RSA Animate: The Divided Brain by Iain McGilchrist
The division of the brain is something neuroscientists don't like to talk about anymore. It enjoyed a sort of popularity in the '60s and '70s after the first split brain operations, and it led to a sort of popularization which has since been proved to be entirely false.
It's not true that one part of the brain does reason and the other does emotion. Both are profoundly involved in both. It's not true that language resides only in the left hemisphere. It doesn't. Important aspects are in the right. It's not true that visual imagery is only in the right hemisphere. Lots of it is in the left.
And so in a sort of fit of despair people have given up talking about it.