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Memory problems not the only predictor of later mild cognitive impairment
Date:6/28/2010

Mild cognitive impairment is often seen as a transition stage between the cognitive decline of normal aging and the more serious problems of Alzheimer's disease. But what leads to mild cognitive impairment?

Researchers at Rush University Medical Center have found that lower, though not necessarily impaired, performance on tests measuring story learning or retention and processing speed in motor tasks dependent on visual control, as well as symptoms of depression, predicted subsequent cognitive decline in a normal population.

None of the factors alone predicted the onset of mild cognitive impairment a year later. Rather, poor learning had to be accompanied by either slower visuomotor processing speed or depressive symptoms to be significantly related to later problems in cognition.

Using an advanced statistical methodology that analyzed multiple variables at once, the researchers also found that neither gender nor the apolipoprotein E genotypelong believed to be risk factors for mild cognitive impairmenthad any substantial influence on later impairment.

The study is published in the July issue of the Journal of the International Neuropsychological Society.

"For a long time, researchers believed that memory alone was the only important factor in mild cognitive impairment," said Dr. S. Duke Han, assistant professor of neuropsychology in the Department of Behavioral Sciences at Rush and lead author on the study. "Our study is one of the first to suggest the importance of other factors in predicting this possible pre-Alzheimer's condition."

The 94 individuals who participated in the study underwent a battery of standard cognitive and psychosocial tests to assess mood, attention, visuospatial abilities, language facility, memory and intelligence. These included the Trail-Making Test, which measures motor speed, visual attention, and cognitive flexibility; the Wisconsin Card Sorting Test, which measures
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Contact: Sharon Butler
Sharon_Butler@rush.edu
312-942-7816
Rush University Medical Center
Source:Eurekalert

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