Also concentration span comes from interest in a topic. This is a very interesting subject as the science behind it is remarkable. And the assessments are generally spot on. It helps people learn much more about themselves on a deeper more personal level. It also can assist in knowing yourself enough to help you persevere and pursue higher goals, pointing out possible weaknesses and how to overcome them. So if someone isnt intellectually stimulated enough by this topic, then they're probably not on my level of intellect anyway.