"All them <other race> people look alike!"
A study suggests that the sentiment crudely expressed in my subject line here is more than just redneck ignorance. The study indicates that our brains do very poorly at distinguishing between faces of people who are a different race than we are, and pins down a specific brain activity indicator of this.
These results show that N170, the highly-specific facial recognition signal, cannot discriminate between "other race" faces. This inability had not been known previously, and this study is the first to identify a possible neurophysiological basis of the other race effect.