"someone's hand being poked with a needle, and subjects have an "isomorphic sensorimotor" response--hands tense in empathy. Among both whites and blacks, the response is blunted for other-race hands; the more the implicit racism, the more blunting. Similarly, among subjects of both races, there's more activation of the (emotional) medial PFC when considering misfortune befalling a member of their own race than of another race." --