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Leaves the lectern there. they think it was about 12 minutes later where he gets asked the question about how he is feeling. so he recovers fairly quickly, that is a long time when he is essentially frozen, and unable to speak. he is moving his arms and his legs fine afterwards, so that makes something like a stroke or some sort of tia less likely. although, you know, i think that is something that is reasonable he should get checked out. could this have been a mini seizure? it's cia. >> what is a tia standing for? >> dia stands for transient ischemic attack. that is a mini stroke. or it could...

Quick recovery. that's important. it could be a lot of different things. it could be common things, just dehydration, medication interaction, feeling under the weather. but the thing is, with something like this you have to rule out potentially more problematic things. was this a mini stroke, something known as a tia, or a mini seizure, which is something that can look that way as well. so that's why it's concerning. and it needs to be checked out. he's probably been seeing his doctors all along, you know, especially since march. but that was an episode that was quite obvious yesterday, omar. ...

I think that's really the bottom line. it's tough to speculate just based on tlooking at the video. when you look at the timing of that, it happened around 1:56. we just put the -- looked at the clock and it was 23 seconds before anyone said something to him, and he was essentially frozen or not saying anything for that period of time. 32 seconds when he was led away from the podium, and 12 minutes when manu asked him the questions and he said he was fine so he seemed to have recovered from it, but something clearly happened. it could be something more simple, dehydration, a little infection, ...

>> reporter: alzheimer's disease only causes about half of all the cases of dementia. there are a number of treatable causes, including medication interaction, thyroid problems, vitamin deficiency and even depression. knowing whether you have alzheimer's disease can really matter. dr. richard besser, abc news, new york. >> of course, all of this has been back in the news because of the feud within the reagan family. one of the things they say about alzheimer's, really the level of support you have from people in your daily life it will help you detect early signs. if you're a loner, it's harde...