The next time your parents complain that you're a slacker, and not a go-getter like your sibling, tell them this: it's your brain's fault.

Scientists have discovered that different levels of dopamine in three brain regions determine if a person is a go-getter or a slacker:

Dopamine does different things in different areas of the brain. So while high levels in some brain regions were associated with a high work ethic, a spike in another brain region seemed indicate just the opposite — a person more likely to slack off, even if it meant smaller monetary rewards.

"To our surprise, we also found a different region of the brain, the anterior insula, that showed a strong negative relationship between dopamine level and willingness to work hard," study researcher Michael Treadway, graduate student at Vanderbilt University, told LiveScience.

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