Hal, my experience is the reverse. When I'm under a bit of stress, my speech deteriorates. For example, today I was in what turned out to be a 5 hour line up outside a clinic waiting for a swine flu shot. A CBC film crew singled me out of the thousands in the line to interview, probably because I was in sunglasses reading a book on my scooter and looked a bit unusual. When I watched the interview tonight on the evening news I noticed my speech was worse than it had been earlier in the day in just a social situation at work.