Assertion: hippocampus's role | /r/HasProperty | impaired performance
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text: Decreased performance in a pattern separation task was shown in a cross-sectional study of 19 patients with early relapsing-remitting multiple sclerosis (within 6–18 months after a first neurological episode suggestive of the disease), compared with healthy controls matched for age, sex, and educational level; this decrease was found in the absence of impairment in information processing speed (evaluated with the Computerized Speed Cognitive Test) and visuospatial memory (evaluated with the Brief Visuospatial Memory Test).Because the dentate gyrus has an important role in pattern separation,impaired performance on a test of pattern separation