 Some philosophers have sought more specific grounding in the neurosciences for their accounts of consciousness.  Block (2005) pursues a strategy of using tentative functional characterizations of phenomenal and access consciousness to interpret evidence from the search by neuroscientists for neural correlates of consciousness. He argues, on the basis of evidence from both humans and monkeys, that recurrent feedback activity in sensory cortex is the most plausible candidate for being the neural correlate of phenomenal consciousness in these species.  Prinz (2005) also pursues a neurofunctional account, but identifies phenomenal consciousness with a different functional role than Block.  He argues for identifying phenomenal consciousness with brain processes that are involved in attention to intermediate-level perceptual representations which feed into working memory via higher level, perspective-invariant representations. Since the evidence for such processes is at least partially derived from animals, including other primates and rats, his view is supportive of the idea that phenomenal consciousness is found in some nonhuman species (presumably most mammals). Nevertheless, he maintains that it may be impossible ever to answer the Distribution Question for more distantly related species; he mentions octopus, pigeons, bees, and slugs in this context.