I am happy to see this link. Now there is good news for mothers -- that is another post
http://www.sciam.com/article.cfm?id=parents-peers-children&page=3But more important, is the study of the class and how it works.
I don't know about small children (but I expect it is similar), but undergrad classes have an interesting dynamics. In most colleges, a group of students go through college together.
All classes are a mix of maybe 10-15% of students who are really interested in academics, about 40-50% who are there because they must study for some undiscovered reason, and the rest because they were put in college and told to get a degree of which a few are downright rowdies.
I teach these classes Chemistry for three years. (the % figures are just guesses though)
In some classes, the rowdies of the class,though few, make a great mark in it. The whole class slides. The once enthusiastic learners become apathetic and the once apathetic become useless. This trend starts by the middle of their first year and gains momentum throughout their stay in college. I lose the battle by their second year. I stop giving assignments(noone does them), or any extra inputs(noone cares) and just deliver my lecture and go home.
In other classes, the top 10-15% are the ones who dominate. The bright ones shine, lead discussions in class, ask questions. They make my lectures such fun, that I look forward to their class --and I have to read up well before such classes. These students end up in good institutions for their PG, go on to a research career.
The once apathetic ones perk up, do assignments, read what I ask them to read and by the end of three years, become quite good. Even the once rowdy elements, do a fairly good job and pass with decent marks. It is amazing and I never forget that class.
But try as I might, I cannot control the dynamics...I can only observe it.
I am not sure why...perhaps it is the numbers as the article says.