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Transient Ischemic attacks or Silent Strokes Some strokes can occur without being unnoticed. But even these can have a significant and lasting effect on memory, reports the June 2012 issue of the Harvard Women’s Health Watch. Silent strokes can create dead cells in the brain. The damaged areas are much smaller and harder to see than with a traditional stroke, and may not affect areas of the brain that control movement or speech. An ischemic stroke is a result of a blood clot cutting off blood supply. A hemorrhagic stroke is when a blood vessel bursts and can result in the same symptoms. The damage may not show up on an MRI or CT scan. Silent strokes may disrupt the