I can confirm this is 100% true for my children. So much so that when I can control the number of toys available to them (during quiet time in their rooms, for

I can confirm this is 100% true for my children. So much so that when I can control the number of toys available to them (during quiet time in their rooms, for example) I generally go with a small stack of books and one or two toys (typically a Lego or Lincoln log type toy, and a puzzle). I love when a study affirms something I'm doing...parenting usually feels like educated guessing...