The largest such study is the recently completed ReSource project, in which my colleagues and I subjected almost 300 people, over 11 months, to an intense mental-training program, developed by a team of experienced mediation teachers, scientists, and psychotherapists. The goal was to cultivate a broad range of mental capacities and social skills, including attention, mindfulness, self-awareness, perspective-taking on others, empathy, compassion, and the ability to cope with difficult emotions like anger or stress.