<p>Great topic!!! I have wondered same. I do know that one reason my younger son has not been motivated to do many EC’s is that he is a gentle introvert, and has been one since birth. He’s a great student, gets high marks, has done all his work with no pressure since early grade school, but comes home to nap every day after school. The very last thing he needs after 8 hours stuffed in a building full of talk and buzz is more of the same. Unfortunately, I think the EC craze puts this type of kid at a bit of a disadvantage, but the good news is he’s such a great kid - such a kind soul - that we know he’ll bloom where he’s planted. But it has been interesting to watch his temperment affect his motivation. And the other DS is more extroverted - so has been motivated to join a few more club type activities. Genetic? Perhaps - but far more complex than blue eyes / brown eyes. Soul stuff? I kinda think so!</p>