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From the Portland Veterans Affairs Medical Center (Drs Howieson and Kaye and Ms. Holm) and the Department of Neurology, Oregon Health Sciences University (Drs. D.B. Howieson, Kaye, Oken, and J. Howieson), Portland, OR.
We examined cognition on a wide range of standardized neuropsychological tests in two groups of optimally healthy, elderly volunteers. One was composed of community-dwelling, functionally independent individuals aged 84 years and older, and the other group was nearly 20 years younger. The effect of aging was greatest on visual perceptual and constructional tasks rather than on memory tasks. Many cognitive functions were relatively well preserved in the optimally healthy oldest old.
Address correspondence and reprint requests to Dr. Diane B. Howieson, Neuropsychology Section (116B), VA Medical Center, P.O. Box 1034, Portland, OR 97207.
Supported by grants from the Department of Veterans Affairs, National Institute on Aging, National Institutes of Health (AG08017), Alzheimer's Disease Center of Oregon, and Medical Research Foundation of Oregon.
Received December 21, 1992. Accepted for publication in final form February 10, 1993.
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