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You've already lost 50% of your brain cells. it's very difficult for any treatment to be effective at that point. >> but what if you could spot the disease 5, 10, even 20 years before you became symptomatic? he says he may have found a way by looking at the eyes into the brain. >> normally we don't think of the eye as an extension of the brain, but during the embryonic development, the retina actually develops from the brain itself, so it's brain tissue. >> one telltale sign of alzheimer's is a build-up of sticky plaques called beta amyloids. they're inside the brain. they could start to devel...

At this one study about depression, we were also looking at another on those that suffer from migraines, and it seems electricity -- what do you call the therapy in general? >> electrical stimulation and also magnetic stimulation. jenna: so that it can be used for a broad spectrum of different things from depression to schizophrenia to parkinson's disease to migraines. >> yes. jenna: why in migraines? how does it work there? >> migraine is a little different. what we do for migraine is we don't stimulate the brain itself, we still hate the nerves around the skull, in the scalp p. and that will...