These gamers also took the Moral Foundations Questionnaire (you can take the self-scorable test, here) to evaluate their psychological foundations of morality, such as whether they value loyalty to a group or whether they respect authority.
Many of us believe that when we feel down, we should try to focus inwardly and evaluate our feelings and our situation in order to attain self-insight and find solutions that might ultimately resolve our problems and relieve unhappiness.
This strikes me as the best way to evaluate this idea and leads us to ask the same question about personalized genomics that the quantified self movement asks about every other metric: will it improve performance.