I was watching a documentary (don't remember the name or the URL to the documentary) but they stated that the brain is layered and that each new layer is placed on top of the last. So the most primitive part of the brain that sends a signal to move the fingers actually has no way of moving just one, but in fact sends a message to just open and close the hand. That message is then passed on to a newer part of the brain that then filters it into individual finger movements.
I would like to know if this is true and how is the newer layer of the brain able to take an open-close message and identify what finger to move.
This sounds like a strange way for the brain to work; as I'm typing this message out at 86wpm, how is my brain doing such a complex task of moving all my fingers from an open-close message?