Why Do Poor Childs Fell Behind Richer Childs and Stay Behind

An interesting artcile from NYT on the upbringing of children and how it affects them later in life. Article excerpt:

There had, in fact, been evidence for a long time that poor children fell behind rich and middle-class children early, and stayed behind. But researchers had been unable to isolate the reasons for the divergence.

Researchers began peering deep into American homes, studying up close the interactions between parents and children ...They found, first, that vocabulary growth differed sharply by class and that the gap between the classes opened early. By age 3, children whose parents were professionals had vocabularies of about 1,100 words, and children whose parents were on welfare had vocabularies of about 525 words. The children’s I.Q.’s correlated closely to their vocabularies. The average I.Q. among the professional children was 117, and the welfare children had an average I.Q. of 79.

When Hart and Risley then addressed the question of just what caused those variations, the answer they arrived at was startling. By comparing the vocabulary scores with their observations of each child’s home life, they were able to conclude that the size of each child’s vocabulary correlated most closely to one simple factor: the number of words the parents spoke to the child. That varied greatly across the homes they visited, and again, it varied by class. In the professional homes, parents directed an average of 487 “utterances” — anything from a one-word command to a full soliloquy — to their children each hour. In welfare homes, the children heard 178 utterances per hour.

What’s more, the kinds of words and statements that children heard varied by class. The most basic difference was in the number of “discouragements” a child heard — prohibitions and words of disapproval — compared with the number of encouragements, or words of praise and approval. By age 3, the average child of a professional heard about 500,000 encouragements and 80,000 discouragements. For the welfare children, the situation was reversed: they heard, on average, about 75,000 encouragements and 200,000 discouragements. Hart and Risley found that as the number of words a child heard increased, the complexity of that language increased as well. As conversation moved beyond simple instructions, it blossomed into discussions of the past and future, of feelings, of abstractions, of the way one thing causes another — all of which stimulated intellectual development.