Differentiation Across Space and Integration Across Time

Distance can fool you. Something can be right in front of us and still feel unreachable, while a goal decades away can feel urgent and real. We lay out a simple but powerful map of human development built on two inseparable movements: differentiation, the expansion of what we can do in the world through action and motor competence, and integration, the expansion of coherent understanding through time via memory, attention, and purpose. From infancy to expertise, we track how these forces sha...