It makes sense that there's some connection with GTness, though I haven't seen any specific studies. The increased sensitivity of GT kids--particularly to stress--combined with the increased stress in the lives of underchallenged GT kids seems likely to make them migraine targets. (or at least more likely than ND kids, anyway...)

Migraines also run in families, just as GTness does. My mom and uncle have migraines, and though I don't know for sure, I'd guess both are probably vanilla GT or MG, perhaps higher. I also know that if one or more of your parents have migraines, chances are you will have them, too. (My sister and I both get them, and we were both GT kids.)

Dunno if that helps...

Kriston