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Memory Loss and Amnestic MCI – Precursors of Alzheimer Diseas

Researchers at the Duke University Medical Center have found that Alzheimer’s damaged communication pathways between frontal and temporal lobes//, which are responsible for short-term as well as long-term memory power.

According to a new study published in the Journal of Radiology, early Alzheimer’s disease plus recent memory loss may be linked to change brain activities in several areas.

For the first time, researchers at Duke University Medical Center in Durham, N.C., used a special, high-field- strength, functional magnetic resonance imaging (fMRI) scanner to study the brain activity of people with amnestic mild cognitive impairment (MCI), a precursor to AD, and found altered functionality in both the frontal and temporal lobes of the brain. Previous studies looking at structural changes alone have shown evidence that brain atrophy in the earliest stages of AD tends to be restricted to the temporal lobe, a region critical to long-term memory formation.

‘Involvement of both the frontal and temporal lobes in the earliest stages of AD suggests the possibility of a breakdown in the communication pathway between these two regions, which house short-term and long-term memory, respectively,’ said lead author Jeffrey R. Petrella, M.D., associate professor of radiology and director of Alzheimer's Disease Imaging Research Laboratory at Duke. ‘So in many ways the AD brain may be like a computer that is having problems with both its temporary files and its hard-drive files.’

MCI affects an estimated 15 percent of the elderly population in the United States. Ten to 15 percent of people with MCI develop AD every year compared to one percent of the normal elderly population. Amnestic MCI is characterized by mild memory impairment and is often confused with ordinary age-related forgetfulness.

The researchers used 4-Tesla fMRI, which has a very strong magnetic field, to observe the brain activity of 20 elderly patients with amnes
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