In a recent study by thedevelopmental psychologist Laurence Steinberg at Temple University, teenagers did a simulated high-risk driving task while they were lying in an fMRI brain-imaging machine.
Caveat: Thestudy excluded multiple births, which are associated with increased risk of developmental problems, limiting the findings to single gestations, researchers said.
Dr Wolf Reik, an expert in developmental genetics at the Babraham Institute in Cambridge, told the BBC News website thestudy was "interesting and intriguing".