[prbuckley]

This would have sounded crazy to me 6 months ago. However I had a friend who had a traumatic brain injury where the doctors had to remove a portion of their skull temporarily (a couple months) to releive pressure on the brain. The doctors told my friend that his brain function and parts of his personality may be different while parts of his skull was off, and sure enough it was. When they put his skull back together a couple months later his personality shifted. The stated reason the doctor gave had to do with differentials in blood pressure in the brain with and with out the skull entact. This was at a top hospital in San Francisco.

[Baeocystin]

A traumatic brain injury that is severe enough to require removal of a portion of the skull to relieve pressure from swelling is a critical medical event that has nothing to do with an otherwise healthy individual drilling a hole through their skull. Blood does not 'press on the brain' in a negative way in normal function. Far from it- being supported from all sides by a bath of CSF is critical to proper function. Remove that support from an unexpected area, and problems are likely, as you saw with your friend. The only reason they do such a radical procedure is to prevent a swelling brain from squeezing itself out through the hole that connects the brain to the spinal cord, as that progresses rapidly to death.

https://en.m.wikipedia.org/wiki/Cerebrospinal_fluid

//

I hope your friend is recovering well, and I wish them the best of luck in recovery. Brain injuries are frightening and frustrating, but the brain is amazing in its plasticity, too.

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[edit] for some reason, I can't reply to the comment below, so I'm posting my answer here, so you don't think I am ignoring your point. Personality change after TBIs is not a good thing. For a representative example: https://www.google.com/amp/s/www.psychologytoday.com/blog/pr...

[eriknstr]

>Personality change after TBIs is not a good thing.

Reminds me of a documentary I saw recently about snowboarder Kevin Pearce called The Crash Reel (2013) [1]. Kevin Pearce was changed by his TBI also but the one I came to think of when you said this was another person that was affected even worse from a TBI they got from a snowboarding accident.

[1]: http://www.imdb.com/title/tt2499076/

[Baeocystin]

That looks like an interesting documentary. Thanks for the link.

[elif]

You injected the word "problems" because it suited your argument... but OP used the words "different [..] personality"