US researchers say that brain tests at the age of three appear to predict a child's future chance of success in life. They say low cognitive test scores for skills like language indicate less developed brains, possibly caused by too little stimulation in early life. These youngsters are more likely to become criminals, dependent on welfare or chronically ill unless they are given support later on, they add. <br/><br/>Their study in New Zealand appears in the journal, Nature Human Behaviour. The researchers from Duke University say the findings highlight the importance of early life experiences and interventions to support vulnerable youngsters.<br/>