gwen baumgardner report. >> so you pop this on, let's see if can i do it. >> at 72 years old mark ferland didn't know much about virtual reality but health proshes motivated the british grandfather to give it a go. >> well, i've been referred by my doctor for memory problems. >> ferland took part in a trial with researchers at the university of cambridge who tracked patient's virtual movements to help identify those with early alzheimer. >> so what we found is that people with-- based on this test. >> so you are turning and you are getting disoriented. >> ferland is one of 100 patients who had to follow a path in a virtual environment and then trace their footsteps back to the starting point without the help of any markers. ferland found out while he does have memory problems, he does not have alzheimer. >> that was an incredible relief and to find out that i was actually normal. >> dook tor-- doctors hope virtual reality will provide a new pathway to identify aldz alz in patients before symptoms even start, gwen baumgardner, cbs new, cambridge, england. >> quijano: when we return, how th