I will look when I get home. I know my DS5 is profoundly gifted and the tester talked about that sometimes being a problem in her evaluation of DS, and I am sure she quoted some sources. She put that in there mostly for the schools knowing that they were going to need that evaluation for appropriate planning for him. We worry about that as well with DS5. He went to first this year...but it still may be an issue. He has had 2 good days and one not so good one so far. We will see how today goes. I will give you the source later tonight after the kids are in bed.