The frontal lobe is located at the front of the brain behind the forehead. It controls important functions like reasoning, planning, problem solving, motor skills, language, memory, judgment, and social/sexual behavior. Damage to the frontal lobe can cause changes in personality and behavior, loss of impulse control, and difficulty with movement, language, and complex tasks. Pick's disease and frontal lobe dementia specifically affect the frontal and temporal lobes, causing changes in behavior and language problems.