We now know that many disorders are physiological, not psychological

... network of axons. By tracking these pathways, MUSC researchers are studying brain disorders including ADHD and Alzheimer's disease. The colors represent the direction water molecules are moving. Exhaustion weighs her down until she gets out of bed. ...

http://www.postandcourier.com/article/20130414/PC16/130419587/1165/we-now-know-that-many-disorders-are-physiological-not-psychological