  Various objections have been raised against Martin’s proposal. Some object to Martin’s suggestion that being subjectively indiscriminible from a genuine perception is a sufficient condition for being a perceptual experience. Siegel (2004 and 2008), Hawthorne and Kovakovich (2006), Smith (2008), and Byrne and Logue (2008) push this line of objection. In effect, such objectors may be seen as attempting to meet one of Martin’s challenges by offering reason to think that our notion of perceptual experience is, after all, more restrictive than the epistemically characterised one he proposes. Siegel objects that a cognitively unsophisticated creature, such as a dog, will be incapable of introspectively discriminating the experiences they have. So we cannot appeal to the notion of subjective indiscriminability in our account of what makes it the case that the dog has a perceptual experience of an F. Byrne and Logue (2008) and Smith (2008) object that even in the case of a cognitively sophisticated subject we should not rule out the possibility of the occurrence of a conscious mental event that is not a perceptual experience, but which is subjectively indiscriminible from a veridical perception. For example, it might be argued that we should deny that episodes of perceptual imagining (e.g., visualising) are perceptual experiences, and we should allow that it may be possible for an episode of visualising to be subjectively indiscriminible from a veridical perception. One might think that just such episodes occur when one is dreaming. (For example, see Ichikawa 2009). Keith Allen (2015), on the other hand, argues that hallucinations are degenerate kinds of sensory imagination and that the view that hallucination is a kind of sensory imagination represents a promising account of hallucination from the perspective of a naïve realist theory of perception like naïve realism.