I have ADHD (Inattentive type) and was receiving treatment for it prior to my injury. Now, the meds barely work! I find it very intriguing that in some of the academic papers I've read about PCS, doctors are prescribing ADHD medicines to help people with recovery. My Neuro talked to me about how my concussion was going to make my ADHD much, much worse. He said that before, my brain would have many choices to make and often it would make the seemingly wrong one for no apparent reason. This is why I am so easily distracted; it is a "wrong decision" to devote resources where they aren't needed. He said that my ADHD meds make the decisions happen faster, which causes the brain to make more correct decisions than wrong ones. As a result of my injury, though, the speed at which my brain operates is much slower, hence my ADHD will be heightened.

I found the explanation intriguing, and so far it is true.