Woody points out that brain scans are useful for seeing how the brain functions during the speech of stutterers, but not in showing the "cause" of stuttering.
All the more, as someone else also pointed out, it would be very interesting to look at the patterns of those who claim to have to a large extent "recovered". If no difference from fluent speakers shows up, this would strengthen the notion that the scans only show behavior. If a difference shows up in "recovered" stutterers in spite of fluent speech, THAT would be interesting. Unfortunately neither occurrence, it seems to me, would prove or disprove a neurologic deficit, but it could add a piece to the puzzle.
I'd be glad to volunteer for a completely fluent performance with my head in the machine... (somebody please tell Luc).
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