As a scientist I have to say that this article has about as much intellectual credibility as a curly wurly. The science writers of the daily mail are, for want of a better word, thick. To say that this mans depresion was due to a childhood bump to the head is stupid, and to back up a stupid hypothesis they stupidly chose unrelated cases to back up the stupid argument, which resulted in a story with all the congriguity of one told by a schizophrenic on LSD.
I am sorry I am being arrogant but I read science all day, I know poor science writing when I see it and this is simply poor journalism.
However, a team of neurobiologists are studying the role between 'bumps to the head' and depression. They have been looking at the brains of American football players because of a tendency for those in this sport to kill themselves, and there is a hypothesis that incremental brain damage by repeated small bangs to the head may be causing psychiatric illness, and the evidence for this is strong.
I apologise again for being pugnacious, but I have an informed point of view so I may as well express it. Sorry to be rude I don't like to upset people