I heard somewhere that when we want to do a repetitive movement of one finger (ex the index) . Our brain (in a very crude way) sends a first message to move all the fingers, and then a second message to hold the fingers that we don't want to move.
The person who said it, was explaining about brain evolution and the fact that the old reptilian part of our brain is the one that send the first message and the higher brain sends the second message.
So is that true ? If so, do other parts of our brain work like that too? For example more complex behaviors, like sexual mate choice?