Quantitative Limbic System Mapping of Main Cognitive Domains in Multiple Sclerosis

Area of Science:

• Neuroimaging
• Neurology
• Cognitive Science

Background:

• Cognitive impairment (CI) is prevalent in multiple sclerosis (MS).
• The underlying mechanisms and neuroimaging correlates of CI in MS are not fully understood.
• Limbic system (LS) gray and white matter structures are vital for cognition.

Purpose of the Study:

• To investigate the role of the limbic system in MS-related CI.
• To identify neuroimaging correlates of CI within the LS.
• To provide a detailed evaluation of LS involvement in MS-related cognitive deficits.

Main Methods:

• A comprehensive neuroimaging approach was employed.
• Included 10 non-cognitively impaired MS patients and 30 MS patients with CI.
• Assessed microstructural integrity, volumetry, and cortical thickness of LS structures for association with CI.

Main Results:

• Fornix and cingulum/cingulate cortices showed the strongest correlation with CI in MS.
• Specific LS structures correlated with various cognitive functions: uncinate fasciculi (verbal/visuospatial learning, fluency), hippocampi (visuospatial skills, fluency, executive functions, processing speed), thalami (verbal learning, visuospatial skills, fluency), and amygdala (verbal recognition).

Conclusions:

• A comprehensive neuroimaging approach elucidated the role of main limbic structures in MS-related CI.
• Findings highlight specific limbic system components as key correlates of cognitive dysfunction in MS.