A new study presented liberals and conservatives with a variety of positive and negative images (i.e. kittens, car wrecks):
Our evolution as human beings has programmed all of us to pay heightened attention to threatening or frightening stimuli. But conservatives were drawn to the negative images almost twice as fast as the liberals were. And they fixated there longer, too. This suggests that there exists not only a physiological difference, but also a cognitive one in how political partisans react to such pictures. …
"I figured because conservatives reacted more strongly to negative things, they’d be more likely to avoid them," said Mike Dodd, an assistant professor of psychology and the study’s lead author. "That ended up not being the case. They ended up locking onto them quicker and taking more time on them, which makes sense from a policy perspective. Oftentimes they end up confronting things that they think of as threats."
The Dish 