Today in class we'll be discussing the roots of prejudice and discrimination. For some background, please read through this article: Racial Bias, Even When We Have Good Intentions.
It will provide you with some examples of how psychologists and other social scientists isolate and test for racial biases.
If you would like, after you finish the article you may choose to take an Implicit Association Test (IAT). This is one of the ways researchers have attempted to assess unconscious bias.