So parents matter a lot—a point made clear by decades of research showing that a major part of the academic advantage held by children from wealthy families comes from the “concerted cultivation(协作培养)of children” as compared to the more laissez-faire style of parenting common in working-class families. But this research also reveals something else: that parents, of all backgrounds, don’t need to buy expensive educational toys or digital devices for their kids in order to give them an edge. They don’t need to chauffeur their offspring to enrichment classes or test-prep courses. What they need to do with their children is much simpler: talk.

　　But not just any talk. Although well-known research by psychologists Betty Hart and Todd Risley has shown that professional parents talk more to their children than less-affluent parents—a lot more, resulting in a 30 million “word gap” by the time children reach age three—more recent researches are raising our sense of exactly what kinds of talks at home contributed to children’s success at school. For example, a study conducted by researchers at the UCLA School of Public Health and published in the journal Pediatrics found that two-way adult-child conversations were six times as effective in promoting language development as interludes in which the adult did all the talking. Engaging in this reciprocal back-and-forth gives children a chance to try out language for themselves, and also gives them the sense that their thoughts and opinions matter. As they grow older, this feeling helps middle-and upper-class kids develop into confident supporters for their own interests, while working-class students tend to avoid asking for help or arguing their own case with teachers, according to a research presented at American Sociological Association conference earlier this year.

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