He discusses the developmental terms of the creative genius, (you and I), but I feel like this article which is on the Psychology Today Blog, is completely misdirected. It accounts for the classic, "hard life, deep emotional artist" case; claiming that people who grew up in comfortable homes are intelligent but less likely to be creative. I agree this could be a trend, but I feel the diversity in the art world is very difficult to write about and this is just an attempt at dissecting it. Its hard to say what developmental factors led to our creative genius, but I think each kid has the chance to hold a cheap crayon when they are little and it may be a hit with them or it may not, its just a personal difference.
I am a twin, both my brother and I drew/colored when we were little, I was the one who just continued, because I got something else out of it, instead of him.