 Introspective or subjective reports of conscious experience have also played an important role in the search for the “neural correlates of consciousness” (as reviewed in Rees and Frith 2007; Prinz 2012; Koch et al. 2016; see also Varela 1996). One paradigm is for researchers to present ambiguous sensory stimuli, holding them constant over an extended period, noting what neural changes correlate with changes in subjective reports of experience. For example, in “binocular rivalry” methods, two different images (e.g., a face and a house) are presented, one to each eye. Participants typically say that only one image is visible at a time, with the visible image switching every few seconds. Researchers have sometimes reported finding evidence that activity in “early” visual areas (such as V1) is not temporally coupled with reported changes in visual experience, while changes in conscious percept are better temporally coupled with activity in parietal and maybe also frontal areas further downstream and to large-scale changes in neural synchronization or oscillation; however, the evidence is disputed (Lumer, Friston, and Rees 1998; Tong et al. 1998; Tononi et al. 1998; Polonsky et al. 2000; Tong, Meng, and Blake 2006; Kamphuisen, Bauer, and van Ee 2008; Sandberg et al. 2013; Frässle et al. 2014; Ishiku and Zeki 2014; Tsuchiya et al. 2015). Another version of the ambiguous sensory stimuli paradigm involves presenting the participant with an ambiguous figure such as the Rubin faces-vase figure: