MS – Brain Reserve and Cognitive Reserve — SCE Neurology MCQ
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Correct answer: B — Brain reserve refers to the physical brain volume (neurons, synapses) available to withstand pathological damage before clinical deficits appear. Cognitive reserve refers to the brain's ability to use pre-existing cognitive strategies, neural networks, and compensatory mechanisms to maintain function despite damage — higher education, IQ, and cognitive engagement increase cognitive reserve
In MS, the concepts of brain reserve and cognitive reserve explain why patients with similar lesion loads can have very different levels of disability. Higher brain reserve (larger baseline brain volume) means more tissue can be lost before a clinical threshold is crossed. Higher cognitive reserve (developed through education, occupation, cognitive stimulation) means the brain can compensate for damage using alternative neural strategies. These concepts have practical implications: encouraging cognitive engagement, education, and intellectually stimulating activities may help maintain function despite MS-related damage. A: Well-established concepts. C: They apply across neurodegenerative and inflammatory diseases. D: They are related but distinct. E: They develop throughout life and are relevant at all ages.
Reference: Sumowski et al. Cognitive Reserve in MS; NICE NG100