Bright poor children 'slip back'

robb1981 writes: The BBC Reports "Clever children from poor families face being overtaken by less bright children from affluent homes, research suggests." The report said: "Children in the poorest fifth of households but in the brightest group drop from the 88th percentile on cognitive tests at age three to the 65th percentile at age five. Meanwhile those from the richest households who are least able at age three move up from the 15th percentile to the 45th percentile by age five. "