Evidence of 'risk-taking' brain

Scientists say they have found physical evidence of brain differences which may drive "thrill-seekers" to act impulsively or dangerously. A small study from Vanderbilt University in the US found the biggest "risk-takers" processed a brain "reward" chemical dopamine differently.

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The Journal of Neuroscience study could help explain why some are vulnerable to drug abuse and other addictions.

Animal experiments have already shown that, like humans, some respond differently to novel environments - and those who explore them are more likely to self-administer cocaine when given the chance.This behaviour is believed to be bound up in the activity of dopamine, a brain hormone which, among other things, can produce a sense of enjoyment connected with certain activities.