On this edition of StudioTulsa, we chat by phone with Dr. John Ratey, an Associate Clinical Professor of Psychiatry at Harvard Medical School who's also well-known as an author, speaker, research synthesizer, and health/fitness/exercise advocate. Dr. Ratey will deliver a free-to-the-public address here in Tulsa on Sunday the 13th; the event happens in the Walter Arts Center at Holland Hall School (at 5666 East 81st Street), beginning at 7pm. He'll be speaking about the connection between exercise and the brain's performance (in both the young and old, both the fit and out-of-shape); he'll also address how even moderate exercise can charge one's mental circuits in order to beat stress, sharpen thinking, enhance memory, help us focus, and so forth. Dr. Ratey explores such topics with us on today's ST, and speaks in particular about his widely hailed 2008 book, "Spark: The Revolutionary New Science of Exercise and the Brain," which draws on research from near and far to prove that exercise is our best defense against everything from depression and ADD to aggression and Alzheimer's. (You'll learn more about Dr. Ratey's upcoming address in Tulsa here.)