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Cognitive reserve moderates decline in information processing speed in multiple sclerosis patients

Published online by Cambridge University Press:  08 July 2010

RALPH H.B. BENEDICT ,
SARAH A. MORROW ,
BIANCA WEINSTOCK GUTTMAN ,
DIANE COOKFAIR  and
DAVID J. SCHRETLEN
RALPH H.B. BENEDICT*
Affiliation:
Department of Neurology, Division of Cognitive and Behavioral Neurosciences, State University of New York at Buffalo School of Medicine and Biomedical Sciences, Buffalo, New York Jacobs Neurological Institute, Buffalo, New York
SARAH A. MORROW
Affiliation:
Department of Neurology, Division of Cognitive and Behavioral Neurosciences, State University of New York at Buffalo School of Medicine and Biomedical Sciences, Buffalo, New York Jacobs Neurological Institute, Buffalo, New York
BIANCA WEINSTOCK GUTTMAN
Affiliation:
Department of Neurology, Division of Cognitive and Behavioral Neurosciences, State University of New York at Buffalo School of Medicine and Biomedical Sciences, Buffalo, New York Jacobs Neurological Institute, Buffalo, New York
DIANE COOKFAIR
Affiliation:
Department of Neurology, Division of Cognitive and Behavioral Neurosciences, State University of New York at Buffalo School of Medicine and Biomedical Sciences, Buffalo, New York Jacobs Neurological Institute, Buffalo, New York
DAVID J. SCHRETLEN
Affiliation:
Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland
*
*Correspondence and reprint requests to: Ralph H.B. Benedict, Department of Neurology, 100 High Street (D-6), Buffalo, New York 14203. E-mail: benedict@buffalo.edu
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Abstract

Cognitive reserve is widely recognized as a moderator of cognitive decline in patients with senile dementias such as Alzheimer’s disease. The same effect may occur in multiple sclerosis (MS), an immunologic disorder affecting the central nervous system. While MS is traditionally considered an inflammatory, white matter disease, degeneration of gray matter is increasingly recognized as the primary contributor to progressive cognitive decline. Our aim was to determine if individual differences in estimated cognitive reserve protect against the progression of cognitive dysfunction in MS. Ninety-one patients assessed twice roughly 5 years apart were identified retrospectively. Cognitive testing emphasized mental processing speed. Cognitive reserve was estimated by years of education and by performance on the North American Adult Reading Test (NAART). After controlling for baseline characteristics, both years of education (p = .013) and NAART scores (p = .049) significantly improved regression models predicting cognitive decline. Symbol Digit Modalities Test (SDMT) performance showed no significant change in patients with > 14 years of education, whereas it declined significantly in patients with ≤ 14 years of education. We conclude that greater cognitive reserve as indexed by either higher premorbid intelligence or more years of education protects against the progression of cognitive dysfunction in MS. (JINS, 2010, 16, 829–835.)

Keywords

Multiple sclerosisNeuropsychologyCognitive reserveBrain
Type
Research Articles
Information
Journal of the International Neuropsychological Society , Volume 16 , Issue 5 , September 2010 , pp. 829 - 835
Copyright
Copyright © The International Neuropsychological Society 2010

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