Ni, it does not :) It is still a mystery to the scientists why nature has created such a big brain for people as we are using such a small percentage of it. But on the other hand, if the brain was smaller there wold be only two options.
We would have empty space in out head, which is not right, and nature is efficient filling in empty spaces with something.
Our heads would be very small, which for me as a portrait photographer would be a disaster and we would never see those big and beautiful eyes with diluted pupils :)