( A new Mayo Clinic study finds that afte...)Decline in Concentration, Decision-Making and Problem-Solving,Health

A new Mayo Clinic study finds that after memory begins to decline, executive function is the next brain function to deteriorate in the progression from mild cognitive// impairment, a pre-Alzheimer's disease condition, to Alzheimer's disease.

Ron Petersen, M.D., Ph.D., Mayo Clinic neurologist and senior study investigator, says executive function includes concentration, decision making, and higher-order problem solving.

"If someone with mild cognitive impairment starts having trouble staying on task, concentrating, multitasking, making decisions or paying attention to several things at once, that would mean they are progressing toward dementia," he says. "A decline in executive function will cause people to become more impaired in their daily activities, as it is pretty important in daily function."

Dr. Petersen says that awareness of the typical progression to Alzheimer's will be useful for patients, their families and their doctors. In order to convert from mild cognitive impairment to Alzheimer's disease, patients must have impairment in memory and one other aspect of brain function.

"Knowing what area of cognitive function is likely to become impaired after memory helps us as we try to keep our eyes out for people when they are worsening," he says.

Awareness of a patient's functional decline informs neurologists what areas of the brain are being affected as mild cognitive impairment progresses to Alzheimer's: the medial temporal lobe is affected as memory declines, and then the frontal regions of the brain are affected as executive function worsens, according to Dr. Petersen. The lessening of these abilities indicates the buildup of more plaques and tangles in the brain. The buildup results from abnormal protein accumulation inside the cells and the deposit of abnormal material outside the cells in the brain, leading to a slowly degenerating neuron death and shrinkage of the affected brain regions.
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