 Aristotle, considering a version of the HOP theory, argued that the view suffered from a regress problem since the higher-order perception must itself be conscious and so be accompanied by a HOP, which would itself be conscious, and so on (De Anima 3.2; Caston 2002). The standard way to diffuse such a worry is to deny that the higher order state, be it perception or thought, need be conscious. An alternative, of course, is to endorse a self-representational account. There are other objections to higher order views, however, each of which applies to one or more versions of the view. They include worries about the possibility of objectless and non-veridical higher order states (Byrne 1997; Block 2011), about whether it can account for the conscious states of infants and non-humans (Dretske 1995: ch. 4; Tye 1995: ch. 1), the complaint that the postulation of a distinct higher-order state for every conscious state leads to an unnecessarily “cluttered picture of the mind” (Chalmers 1996: 231), and the fundamental worry that no form of higher-order view has the resources to explain consciousness at all (Levine 2006; cf. Kriegel 2012). As such, higher-order and self-representational theories of consciousness, that posit a necessary connection between consciousness and self-consciousness, are far from being established.