The goal of this paper is to contribute to the revival of Heinz Werner's organismic-developmental theory by considering some of its key claims in relation to contemporary developmental theory and research. The organismic-developmental definition of development in terms of differentiation and integration is first discussed in relation to…

Studying human development involves describing, explaining, and optimizing intraindividual change and interindividual differences in such change and, as such, requires longitudinal research. The selection of the appropriate type of longitudinal design requires selecting the option that best addresses the theoretical questions asked about…

The theory of conceptual fields is a developmental theory. It has two aims: (1) to describe and analyse the progressive complexity, on a long- and medium-term basis, of the mathematical competences that students develop inside and outside school, and (2) to establish better connections between the operational form of knowledge, which consists in…

Through the application of life course theory to the study of sexual orientation, this paper specifies a new paradigm for research on human sexual orientation that seeks to reconcile divisions among biological, social science, and humanistic paradigms. Recognizing the historical, social, and cultural relativity of human development, this paradigm…

Adolescents often pursue learning opportunities both in and outside school once they become interested in a topic. In this paper, a learning ecology framework and an associated empirical research agenda are described. This framework highlights the need to better understand how learning outside school relates to learning within schools or other…

The study of neurobehavioral development focuses on the mechanisms through which the experiences of an individual influence the ontogeny of brain circuits that ultimately control complex functions, such as social engagement, mood and emotional regulation and cognition. Advances in experimental approaches and technologies provide opportunities to…