Robert Schwartz

These essays by Robert Schwartz on topics in the theory of vision are written from a pragmatic perspective. The issues and arguments will interest both philosophers and psychologists, covering new ground and bridging gaps between these disciplines. Schwartz begins historically, with discussions of problems raised and solutions offered in Bishop Berkeley's writings on vision, presenting Berkeley's views on spatial perception and the qualitative aspects of sensory experience in the context of recent theoretical and empirical work in vision theory. Schwartz then turns to debates in both the philosophical and psychological literature over the view that perception is inferential and thus "indirect." Critically surveying competing characterizations of the idea of "inferential processes" he argues the need either to reframe radically the question or drop the issue. Next, Schwartz discusses pictorial representation and research on picture perception. Drawing on the work of Nelson Goodman, Schwartz explains and defends the advantages of a symbolic approach to both topics. Finally, he examines the quagmires that often develop when metaphysical concerns about the "real" and our ability to perceive it infect discussions and claims in the theory of vision. After analyzing issues arising in current psychological research on "object" perception, Schwartz turns to debates over the supposed essential nature of colors. An appreciation of the empirical and theoretical work on color perception suggests that there is no single or privileged analysis of the notion of "real colors." Schwartz circles back in the end to what he calls "that old chestnut of the philosophy of perception"--controversies over "the objects of perception"--and takes an Austinian look at the topic

_Perception_ presents classic essays on the conceptual and theoretical problems in the study of vision. In a style that is accessible to the non-expert, the volume lays out core issues in the theory of vision and then sets up a dialogue on the topics among philosophers and psychologists, past and present. Offers an accessible introduction to perception through key readings. Presents a dialogue among philosophers and psychologists on the science of perception. Contains a comprehensive introduction and provides suggestions for further reading. Useful for readers interested in philosophy, psychology, cognitive science, computer vision, and visual science

At first glance, the first informed consent case to be decided by the High Court of Australia appears to be little more than a clear and simple description of the substantive law accepted in most American jurisdictions - although that is no small accomplishment in and of itself. In Rogers v. Whitaker, the highest court in Australia succinctly and persuasively rejected informed consent as a species of battery law, accepted it as a form, of ordinary professional negligence law, and adopted the “American” patient-oriented standard for measuring the breach of a healthcare professional's duty to her or his patients. On second look, however, the opinion is an even more significant one because it reveals that the law of informed consent is now based on principles broad enough to create a duty on the part of healthcare providers to offer adequate health education to all of their patients. In Implicitly recognizing the physician's duty to educate her or his patients, the High Court's judgment is consistent with a view increasingly held In the medical and ethical communities that teaching patients about how to maintain their health is just as much a part of the doctor's function as diagnosing and treating disease. It may have taken 2,500 years for medicine to progress from, the Hippocratic notion that physicians should apply treatment to patients who are kept in blissful Ignorance of their condition and Its remedy, but there Is little doubt that medicine finally has entered a post-Hippocratic era

In recent papers [1997, in press] I have explored how two seemingly conflicting paradigms inform the conception and study of picture perception. The dominant paradigm, one especially favored by vision theorists, claims that seeing a pictorial representation of an object is, with qualifications, like seeing the object itself. The picture, being a geometrically sanctioned projection of its object, resembles it, or otherwise serves as a mimetic surrogate, “re-presenting” what it depicts [Danto, 1982]. Accordingly, pictorial representation is at its best when, as in trompe l’oeil paintings, viewers can not tell the picture, the stand in or substitute, from the real thing. An alternative paradigm, the symbolic model, championed most forcefully by Nelson Goodman [1968], focuses attention on syntactic and semantic features of pictures. On this account, pictures are importantly allied with other forms of representation, including languages, maps, and music notation, and picture perception is to be understood in this context.

In recent papers [1997, in press] I have explored how two seemingly conflicting paradigms inform the conception and study of picture perception. The dominant paradigm, one especially favored by vision theorists, claims that seeing a pictorial representation of an object is, with qualifications, like seeing the object itself. The picture, being a geometrically sanctioned projection of its object, resembles it, or otherwise serves as a mimetic surrogate, “re-presenting” what it depicts [Danto, 1982]. Accordingly, pictorial representation is at its best when, as in trompe l’oeil paintings, viewers can not tell the picture, the stand in or substitute, from the real thing. An alternative paradigm, the symbolic model, championed most forcefully by Nelson Goodman [1968], focuses attention on syntactic and semantic features of pictures. On this account, pictures are importantly allied with other forms of representation, including languages, maps, and music notation, and picture perception is to be understood in this context.

Roger Shepard's proposals and supporting experiments concerning evolutionary internalized regularities have been very influential in the study of vision and in other areas of psychology and cognitive science. This paper examines issues concerning the need, nature, explanatory role, and justification for postulating such internalized constraints. In particular, I seek further clarification from Shepard on how best to understand his claim that principles of kinematic geometry underlie phenomena of motion perception. My primary focus is on the ecological validity of Shepard's kinematic constraint in the context of ordinary motion perception. First, I explore the analogy Shepard draws between internalized circadian rhythms and the supposed internalization of kinematic geometry. Next, questions are raised about how to interpret and justify applying results from his own and others' experimental studies of apparent motion to more everyday cases of motion perception in richer environments. Finally, some difficulties with Shepard's account of the evolutionary development of his kinematic constraint are considered. Key Words: apparent motion; circadian rhythms; constraints; ecological validity; evolution; internalizated regularities; kinematic principle.

Recently it has been argued that a model of directed perception provides an alternative to both indirect and direct accounts of the nature of vision. An examination of this proposal serves as a basis for challenging the meaningfulness and empirical import of the theoretical and ontological differences said to separate these models. Although focusing on James Cutting's work, the analysis is meant to speak more generally to the supposed significance of the distinctions among indirect, direct, and directed theories of perception