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At the structure of the brain. we know that when alzheimer's strikes, it strikes the memory portions of the brain first. so, we can look at those memory portions and see if they're shrunken. if they are, that's important evidence the person has alzheimer's. >> this is a scan of my brain. later we'll tell you what dr. cummings saw. another part of the exam is memory testing. since alzheimer's affects the ability to learn and remember new information, doctor cummings is looking at my memory and recall skills. >> grass. engine. >> good. now, tell me as many of those words as you can remember. >> ...

>> the memory part is often affected first. what people don't realize about alzheimer's is that it really does affect the brain so people start having all sorts of different problems with movement -- >> headaches? >> they can have headaches. but movement, swallowing, normal respirations, heart beat, heart rate, all of that. that's why alzheimer's is typically fatal. >> but at ruvo center, ron reagan and i wanted to see how doctors made their diagnosis. >> right this way. >> between the two of us, only one decided to be tested to see if we were at risk. that's me getting ready for an mri. it's ...