Coruscation

Betty Hart and Todd R. Risley's landmark 1995 book, "Meaningful Differences in the Everyday Experience of Young American Children," shows that parents who supply a language-rich environment for their children help them develop a wide vocabulary, and that helps them learn to read.

The book connects language use at home with socioeconomic status. According to its findings, children in higher socioeconomic homes hear an average of 2,153 words an hour, whereas those in working-class households hear only about 1,251; children in the study whose parents were on welfare heard an average of 616 words an hour.

The question is: Will devices like smartphones change that? Smartphone users tend to have higher incomes; research from the Nielsen Company shows that they are twice as likely to make more than $100,000 a year than the average mobile subscriber. If increased use of technology encroaches on the time that well-to-do families spend communicating with their children, some could become the victims of successes originally thought to help them.