  This particular claim has drawn a great deal of criticism. Siegel (2004) argues that Martin’s account fails to accommodate the different kinds of hallucinations that can be experienced by a creature who lacks the conceptual capacities to make introspective judgements about its experience. E.g., suppose a dog is having a hallucination. Due to conceptual incapacities the dog is not in position to know that he is not perceiving a tomato, so for the dog this experience is introspectively indiscriminible from a perception of a tomato. However, from this fact alone it does not follow that the dog is having a hallucination of a tomato.