There is a psychological test sometimes alleged to detect hidden stereotyping called the 'Implicit Association Test' (IAT):

http://en.wikipedia.org/wiki/Implicit_Association_Test

The usual interpretation of the IAT is that delays or errors in associating certain categories with positive/negative traits indicates hidden bias. But if a stereotype threat effect is also present when taking the IAT, then delays/errors may be arising from a (self-fulfilling) fear of confirming negative stereotypes about bias, moreso than any actual bias.

Since the IAT is often introduced as a way to detect subtle and stigmatized biases, test-takers are explicitly primed to worry about stereotypes-about-stereotyping. In this kind of use, the IAT might thus be more like a "push poll" (or a Scientologist's 'E-meter'), designed to create effects in the test-taker, than an objective measure of unprimed attitudes.