At Wit's End: Is this thing working?! A Guide to Better Brain Function by Stephanie Reese, PhD with Andrew Reese At Wit's End is a useful guide to brain function. It takes you through the basics of how nutrition, medication and environmental toxins can affect your brain. It also explans brain function in easy-to-understand language and what happens when someone is affected by ADHD, depression/anxiety, traumatic brain injury.   Download electronic version here. Be patient as it takes a couple of minutes. Also Available from: Amazon Barnes and Noble New Education Press