caption: This undated file image provided by Merck & Co., shows a cross section of a normal brain, right, and one of a brain damaged by advanced Alzheimer's disease. A dramatic shift is beginning in the disappointing struggle to find something to slow the damage of Alzheimer's disease: The first U.S. experiments with ``brain pacemakers'' for Alzheimer's are getting under way. Scientists are looking beyond drugs to implants in the hunt for much-needed new treatments.
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