 A common approach, the contrast strategy, enjoins experimentalists to identify relevant correlates for some phenomenon P by contrasting cases where P is present from cases where P is not. Work on binocular rivalry illustrates this strategy (among many reviews, see Tong, Meng, &amp; Blake 2006; Blake, Brascamp, &amp; Heeger 2014). When each eye receives a different image simultaneously, the subject does not see both, say one stimulus overlapping the other. Rather, visual experience alternates between them. Call this phenomenal alternation. An initial restatement of our question about specific consciousness in respect of binocular rivalry is: