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The more parents talk to their children, the faster those children's vocabularies grow and the better their intelligence develops. The problem seems to be cumulative. By the time children are two, there is a six-month disparity in the language-processing skills and vocabulary of toddlers from low-income families. Toddlers learn new words from their context, so the faster a child understands the words he already knows, the easier it is for him to attend to those he does not. Dr Anne Fernald, of Stanford, found that words spoken directly to a child, rather than those simply heard in the home, are what builds vocabulary. Plonking children in front of the television does not have the same effect. Neither does letting them sit at the feet of academic parents while the grown-ups converse about Plato. The effects can be seen directly in the brain. Kimberly Noble of Columbia University studies how linguistic disparities are reflected in the structure of the parts of the brain involved in processing language. Although she cannot yet prove that hearing speech causes the brain to grow, it would fit with existing theories of how experience shapes the brain. Babies are born with about 100 billion neurons, and connections between these form at an exponentially rising rate in the first years of life. It is the pattern of these connections which determines how well the brain works, and what it learns. By the time a child is three, there will be about 1,000 trillion connections in his brain, and that child's experiences continuously determine which are strengthened and which pruned. This process, gradual and more-or-less irreversible, shapes the trajectory of the child's life.And it is this gap, more than a year's pre-schooling at the age of four, which seems to determine a child's chances for the rest of his life.