May 11 (CBS HealthWatch) The key to finding yourself may be in the right frontal lobe, a new study suggests. Bruce Miller, MD, a neurologist at the University of California in San Francisco, first became interested in the subject when he noticed dramatic personality changes in patients of his who had a rare type of memory disorder called frontotemporal dementia. He recalls how one high-powered real estate agent quickly downscaled her tastes even though she still had plenty of money.

WASHINGTON (AP) -- A 300-page summation of decades of research on exercise is bringing scientists face-to-face with how little they know.Consensus statements published by the American College of Sports Medicine establish that people who exercise improve their health. But researchers often can't tell how much health-improvement payoff will result from a given amount of work, or even if a workout will make a difference at all.