frontal lobes

part of the brain that is located in the front of the cereberal hemispheres,which continues to develop in humans until the age of about 20; has an important role to play in keeping an individual's behaviour in check. Whenever you use self-control to refrain from lashing out or doing something you should not, the frontal lobe is hard at work. Children often do things they shouldn't because their frontal lobes are underdeveloped. The more work done to thicken the fibres connecting the neurons in this part of the brain, the better the person's ability will be to control their behaviour. The more this area is stimulated, the more these fibres will thicken.

mine is hard at work.