To you, that angry, horn-blasting tailgater is suffering from road rage. But doctors have another name for it -- intermittent explosive disorder -- and a new study suggests it is far more common than they realized, affecting up to 16 million Americans.

Traffic stacks up on the highway south of Atlanta May 9, 2006. Atlanta was named one of the five cities with the least amount of road rage in a survey released May 16, 2006, by Norwalk, Conn.-based AutoVantage, an automobile membership club offering travel services and roadside assistance. [AP]

"People think it's bad behavior and that you just need an attitude adjustment, but what they don't know ... is that there's a biology and cognitive science to this," said Dr. Emil Coccaro, chairman of psychiatry at the University of Chicago's medical school.

Road rage, temper outbursts that involve throwing or breaking objects and even spousal abuse can sometimes be attributed to the disorder, though not everyone who does those things is afflicted.

By definition, intermittent explosive disorder involves multiple outbursts that are way out of proportion to the situation. These angry outbursts often include threats or aggressive actions and property damage. The disorder typically first appears in adolescence; in the study, the average age of onset was 14.

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