 How is metacognitive assessment of performance tied to consciousness? The metacognitive judgment reflects introspective assessment of the quality of perceptual states and can provide information about the presence of consciousness. For example, Peters and Lau (2015) tested whether normal subjects have unconscious vision under conditions of visual masking, a method that seems to eliminate conscious vision to a stimulus but allows for accurate visually guided behavior to it (Breitmeyer &amp; Ogmen 2006). They presented stimuli in two temporal “windows” under masking but where the stimulus was present in only one window and a “blank” present in the other. If subjects accurately respond to the stimulus but showed no difference in metacognitive confidence in respect of the quality of perception of the target versus of the blank, this would provide evidence of the absence of consciousness in vision (effectively, blindsight in normal subjects;  section 4.2).  Interestingly, Peters and Lau found no evidence for unconscious vision in their specific paradigm.