It is scientifically proven that we can create brand new brain cells through stimulating our brains specific areas that have become lacking. For those with PTSD, many would understand that memory in general is one such area. Nintendo have had their brain training exercises out for some time now, all clinically backed. They are a good solution if you have spare cash to throw around, or, if you just want to stimulate the old brain when online to help improve your memory, there is one website that stands out beyond all else, which is backed with scientific study to prove results, being Lumosity. If I didn't rate it that highly, I wouldn't waste my breathe recommending it to the thousands of forum readers. It works, and not just for PTSD, but for anyone to help stimulate their brain, especially as we get older. Science has proved these memory games restimulate brain cell growth, thus holding back issues like alzheimer's and other memory conditions, along with those caused through abnormal trauma. Do yourself a favour if your memory is causing you great concern. Either use a credible online source or get yourself the Nintendo DS with brain memory games.