ross thompson a distinguished professor of psychology. >> thank you for coming. >> my pleasure. >> you're doing parent/child development in the first three years. tell us about that. >> we study parent/child relationships and our appreciation for the importance of what is going on in these every day encounters between a responsive adult and interested child. our appreciation of that is really grown because of the work on early brain development because of the ways researchers and neuroscientists have focused on how explosive is the growth of the brain in the early years of life and how much the brain grows as a result of how it's stimulated by social interaction like these, adults who are singing and otherwise being responsive to what a child's interests are. >> it's interesting because so many new parents want to have the baby in a quiet room and don't say anything, don't take them around big crowds and i have other parents who take them out to baseball games. >> that's right. >> that's a lot of stimulation. >> it is possible. it is -- you can overstimulate a young child and overstimulat