I don't understand this but apparently studying Zebra Finch learning songs could help understand speech disorders such as in PD in humans there is a video a couple of minutes long. http://www.physorg.com/news189258739.html Ray Rayilyn Brown Past Director AZNPF Arizona Chapter National Parkinson Foundation ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn