Brain activation patterns associated with working memory in relapsing-remitting MS

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Medical Imaging

Background:

• Multiple sclerosis (MS) is characterized by altered brain activation patterns during various tasks.
• These alterations involve decreased activation in typical functional networks and increased activation in other brain regions.

Purpose of the Study:

• To investigate if working memory brain activation patterns are affected in individuals with MS.
• To compare working memory task performance and associated brain activity between MS patients and healthy controls.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed to examine working memory circuitry activation.
• An n-back task was administered to adults with mild relapsing-remitting MS (n=10) and healthy controls (n=10).

Main Results:

• Significant group differences in brain activation were observed under both low- and high-demand working memory conditions (p < 0.001).
• MS patients exhibited reduced activation in core prefrontal and parietal working memory regions compared to controls.
• Conversely, patients showed increased activation in regions both within and outside the typical working memory network, including medial frontal, cingulate, parietal, middle temporal, and occipital areas.

Conclusions:

• Individuals with mild relapsing-remitting MS display modified brain activation patterns during working memory tasks.
• These shifts in activation occur within and extend beyond the established neural circuitry of working memory.