GGG- my younger son is not introverted. He just won't perform unless he wants. For example, he has refused to speak one word of Spanish. Then, while he was sitting in the bathroom, he recited 1-20 in Spanish. I found out he knew how add and subtract by playing a Cars math game. We had never shown him any math before since he won't even answer questions like "what number is that?" It's very frustrating to try to figure out where he's at. His latest obsession is wanting to know how everything works and how things are made.