I am an active volunteer for a group called "Headway" here in the UK.? We offer support for both members and the families of people who have suffered brain trauma, either by accident, or by surgical process ie:? removal of a brain tumor.
Many of our members have undergone complete personality changes after suffering trauma according to their families who knew them beforehand.? Much of what they knew previously has to be re-learnt - ie: walking, talking, reading etc. Many initially have no "personality" of their own, and are like a blank page.? They have no preferences for things like food, music, etc - the endless list that we each have that make us individuals.?
In many cases its a matter of taking a brand new person, and teaching them how to live in the world again.? How well they recover is very dependent on how much nerve damage they suffered, and what specific part of the brain was affected.
Those who have suffered frontal lobe injury are the ones who have the most difficulty in re learning acceptable behavior.? According to our specialists, this is where our inhibitions are formed.? Damage to this area can result in a patient having impaired or no sense of right and wrong.?
For instance we have a lady member who has to be escorted where ever she goes for her own safety. This lady was very shy before her injury.? Since recovering she has become very uninhibited and will offer sexual favours to any available male. She propositions bus drivers, taxi drivers, men in the street - and has no concept of the danger she puts herself in, or the possible consequences for the men involved - she cannot empathise with their embarrassment, and sees absolutely nothing wrong with what she does.
I could cite other examples all day.? I have stories that would both horrify and amuse you, but then again maybe not, as many of them direct parallels with the behavior of our various BPD so's.
The very big difference between a person who has been brain injured and someone with BPD is IMHO that the brain injured person really does do not KNOW any different, whereas BPDs do know that their behavior is unacceptable and wrong.
With BPD it is a Personality Disorder, whereas a brain injured person it is a Personality Absense.
Nothing to say that someone cant have both though
We have one guy who had a really bad RTA, and is excused his dreadful behavior because of his head injury - I knew the guy for years before his accident, and believe me he was just as obnoxious before the crack to his head.
I hope I've explained that to ya all okay - sorry not very good with the technical jargon?