Just a thought, but what if depression does not look the same in everyones brain? I mean I just hope we don't end up with people who have symptoms unable to get a diagnoses or needed help because their brain does not match up to a specific mold of what the brains of people with that mental disorder is supposed to look like.

So I think it is still important to focus on symptoms as well as the biological aspect...nothing wrong with researching what goes on in the brain to cause the symptoms...but then there is the fact that everyones brain is different and so maybe different physical causes in the brain can create the same disorder. I suppose more research in that area might prove just that. Also they should focus on biological, genetic and social/environmental factors.