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> How's that work ? I don't know but it reminds me of a time long ago during my physio training years. A colleague used to walk with a PWP every day along the corridor of the hospital every morning. It was hard going, with a walker. Until one day there was a fire scare in the electro department ( turned out just a lof of smoke) and we were stunned to see this elderly PWP run alone along the passage shouting in a loud voice: Help! women and old people first. No need to say he lost his voice and ability to walk as soon as someone told him there was no danger. It is a fact that freezing can be unblocked by a very sudden stimulus, the same reason a PWP will be able to step over a sudden obstacle ( hence the laser or the stick with a bit sticking out) but the effect wears off if used too often. Must be linked with different brain circuits being used to start the movement. maryse ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn