A recent Mother Jones article explores the cognitive neuroscience of racism, by way of the Implicit Association Test. This test, which you can take online, measures "racial prejudices that we cannot consciously control," writes Chris Mooney.
Sometimes you're asked to sort African American faces and "good" words to one side of the screen. Other times, black faces are to be sorted with "bad" words. As words and faces keep flashing by, you struggle not to make too many sorting mistakes.
And then suddenly, you have a horrible realization. When black faces and "bad" words are paired together, you feel yourself becoming faster in your categorizing—an indication that the two are more easily linked in your mind. "It's like you're on a bike going downhill," Amodio says, "and you feel yourself going faster. So you can say, 'I know this is not how I want to come off,' but there's no other response option."
You think of yourself as a person who strives to be unprejudiced, but you can't control these split-second reactions. As the milliseconds are being tallied up, you know the tale they'll tell: When negative words and black faces are paired together, you're a better, faster categorizer. Which suggests that racially biased messages from the culture around you have shaped the very wiring of your brain.
The good news: "Research suggests that once we understand the psychological pathways that lead to prejudice, we just might be able to train our brains to go in the opposite direction."