So now we have it in black and white -- the emotional center in young men's brains overrides the area controlling their ability to make rational decisions. This leads to accidents among risk-seeking motorists. Last autumn thirty-four young people allowed their brains to be scanned while playing car race video games. The aim was to win. But the speeds were fixed and subjects only had the use of a start and stop button. A scanner recorded the activity in their young brains throughout.