I've read a bit more about the doctor in that video I posted and I now think he is a bit of a crank.
https://observer.com/2016/08/head-ca...r-daniel-amen/
Nevertheless, that blows to the head causes brain injury is obvious. There are many videos on the net about this by more reputable scientists. The following video is not for the squeamish. It shows brains being cut up. It is interesting to see the brains like that. Of course, they don't look like the brains of any posters on here - ours are much smaller.
https://www.youtube.com/watch?v=iSO7_8XcGd8