My dad began correlating the spinal curvature and its relationship to human behavior over 30 years ago. He just started looking at people generally, and he would take these standing and seated x-rays, front view and side view, full spine x-rays. He would look at one person who was very logical. Then he would take another person who was very logical and he would compare the two to try to find the common ground. And then over the years, we began to realize the common ground with the logic pattern is they are both left in a spinal curve. Call 562-420-8884 chiroman.com