As SDT has expanded, both theoretical developments and empirical findings have led SDT researchers to examine a plethora of processes and phenomena integral to personality growth, effective functioning, and wellness. For example, SDT research has focused on the role of mindfulness as a foundation for autonomous regulation of behavior, leading to both refined measurement and theorizing about awareness. The study of facilitating conditions for intrinsic motivation led to a theory and measurement strategy regarding vitality, an indicator of both mental and physical wellness. Work on vitality also uncovered the remarkable positive impact of the experience of nature on well-being. Some research within SDT has more closely examined the forms personal passions can take, with individuals being obsessive or harmonious as a function of internalization processes. And cross-cultural tests of SDT have led to an increased understanding of how economic and cultural forms impact the invariant aspects of human nature. Research on wellness has also led to new theory and research on the assessment of well-being itself, including the distinction between hedonic and eudaimonic forms of living. Specific topics such as autonomy versus controlled motivation has led to greater understanding of internalized control such as ego-involvement and contingent self-esteem and of the differences between them and autonomous self-regulation. Indeed these few examples supply just a taste of how the generative framework of SDT has enhanced research on a variety of processes of interest to the field.