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Hi Brian, The gentleman with whom we exchanged views on falling and visual stimuli was Tom (I think Reiss). I am not qualified to judge his theories on visual stimuli and said as much in one of my postings at the time. I also acknowledged that visual stimuli (e.g. chequered floors, lines on the ground) were known to have an effect on our ability to move. Where we did disagree was on the matter of whether the arms should swing or be held behind the back,held out in front of the face etc. (you make no mention of what you were doing with yours during your recent experiment) . The discussion became impossible to continue when it became apparent that Tom was using the common vocabulary of PD but assigning his own definitions to the words (which may explain why some months ago I had trouble making sense of his original posting on the subject). In thinking about the matter since the discussion I have wondered whether in fact techniques could be devised to combine the undoubted advantages of swinging the arms, with the improvement in gait Tom reports from his experiments. I ended my last posting on that subject by wishing Tom well with his research. I have no hesitation in repeating that wish now. Dennis +++++++++++++++++++++++++++ Dennis Greene 48/11 [log in to unmask] http://members.networx.net.au/~dennisg/ +++++++++++++++++++++++++++