The frontal lobe is considered the seat of our intellect. It covers about half the human cortex and is the most recently evolved part of the brain. More specifically it mediates our executive functions, a group of psychological functions that serve to control our behavior. These include planning, abstract thought, impulse control, and the control of behavioral sequences. As might be imagined, impairment in these areas can lead to significant problems functioning in the world. The frontal lobe has other functions besides executive functions, though. The most posterior region of the frontal lobe is called the motor strip and is involved with intentional movements. Additionally, Broca’s area, on the left posterior side of the frontal lobe, mediates speech production, or the translation of thought into spoken words.