patterns compared to degree centrality, particularly for association and primary cortices.
• The Asso method successfully identified findings consistent with previous studies in aging research.

Conclusions:

• The developed Asso method effectively quantifies brain association patterns at the voxel level.
• Asso mapping provides a novel approach to understanding the neural basis of brain development, aging, and disorders.
• This method offers a new avenue for investigating functional abnormalities and brain plasticity.