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Altered functional adaptation to attention and working memory tasks with increasing complexity in relapsing-remitting
Michael Amann1, Lea Sybil Dössegger, Iris-Katharina Penner
1Department of Neuroradiology, University Hospital Basel, CH-4031 Switzerland. mamann@uhbs.ch
Human Brain Mapping
|November 16, 2010
Summary
Relapsing-remitting multiple sclerosis (RR-MS) patients show altered brain activity patterns in attention and working memory tasks, even before cognitive decline is clinically apparent. These functional adaptation differences in the brain may precede noticeable symptoms.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Attention, processing speed, and working memory are crucial for cognitive function.
- Subtle cognitive changes in relapsing-remitting multiple sclerosis (RR-MS) may precede clinical diagnosis.
- Functional magnetic resonance imaging (fMRI) can detect brain activity alterations.
Purpose of the Study:
- To investigate subtle neuropsychological and functional brain changes in attention and working memory in RR-MS patients.
- To compare brain activity patterns between RR-MS patients and healthy controls (HC) using fMRI.
- To identify early indicators of cognitive changes in RR-MS.
Main Methods:
- Recruited 15 RR-MS patients and 15 age-matched HC.
- Conducted comprehensive neuropsychological assessments.
- Utilized fMRI with a multistep experimental design of increasing task complexity for attention and working memory.
Main Results:
- RR-MS patients exhibited only subtle reductions in learning and memory abilities.
- Both groups activated typical attention and working memory brain regions.
- HC showed linear activation changes with task complexity, while RR-MS patients displayed saturation effects, particularly in the right parahippocampal cortex and frontal regions.
Conclusions:
- Functional adaptation patterns in the brain can be observed in RR-MS patients prior to evident cognitive decline.
- fMRI reveals distinct brain activation patterns related to task load in RR-MS compared to HC.
- These findings suggest potential for early detection of cognitive impairment in MS through neuroimaging.
