Going Somewhere: An Ecological and Experimental Approach to Development of Mobility

This article formulates a framework for understanding mobility and how it develops. Research is summarized as a foundation for a theoretical framework. Studies are briefly described that deal with development of detection of a surface of support adequate for traversal, development of the ability to maintain equilib- rium during stance and bipedal locomotion, and development of guided locomo- tion on a path to a destination in a cluttered environment. The informational basis for perceiving essential behavioral supports is examined. The concept of affordance as it relates to and is constrained by developing exploratory and action systems is stressed as an essential part of the theoretical framework for develop- ment. Mobility development is seen as best approached within a functional systems theory with components, both perceptual and motor, coming together in the course of development to permit emergence of new skills, such as crawling and walking, in the service of going somewhere.