My guy was involved in a bombing in Northern Ireland. He suffered a very serious head injury - losing a piece of his skull about the size of a fifty pence piece. After spending about three month in a hospital, he was transferred to Chessington Army Rehabilitation Centre where he spent almost a year - coming home on weekends in a wheelchair - learning to walk and talk again. I sat in on quite a few sessions while the doctors painstakingly explained to us what was going on and what needed to be done for my guy to walk again. Something about other parts of the brain learning and taking over from the damaged parts, and about how the left side of the brain controls the right side of the body etc. I read some books to help me understand what he was going through and why he often got very frustrated with himself. This is a smart guy, a very logical thinking type of guy. He would explain how he thought about doing something like picking up a cup and thought he had only to realise that he hadn't, he just thought he had. I don't claim to understand it but I tried. It was all very confusing and often the books didn't help much at all.
I share that little anecdote to let you know the extent of my knowledge about the brain. Not much I'm afraid. But this doesn't stop me from being curious about it. Or about what the little blighter has got me believing. Or why it let me feed it all that crap!!!