" Adults can distinguish race from very minimal clues. Stanford researchers showed subjects just the front slices of plain, black profiles—the face from forehead to chin, without the hair. Subjects could tell the race of the profile (80 percent of the time) more often than they could tell the sex (70 percent), or the age within 10 years (68 percent). Race is commonly equated with skin color, but all the profiles were black. It is obviously important for adults to tell the sexes apart, but they were even better at telling races apart.
Magnetic resonance imaging (MRI) has been used to determine that what is called the fusiform region of the brain may be associated with the other-race effect. The fusiform region is involved in expert appraisal. In a bird-watcher’s brain, for example, the region lights up at the sight of a bird. All people have considerable expertise in recognizing human faces, but MRI scans show greater fusiform activity—expert appraisal activity—when they are looking at faces of their own race. "

― Jared Taylor , White Identity: Racial Consciousness in the 21st Century