The study makes a link between racism, certain conservative ideals and low IQ. They controlled for social influences like poverty and education.

I’m bringing this up to head off the inevitable inferences.

This does not mean holding conservative values is equivalent to having a low IQ. It is a one way link. Nor does it mean that holding conservative vales is equivalent to being racist. That too is a one way link.

Correlation is not causation. This needs to be repeated and understood.

The researchers turned to two studies of citizens in the United Kingdom, one that has followed babies since their births in March 1958, and another that did the same for babies born in April 1970. The children in the studies had their intelligence assessed at age 10 or 11; as adults ages 30 or 33, their levels of social conservatism and racism were measured.

As suspected, low intelligence in childhood corresponded with racism in adulthood. But the factor that explained the relationship between these two variables was political: When researchers included social conservatism in the analysis, those ideologies accounted for much of the link between brains and bias.

Nonetheless, there is reason to believe that strict right-wing ideology might appeal to those who have trouble grasping the complexity of the world.

“Socially conservative ideologies tend to offer structure and order,” Hodson said, explaining why these beliefs might draw those with low intelligence. “Unfortunately, many of these features can also contribute to prejudice.”

The researchers controlled for factors such as education and socioeconomic status, making their case stronger, Nosek said. But there are other possible explanations that fit the data. For example, Nosek said, a study of left-wing liberals with stereotypically naïve views like “every kid is a genius in his or her own way,” might find that people who hold these attitudes are also less bright. In other words, it might not be a particular ideology that is linked to stupidity, but extremist views in general.

“My speculation is that it’s not as simple as their model presents it,” Nosek said. “I think that lower cognitive capacity can lead to multiple simple ways to represent the world, and one of those can be embodied in a right-wing ideology where ‘People I don’t know are threats’ and ‘The world is a dangerous place’. … Another simple way would be to just assume everybody is wonderful.”

livescience.com