Paul Churchland has recently argued that empirical evidence strongly suggests that perception is penetrable to the beliefs or theories held by individual perceivers (1988). While there has been much discussion of the sorts of psychological cases he presents, little has been said about his arguments from neurology. I offer a critical examination of his claim that certain efferents in the brain are evidence against perceptual encapsulation. I argue that his neurological evidence is inadequate to his philosophical goals, both by itself (...) and taken in concert with his psychological evidence. (shrink)

Criticism of the observation/theory distinction generally supposes it to be an empirical fact that even the most basic human perception is heavily theory-laden. I offer critical examination of experimental evidence cited by Thomas Kuhn and Paul Churchland on behalf of this supposition. I argue that the empirical evidence cited is inadequate support for the claims in question. I further argue that we have empirical grounds for claiming that the Kuhnian discussion of perception is developed within an inadequate conceptual framework and (...) that a version of the observation/theory distinction is indeed tenable. The connection between cognitive science and epistemology is also discussed. (shrink)

A large body of research in computational vision science stems from the pioneering work of David Marr. Recently, Patricia Kitcher and others have criticized this work as depending upon optimizing assumptions, assumptions which are held to be inappropriate for evolved cognitive mechanisms just as anti-adaptationists (e.g., Lewontin and Gould) have argued they are inappropriate for other evolved physiological mechanisms. The paper discusses the criticism and suggests that it is, in part, misdirected. It is further suggested that the criticism leads to (...) interesting questions about how one formulates constraints--across "levels of organization" and disciplinary boundaries--on one's models of complex systems, such as human vision. (shrink)

Block (1995t) has argued for a noncognitive and non- representational notion of phenomenal consciousness, but his putative examples of this phenomenon are conspicuous in their representational and functional properties while they do not clearly possess other phenomenal properties.

A connectionist vehicle theory of consciousness needs to disambiguate its criteria for identifying the relevant vehicles. Moreover, a vehicle theory may appear entirely arbitrary in sorting between what are typically thought of as conscious and unconscious processes.

Various claims for theory-laden perception have involved empirical as well as conceptual considerations. Thomas Kuhn cites New Look psychological research in discussing the role of a paradigm in perception (1970) and Paul Churchland (1988) appeals to biological evidence, as well as New Look sources similar to Kuhn's. This paper offers a critical examination of the empirical evidence cited by Kuhn and Churchland, including a look at the underlying experimental work. It also offers a comment on the application of such evidence (...) in a naturalized epistemology. (shrink)

Of the many controversial claims in Thomas Kuhn’s The Structure of Scientific Revolutions perhaps none are more troublesome than those made in his account of the role of a paradigm in perception. For if we take it that “a paradigm is prerequisite to perception itself (Kuhn 1970, p. 113) and that “two groups of scientists see different things when they look from the same point in the same direction” (Kuhn 1970, p. 150) then we seem to be burdened with all (...) the familiar problems about whether, and how, experimental evidence could possibly serve to promote the acceptance of a paradigm. And, indeed, these problems have been amply discussed in the last several decades. Dudley Shapere, for instance, has questioned Kuhn’s account of how science comes to move between incommensurable paradigms. (Shapere 1964) Still, Kuhn’s discussion of perception has an empirical foundation in psychological research which gives it a certain resilience in the face of surface problems with the consequences of his account. (shrink)