Thanks for this post Mike. I hope this reply doesn't come off as negative but I just see this study as giving support to all medical professionals who see RSD as an ailment that is "all in our heads". I didn't know rats had "old memories" or that there was a way to measure their physical pain. And, how does one measure a rats emotional response to pain? I wasn't even aware that rats had much going on in the emotion department. I just see this as a bunch of medical mumbo jumbo that works against us. But,thanks. Jeannie