Difference between Sudden and Gradual onset...

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" twins with sudden illness onset demonstrated slowed information

processing compared with those with gradual onset (p = .01). Sudden

onset CFS was associated with reduced speed of information processing. "

it also states:

" fatigued twins exhibited decreases in motor functions (p = .05), speed

of information processing (p = .02), verbal memory (p = .02), and

executive functioning (p = .01). "

Neuropsychology. 2007 Jul;21(4):507-13. PMID: 17605583