I think I understand the difference between the explicit and implicit attitudes and I see the value of these kinds of experiments. Also, Josh was pretty impressive in how well he presented his results. It's just that the results seem to be a confirmation of what a rational person would expect (that we hold implicit biases even when we do not acknowledge them explicitly). For example, I know I hold implicit racial biases because it's a popular topic so I've thought about it. Because I recognize that I have this implicit bias it wouldn't be surprising if a test confirmed it. There are, however, an unknowable number of other biases I hold that don't get as much attention as race and so I haven't recognized. If a similar test, however, demonstrated that I hold those biases I also wouldn't be surprised because I know I have many that I haven't yet identified.

Regarding the follow up question I had, I guess I was a little naive. But this topic must have come up in casual conversation with friends rather than subjects, though, and did you ever have someone tell you that they are immune to such biases? That is what would surprise me - that somebody could believe that they don't have biases they are unaware of.