The thalamic functional gradient and its relationship to structural basis and cognitive relevance

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• The human thalamus acts as a central hub, integrating information for cognitive functions.
• Understanding thalamic functional gradients and their link to structure and behavior is crucial.

Purpose of the Study:

• To identify and characterize functional gradients within the human thalamus.
• To investigate the relationship between these functional gradients, thalamic anatomy, and cognitive behaviors.

Main Methods:

• Utilized novel diffusion embedding analysis on functional connectivity data from two independent cohorts.
• Examined associations between identified functional gradients and thalamic anatomical, morphological, and geometric properties.

Main Results:

• Identified two primary functional gradients: a lateral/medial axis linked to anatomy and gray matter volume, and an anterior/posterior axis related to cognitive functions.
• Discovered strong correlations between these gradients and spatial distance, highlighting the role of intrinsic geometry.
• Replicated findings in an independent dataset.

Conclusions:

• Macroscale functional gradients in the thalamus demonstrate coordinated structural and functional interactions.
• Hierarchical organization within the thalamus contributes to characterizing diverse behaviors.