Frank...I work with brain injured adult women...one of whom has Tourettes and a variety of other medical/emotional problems. Suggestion for your research...buy Mudcatter Musicman's cd "Farewell" (available directly from him or from Folk Legacy) and watch the magic happen. The only other piece of music I've seen have such an immediate dramatic effect on the patients is Bill Staines-"Alaskan Suite". I have found, for these particular women...that some folk music .. if the instrumentation is uncomplicated..(and am beginning to think,if the singer is a baritone, but not sure) helps. Classical selections seem to overstimulate one of the women..(still trying different selections). In my experience, Musicman's and Bill Staine's cd's stop a variety of "episodes" within seconds. All of the women are very susceptible to background noise levels (dishwasher, refrigerator motors etc.) and they are absolute sponges with music. I'm VERY interested in your research and how much you've done so far. I continue to feel we're missing something important here, that if it were studied more definitively, could be formalized into treatment plans.