Functional connectivity of human striatum: a resting state FMRI study

Area of Science:

• Neuroscience
• Human Neuroimaging
• Brain Circuitry Analysis

Background:

• Basal ganglia are classically motor structures but involved in diverse functions.
• Basal ganglia dysfunction is linked to neurological and psychiatric disorders.
• Current models rely heavily on animal studies despite human neuroimaging advances.

Purpose of the Study:

• To conduct a comprehensive functional connectivity analysis of human basal ganglia circuitry.
• To provide in vivo evidence for functional organization in humans using resting-state fMRI.
• To identify subtler distinctions within striatal subregions.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) in humans.
• Voxelwise regression analyses to examine functional connectivity.
• Mapping distinct striatal circuits within a single study.

Main Results:

• Substantiated hypothesized motor, cognitive, and affective divisions among striatal subregions.
• Provided in vivo evidence supporting parallel and integrative loop models.
• Revealed previously unappreciated subtler distinctions within striatal subregions, including specific orbitofrontal cortex connections.

Conclusions:

• Resting-state fMRI enables mapping of multiple distinct human striatal circuits.
• Findings support established basal ganglia loop models and reveal novel details.
• This approach shows promise for studying basal ganglia dysfunction in clinical disorders.