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> The test-retest reliability (repeatability) of the Race IAT is only .42, which falls well below the psychometric standard of .80. Your score on the IAT can fluctuate significantly from one testing to the next. Hart Blanton, a psychologist at the University of Connecticut, has noted the ease with which people can decrease their racial bias score “by simply exposing people to pictures of African-Americans enjoying a picnic.”
> The validity of IAT scores has also come under scrutiny. In 2013, Frederick Oswald and his research team published a meta-analysis of 46 studies.[1] They found that IAT scores are poor predictors of actual behavior and policy preferences. They also found that IAT scores predicted behaviors and policy preferences no better than scores on simple paper-and-pencil measures of prejudice.
> Perhaps the most interesting feature of the debate concerns how to interpret IAT scores. Some social psychologists believe the IAT measures prejudice, while others believe the IAT measures our knowledge of common stereotypes.
> They then took a version of the Race IAT with Noffians and Fasites standing in for Blacks and Whites, respectively. The students showed a consistent bias against Noffians, not because they perceived Noffians as bad but because they perceived them as bad off.