CEA - ORSAY / CNRI / SCIENCE PHOTO LIBRARY CEA - ORSAY / CNRI / SCIENCE PHOTO LIBRARY
Brain in Alzheimer's disease. Positron emission tomography (PET) scans comparing the activity in the brain of a normal person (left) with that of a person with Alzheimer's disease (right). Here, the scans are showing the brains' metabolism of the amino acid methionine. Alzheimer's is caused by neuron and synapse (degeneration) and the formation of protein plaques in the brain. This abnormal loss leads to atrophy (wasting away) of the affected areas. Symptoms include memory loss, personality changes and confusion.
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