With the emergence of the fields of social-affective and contemplative sciences researchers have started thinking about the challenge to integrate first-person subjective reports with the traditional third-person objective measurements of behavior, brain, and body. A good example for such an integrated approach is plasticity research based on mental training studies. Thus, recent findings have suggested that training of mental capacities such as attention, mindfulness, empathy and compassion is indeed effective and leads to changes in both subjective well-being as well as in brain functions, health, and behavior. As an example for plasticity research, I will introduce the ReSource Project, a large-scale interdisciplinary and multi-methodolo...