So what do Batman and J.R.R. Tolkien have in common? Post Traumatic Stress Disorder. It used to be called 'Shellshock' and it can be really really really destructive. In this episode of Crash Course Psychology Hank lays out the low down on PTSD and how trauma can affect the brain. Plus a look at how addiction can play into trauma and the different types of treatments used to help those afflicted.