is this one of those studies that we should be excited about immediately? or immediately is the key word, craig. this is very exciting. but we have to remember that it is an early, small-stage trial. . what we re going to do is i m going to demonstrate for you reporter: it could be a dramatic new treatment for alzheimer s disease. very promising. we re very excited about it. we d like to see it move forward into a larger trial. reporter: dr. suzanne kraft and her team gave volunteers a daily dose of a special insulin nasal spray, or a placebo. relax your leg. reporter: the 104 participants had alzheimer s or like john martin, pre-alzheimer s memory problems. after four months. three quarters of the people getting the insulin spray did better on memory tests. children saw lions. reporter: and on scans showing brain changes that signal memory loss. we were surprised by how many of the participants benefited.