  As with the investigation of animal pain, fine-grained analysis of the neural correlates of consciousness may reveal subtle differences between different species.  For instance, Rees et al. (2002) report that while the behavior of rhesus monkeys is rather similar to humans under conditions of binocular rivalry, “the firing of most cells in and around V1 primarily reflects stimulus properties rather than the conscious percept reported by the animal ... However, several neuroimaging studies in humans have presented evidence that argues for a stronger role of V1 in binocular rivalry and hence, by implication, visual awareness.” Nevertheless, it is noteworthy that they take the behavioral evidence to be unproblematically describable as report of a conscious percept by the monkey.