The dynamics of structural and functional complexity across the lifespan.

The paper addresses the process of human physiological development and aging from the perspective complexity at the structural level and functional levels. The goal is to present a view of the human lifespan as a continuous increase in structural complexity of the human system, resulting in increased independence of the physiological subsystems. This brings about an increase in functional complexity early in the lifespan and an eventual loss of complexity during human aging (Lipsitz & Goldberger, 1995). Different nonlinear dynamics concepts are presented as a means of providing support for this theory of human aging and development.