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.
