Self-doubting defeating evidence concerns the subject's knowledge of the evidential support relation, not the relation itself.

Christensen argues that the agent-specificity of self-doubting higher-order evidence requires the subject to “bracket” her first-order evidence in a way that other defeating evidence does not. He thinks this means that in no longer using the evidence to draw the conclusion, she will not be able to give her evidence its due (Christensen 2010a: 194–196). In contrast, in the case of the red light and other cases not involving self-doubt, once the redness of the light is added to the evidence, disco