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Postmortem and computed tomographic studies demonstrate many anatomical, morphological, and neurochemical differences between brains of old and young human beings. The variability of the results is great, however, and brains of some old subjects have characteristics of brains of younger controls. Furthermore, important aspects of brain functional activity are not reduced in the elderly. These include resting cerebral oxidative metabolism and "crystallized" intelligence as represented by verbal subtests on the Wechsler Adult Intelligence Scale. In the absence of superimposed disease (which frequently limits aging studies), overall function can be maintained at high and effective levels because of the plasticity and redundancy capabilities of the human brain.
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