By the age of two there is already a language disparity between rich and poor children
THE more parents talk to their children, the faster those children’s vocabularies grow and the better their intelligence develops. That might seem blindingly obvious, but it took until 1995 for science to show just how early in life the difference begins to matter. In that year Betty Hart and Todd Risley of the University of Kansas published the results of a decade-long study in which they had looked at how, and how much, 42 families in Kansas City conversed at home.
She measures how quickly toddlers process language by sitting them on their mothers’ laps and showing them two images; a dog and a ball, say. A recorded voice tells the toddler to look at the ball while a camera records his reaction. This lets Dr Fernald note the moment the child’s gaze begins shifting towards the correct image. At 18 months, toddlers from better-off backgrounds can identify the correct object in 750 milliseconds—200 milliseconds faster than those from poorer families.
Fortunately, taciturnity can be easily fixed. Telling parents is the first step: many who volunteered themselves and their children for study did not know they could help their babies do well simply by speaking to them. Her new study shows that the use of a LENA device, combined with a one-off home visit to give parents advice, produces a 32% increase in the number of words a child hears per hour after six weeks. Dr Suskind’s Thirty Million Words Initiative is now using LENA devices and weekly home visits to improve the linguistic diet of children in Chicago. Parents are taught to make the words they serve up more enriching.
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