Psych Of Aging Exam study guide

The neural patterns of younger and older adults

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The neural patterns of younger and older adults differ significantly. Where as younger  adults’ brain activity is localized in one hemisphere of the brain, older adults’ brain  activity appears in both hemispheres or more than one location. Bilateral activation in older adults may serve a supportive role in their cognitive  functioning Major differences between HAROLD and STAC models brain activation and aging The HAROLD model suggests that the bilateral activation found in older adults is a  compensatory In that additional neural units are recruited to increase resources The STAC model suggests that the reason older adults perform at high levels despite  neuronal deterioration is because of compensatory scaffolding or the recruitment of  additional circuitry to bolster functional decline. However, this model further states that  compensation is the brain’s response to challenge in general. How does aerobic exercise influence cognitive aging? Higher level of aerobic fitness are associated with the preservation of the hippocampus  (involved in learning and memory) in older adults. Chapter 3 Rate-of-living theories explain aging These theories are based on the idea that everyone is born with a certain level of  energy that can be spent or expended at a level unique to the individual. Metabolic processes such as eating fewer calories or reducing stress may be related to  living longer Declining ability to adapt to stress can also be related to aging  Major hypothesis in cellular theories of aging  Cellular theories suggest that there may be a limit on how often cells may divide before  dying (known as the Hayflick limit), which may partially explain aging.
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A second group of cellular theories relate to a process called cross-linking that results 
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