Implications of the dynamical system approach to understanding movement dysfunction in infants are discussed. Traditional theories of motor development attribute changes in motlement to the hierarchical maturation of the central nervous system. The dynamical systems approach emphasizes that movement self organizes as the result of the interaction of the participating subg~stems in developmental and real time. In this article, I discuss, from the theoretical perspective of the dynamical systems approach, the organization of leg movements in low- and high-nsk pretemz and full-temz infants, developmental changes in movement in low-risk preterm infants from 34 weeks ' gestational age to 40 weeks ' posgestational age, and dzferences in movement between louj-risk preterm infants at 40 weeks ' postgestational age and full-term infants. Preliminary data on h@-risk preterm infants are presented. Based on these data, the necessip to revieul and reinterpret traditional concepts of motor development is explored. Suggestions are offwed and questions posed on how the djlnamical systems perspective may influence the practice of physical therapy in the evaluation and treatment of infants at risk for movement dysfunction. [Henza CB. Implications of a dynamical?]stem approach to understanding infant kicking behavior. Phys Ther. 1991; 71:222
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