"What's really fascinating is that there have been a number of recent studies looking at brain structural differences between liberals and conservatives," said Saltz. "And what's been found in several studies is that liberals tend to have a larger anterior cingulate gyrus. That is an area that is responsible for taking in new information and that impact of the new information on decision making or choices. Conservatives tended on the whole to have a larger right amygdala. Amygdala being a deeper brain structure that processes more emotional information--specifically fear-based information" [...]

"Basically the study showed that if you just based it on brain structural size difference, you could predict who would be a conservative and who would be a liberal with a frequency of 71.6 percent; 71.6 percent is a pretty high ability to predict who is a conservative and who is a liberal just from brain structure," Saltz said.