The next time someone says that they do not like your working style, blame it on the dopamine levels in your brain. According to a study published in the Journal of Neuroscience, dopamine levels in three different areas of the brain influence our willingness to work. The study used positron emission tomography ( PET) to image the brains of a cross- section of participants, from go- getters to slackers. The participants were asked to choose from a range of tasks— some simple, others far more difficult— in exchange for varying monetary rewards. The researchers found that people willing to work hard to earn rewards had higher release of dopamine— a “feel- good” neurotransmitter— in areas of the brain known to play an important role in reward and motivation— the striatum and ventromedial prefrontal cortex. People who weren’t keen to work, however, had higher levels of dopamine in part of the brain that plays a role in emotion and risk perception, called the anterior insula.