Interesting passage from the NYT article Why the Imp in Your Brain Gets Out by Benedict Carey which discusses Daniel M. Wegner's paper published in Science this week, How to Think, Say, or Do Precisely the Worst Thing for Any Occasion. Carey writes:
Efforts to be politically correct can be particularly treacherous. In one study, researchers at Northwestern and Lehigh Universities had 73 students read a vignette about a fictional peer, Donald, a black male. The students saw a picture of him and read a narrative about his visit to a mall with a friend.
In the crowded parking lot, Donald would not park in a handicap space, even though he was driving his grandmother’s car, which had a pass, but he did butt in front of another driver to snag a nonhandicap space. He snubbed a person collecting money for a heart fund, while his friend contributed some change. And so on. The story purposely portrayed the protagonist in an ambiguous way.
The researchers had about half the students try to suppress bad stereotypes of black males as they read and, later, judged Donald’s character on measures like honesty, hostility and laziness. These students rated Donald as significantly more hostile — but also more honest — than did students who were not trying to suppress stereotypes.
In short, the attempt to banish biased thoughts worked, to some extent. But the study also provided “a strong demonstration that stereotype suppression leads stereotypes to become hyperaccessible,” the authors concluded.