Whereas some four year olds could draw a person with five fingers on each hand and a full set of facial features, others could barely hold a pencil. Some sat quietly in a small group, intently listening to and understanding a story, while others wiggled, fidgeted, and couldn't focus their attention. In those days, before the explosion of…

Examines research on the importance of understanding children's biological timetables for mind and brain development, and forces that can threaten this neurodevelopmental timetable during critical periods. Discusses the brain's adaptability, and focuses on the importance of knowledge derived from the study of special populations for understanding…

A model of the sources and consequences of mismatches between gestures and speech is presented that argues that the transitional knowledge state is the source of the mismatch and that such mismatches signal that a child is in a transitional state of concept acquisition and is ready to learn. (SLD)