I had the feeling that once I found the left tongue that it would be fairly rapid in getting control of it. It has not been that way. I play with it one day and several days later it is slightly different than it was before. Most of what happens is below my level of awareness. I do try everyday to play with it frequently. Most of my current effort seems to be if I can see another person left eye with my left eye and try to use the left tongue to talk. The left eye to left eye seems bring on more subtle changes than I would imagine.