Journal
NEUROBIOLOGY OF AGING
Volume 27, Issue 10, Pages 1405-1415Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.neurobiolaging.2005.07.019
Keywords
MRI; DNMS; medial temporal lobe; aging; cognitive decline
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Funding
- NCRR NIH HHS [RR-00016] Funding Source: Medline
- NIA NIH HHS [AG10606, AG003376, AG09973] Funding Source: Medline
- NINDS NIH HHS [NS16980] Funding Source: Medline
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Aged monkeys exhibit deficits in memory mediated by the medial temporal lobe system, similar to the effects of normal aging in humans. The contribution of structural deterioration to age-associated memory loss was explored using magnetic resonance imaging techniques. We quantified hippocampal, cerebral and ventricular volumes in young (n = 6, 9-12 years) and aged (n = 6, 24-29 years) rhesus monkeys. Eleven subjects were tested on a recognition memory task, delayed non-matching-to-sample (DNMS). Compared to young animals, aged monkeys exhibited robust teaming deficits and significant memory impairments when challenged with longer retention intervals. Hippocampal volume was statistically equivalent across age groups, differing by less than 6%, and there was no correlation between this measure and DNMS performance. Variability in cerebral volume was greater in the aged compared to young monkeys and this parameter was marginally correlated with DNMS performance with a 10-min delay. These findings confirm and extend the conclusion of recent post-mortem histological analyses demonstrating that normal cognitive aging occurs independently of gross structural deterioration in the primate hippocampus. (c) 2005 Elsevier Inc. All rights reserved.
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