Implicit Asociation Test

http://psychcentral.com/blog/archives/2008/08/18/top-ten-online-psychology-experiments/

"6. Project Implicit. The Implicit Association Test is a sorting test that assumes people don’t openly express their social biases. To gauge any unspoken implicit biases toward one’s own social group, the IAT measures interference between conflicting categories. Respond to words related to self and to and others’ faces, using different buttons – then the images switch and conflict arises when using the same button for those categories. Project Implicit has been running this experiment online for ten years and collected data from 3.5 million tests. From the original test about racial bias there are now also fun variants like “Are You Human or Alien?” The IAT is controversial – cognitive psychologist Chris of the blog Mixing Memory says, “…there is no real evidence that it measures attitudes, much less prejudices. In fact, it’s not at all clear what it measures, though the fact that its psychometric properties are pretty well defined at least implies that it measures something.” If results say you’re a space alien, that’s just a measure of fun."