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... following Locke and Kant, I think the introspective awareness is perception-like. For instance, it is very like proprioception, and seems not to involve any linguistic capacity. Perhaps chimpanzees and even dogs have such consciousness." [G. Güzeldere (1995, fn. 22): "Is consciousness the perception of what passes in one's own mind?" In Conscious Experience ed. Thomas Metzinger. Paderborn: Schöningh/Imprint Academic, 1995, fn. 22.]And Lycan, commenting on Carruthers (1998a) in his contribution to the Psyche symposium on animal consciousness writes:
Even if I am right about human beings, of course it does not follow that other animals exhibit a comparable degree of computational complexity. Perhaps some do and some do not; perhaps few if any do. I would continue to maintain that an animal has phenomenal-consciousness in the strong sense if and only if that animal has HOEs [Higher Order Experiences]. So I would at least provisionally conclude that if many animals (including very young human children) lack the computational complexity needed for HOEs, those same many animals lack phenomenal-consciousness in the strong sense. Carruthers would not disagree with that.These are hardly ringing endorsements by higher-order experience theorists for animal consciousness.
2. This argument is very reminiscent of Davidson's (1975) argument against animal thought on the grounds that one must have the concept of thought to be able to think. I am not aware that Davidson was ever tempted to turn this into an argument against animal sentience.
3. See Varner (1999, pp. 51-54) for a discussion of the phylogenetic distribution of the mechanisms underlying pain. However, caution is recommended with respect to his table on p. 53 which suggests that the presence of specialized nociceptive neurons is limited to vertebrates. The existence of nociceptors seems to be well established in marine molluscs. (See E. T. Walters  "Possible clues about the evolution of hyperalgesia from mechanisms of nociceptive sensitization in aplysia." In Hyperalgesia and Allodynia ed.W. D. Willis Jr. New York: Raven Press.)
4. While the locution "feel pain" suggests conscious experience to most readers, it does not do so for all. For instance, Carruthers (1998b) maintains that although animals do in fact feel pain, they do not feel pain consciously - or, as Carruthers somewhat paradoxically puts it, he denies that the feeling feels like anything. Many philosophers would, however, charge that the concept of an unconscious pain is conceptually incoherent, pain being essentially conscious.
5. Because of the
importance of animal sentience to ethics, some of the most explicit
statements of the evolution-reinforced similarity argument can be
found in the animal rights and animal welfare literature (e.g., Singer
1975/1990; Regan 1983; Andrews 1996; Varner 1999).
First published: November 2, 2000
Content last modified: December 4, 2000