Part 1: Mechanisms underlying brain changes during sensitive periods.- Development of functional properties in the early visual system: new appreciations of the roles of lateral geniculate nucleus.- Maturation of Corticolimbic Functional Connectivity during Sensitive Periods of Brain Development.- Microglia and sensitive periods in brain development.- Is Adolescence a Sensitive Period for the Development of Incentive Reward Motivation? Part 2: The influences of positive and negative factors during sensitive periods.- Physical Activity, Fitness and Executive Functions in Youth: Effects, Moderators and Mechanisms.- Nutrition and brain development.-Understanding sensitive period effects in musical training.- Sensitive periods for recovery from early brain injury.- Part 3: Community level impact of sensitive periods: analyses and applications.- Statistical Modeling of Sensitive Period Effects Using the Structured Life Course Modeling Approach (SLCMA).- Capitalizing on neuroplasticity across development to redirect pathways from juvenile justice involvement.