The cognitive revolution in the 1950s and 1960s led researchers to view the human mind--like a computer--as an information-processing system that encodes, represents, and stores information and is constrained by limits on hardware (the brain) and software (learning strategies and rules). The emergence of new behavioral, computational, and neuroscience methodologies, has deeply expanded psychologists' understanding of the workings of the infant, child, and adult mind. One result is that research has focused on mechanisms of change, over developmental time, in the information-processing mind....