I have heard the same stuff Mike. Its interesting to think about. I believe I was born left handed, but by the age of 6 my right hand took over everything but throwing and writing. Although, I can write and throw with both hands just as well. I'm just more comfortable writing with my left since that is how i started. Anyway, i feel left hand dominant. I don't consider myself to be very creative, at least when it comes to being artistic. However, I'm very creative when put in analytical and practical situations. I tend to see outside of the box.
This makes me wonder if parents traits are handed down thru genes, and if that is not the bigger contribuator. It could be the environement we grow up in. How we see are parents come up with solutions to problems. If both parents differ, one being creative, and one being practical, makes you wonder how we end up being who we become. Great topic Mike