http://www.wired.com/autopia/2009/11...mes-road-rage/

She found the rats that had breathed gas fumes were more likely to exhibit aggressive behavior such as chattering their teeth, arching their backs and biting. Rats exposed to unleaded fuel were slightly more likely to show aggression than those exposed to leaded fuel.

“Rats exposed to unleaded gasoline showed indications of increased damage caused by free radicals and altered levels of neurotransmitters in the brain cortex region, in comparison with the control or leaded-gasoline groups,” she said. “Furthermore, inhalation of both fuels induced significant fluctuations in neurotransmitters in the hypothalamus, hippocampus and cerebellum.”
Original study:
http://www.biomedcentral.com/1472-6793/9/21/abstract

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It all suddenly starts to make sense, actually... how so many people (myself included) can be one person in real life, and another person entirely behind the wheel...