>> rosenbaum: fruits. >> stahl: ted did well on parts of the 90-plus exam, like repeating long stringse, eight, four, three. >> rosenbaum: three, four, eight, one, six. >> stahl: but when it came time to remember the three words she had told him just 40 seconds earlier... >> rosenbaum: three words... give me a hint. >> stahl: ...he was lost. and that wasn't his only problem. >> what is today's date? >> rosenbaum: today's date? >> uh-huh. >> rosenbaum: today's date? >> stahl: does he have dementia, at this point? >> kawas: yes. ted has dementia. >> stahl: he does. >> kawas: you know, unfortunately there's no blood test, there's no x-ray. it's an examiner finding out that an individual has problems in two or more of the main things the brain does for them. so that's where he is. >> stahl: and what's perhaps the most devastating is he knows it. >> rosenbaum: my worst condition is my memory. >> stahl: when you can't remember something, what goes on inside you? >> rosenbaum: terrible frustration and terrible... you know, it's... it's having more and more of a negative impact on me, psycholo