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The you have to remember one thing, and how it differs of the younger, 20s and 30s and when you are older in the 60s and 70s and we see that if you even have a simple memory test of holding one thing in mind, holding that one task decreases the memory and it is worse as you are older. >> it is worse because we are constantly interrupted all of the time whether it is the e-mail or the texting bell goes off on the phone? >> well, this would be an extrapolation of the finding. what, you know, in the lab you study, well, we study more one simple example of it which is just a picture of a face that...

In to use . they do human trials. >> it is sniffing insulin. >> that's right. they wanted to draw the insulin in the mucus misdemeanorory and they affected memory losses and different doses. those with lower doses of insulin had less improvement in the memory test and higher doze had better improvement. >> interesting, hope they can apply that. addiction to pain medication is up 400 percent in the last 10 years. this is consistent in demographics and ages. why it is over prescribed? >> part of that may be the problem. also we are more ark wear it is addiction and dependence . the other part is...

12 different words and then have the person look at that list of words and then try to memorize them over time and repeat them back five times. that was the secretary test. pep scan, memory test, if you did both those tests together and someone did not perform well, they had a 12 times more likely -- 12 times more likely to get alzheimer's disease within two years. this was -- as john mentioned, very important because that's the goal. trying to figure out who out of these people is most likely to develop alzheimer's. >> what is the benefit, sanjay, of finding out who is most likely to develop ...

Is most likely to develop. what you are looking at is a pet scan. it is an expensive test. $3,000 to $6 thousand. you notice suggest changes in someone that's going to develop alzheimer's. greener here as compared to here. >> what does that mean? >> glucose in the brain the way it is metabolized is different than someone else that has alzheimer's versus someone that has mild cognitive changes. that's a good predictor. if you combine that with a simple memory test, list of 12 words, ask someone to repeat them back five times, combine those two tests, it could -- abnormal 12 times roughly more l...

Us, chief medical correspondent dr. sanjay gupta live from atlanta. thanks for being with us. you know, a lot of people are interested in finding out whether they can tell early on which round of testing seems to work the best. >> no question. lot of people looking into this exact question. what they specifically are answering here, people with mild cognitive impairment think of that as confirmed memory loss. who is most likely to go on to develop alzheimer's disease. all sorts of different tests out there. what they found it was a combination of two tests. in particular, that were the best pr...