My son,(let's call him Ghost since he already introduced self by this nickname)will sometimes blurt out something that is totally unfamiliar to me , but when I ask questions trying to further investigate his idea he will just say "Oh, just forget it" . I think he just thinks that his verbal still can't keep up with his racing mind, although he has been officially 12 for the last few days:-) It has nothing to do with motor ability. More of a mind not being able to sufficiently describe what is going on inside.
Ania