I fell and hit my head some four months before, and I had spent some time in hospital for about a week due to this. Apparently I had some bleeding in the brain, which dissipated over time after being released. Anyway I notice now that some things that I took interest in previously to the injury are no longer present. I am a proposal writer by profession and since then, I no longer care for doing that sort of work, which surprises me since I am quite literate and have always been. Also, being single I previously had an interest in my nephews and nieces as a sort of surrogate parent, which involved me teaching them skills that their own parents were unable or unwilling to show them. Now, I spend no time with them whatsoever, also I noticed that my previous personal interests such as watching classic tv shows is not there any longer. I can barely sit through even a half hour without doing something else. One thing that I noticed is that some of my previous habits have become more pronounced such as exercise, specifically gymnastic type movements.  Anyway, my question is; is it possible to have a change of personality if one takes a knock to the head? Even if rather minor? Consider that I was doing handstand pushups a few days out of the hospital, I don't feel really that different other than being a little subdued almost without any feeling or emotion.