Canon has released a really cool commercial to promote their imagePROGRAF PRO-1000 printer. They have decided to track the movement of the eye as it views a photograph. They used three subjects; a non-photographer, a photography student, and a full time professional. This was done to illustrate where each of these subjects focused, and for how long.
The results are probably not all too surprising. It shows that as experience level grows so does our observation of detail. I think that a lot of photographers would nod in agreement that they do in fact spend a lot of time analyzing and scrutinizing their images. Perhaps more than a healthy dose. Often times we can be our own worst critics.
One has to wonder if we focus on details too much, or if this is in fact a good trait, and a sign of refined taste and knowing what to look for.