Thomas Kuhn and Perspectival Realism a Thesis Presented to The
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Thomas Kuhn and Perspectival Realism A thesis presented to the faculty of the College of Arts and Sciences of Ohio University In partial fulfillment of the requirements for the degree Master of Arts Ryan J. O'Loughlin April 2017 © 2017 Ryan J. O'Loughlin. All Rights Reserved. 2 This thesis titled Thomas Kuhn and Perspectival Realism by RYAN J. O'LOUGHLIN has been approved for the Department of Philosophy and the College of Arts and Sciences by Philip Ehrlich Professor of Philosophy Robert Frank Dean, College of Arts and Sciences 3 ABSTRACT O'LOUGHLIN, RYAN J., M.A., April 2017, Philosophy Thomas Kuhn and Perspectival Realism Director of Thesis: Philip Ehrlich In this paper I discuss Giere’s reading of Kuhn as affirming perspectival realism and I present evidence demonstrating that this reading of Kuhn is correct. I consider several scientific realist theses that Kuhn rejects and discuss whether and to what extent perspectival realism may be regarded as a scientific realist position. I suggest adding Kuhn’s account of incommensurability, understood in its later form, to Giere’s account of perspectival realism. I conclude by providing a definition of perspectival realism that incorporates Kuhn’s incommensurability thesis as well as the specific claims of scientific realism that are compatible with perspectival realism. Perspectival realism thus understood is, at most, a weak form of scientific realism. 4 TABLE OF CONTENTS Page Abstract ............................................................................................................................... 3 1. Introduction ..................................................................................................................... 5 2. Giere’s Scientific Perspectivism ..................................................................................... 8 2.1 Color Science ............................................................................................................ 8 2.2 Observational Perspectives ..................................................................................... 12 2.3 Theoretical Perspectives ......................................................................................... 14 2.4 Some Problems for Perspectival Realism ............................................................... 17 3. Kuhn as a Perspectival Realist ...................................................................................... 22 3.1 Kuhn and Perspectivism ......................................................................................... 22 3.2 Kuhn and Realism ................................................................................................... 23 3.3 Hoyningen-Huene on Perspectival Realism ........................................................... 26 4. Lexicons and Perspectives ............................................................................................ 28 4.1 Lexicons as Theoretical Perspectives ..................................................................... 28 4.2 Incommensurability ................................................................................................ 35 5. Perspectival Realism is Not Scientific Realism ............................................................ 41 5.1 Kuhn is Not a Scientific Realist .............................................................................. 41 5.2 Massimi and Alethic Relativism ............................................................................. 47 5.3 Giere, Perspectival Realism, and Objective Realism ............................................. 49 6. Conclusion .................................................................................................................... 53 References ......................................................................................................................... 55 5 1. INTRODUCTION It is well known that Thomas Kuhn’s The Structure of Scientific Revolutions (1962) sparked a considerable degree of controversy and debate in both the scientific and philosophical communities. While Kuhn spent much of his career responding to charges of relativism—such as Imre Lakatos’ critique that Kuhn made theory choice a matter of “mob psychology” (Lakatos, 1970)—and other issues raised by his critics, his later views on the topic of realism have received comparatively little attention. Recently Ronald Giere has argued that Kuhn’s later views on realism, such as those expressed in the essays included in The Road Since Structure (Kuhn 2000; hereafter, RSS), can be regarded as affirming perspectival realism. Giere avoids drawing a comparison between perspectives and the paradigms of Kuhn’s The Structure of Scientific Revolutions (henceforth: Structure) and instead focuses on Kuhn’s later development of lexical taxonomies or lexicons within scientific communities. As Giere notes, “By the time most of the essays in RSS were written, Kuhn himself had ceased talking about paradigms, preferring instead the more explicitly linguistic notion of a theoretical lexicon” (2013, 53). While Giere’s retrospective interpretation1 is brief, he makes a case for why Kuhn may be regarded as a perspectivist, why Kuhn is a realist of some sort, and thus why Kuhn may be regarded as a perspectival realist. What perspectival realism entails, and the extent to which it is a realist position, will both be considered in greater detail below, in 1 Giere makes it clear that he doesn’t “mean to imply that Kuhn himself ever held, or even contemplated, such a view” (2013, 53). 6 sections 2 and 5 respectively. However, Giere offers the following summary of perspectival realism in Giere (2013) that will suffice as a starting point: “some claims generated by scientific practice are claims about the world…that is the realism part. Second, these claims are not unconditional, but relative to a set of humanly constructed concepts…That is the perspectival part” (2013, 53). In what follows I will bolster Giere’s claim that Kuhn may be regarded as a perspectival realist while challenging the idea that perspectival realism is a scientific realist position in any substantive sense, despite its name. Specifically, in section 2 I will outline Giere’s account of perspectivism and perspectival realism and challenge some of his central claims. I will also take into consideration some critiques of perspectivism offered by Anjan Chakravartty in (Chakravartty, 2010). In Section 3 I will outline Giere’s claim that Kuhn may be regarded as a perspectival realist, taking into account the similar conclusion reached by Paul Hoyningen-Huene (2012). In section 4, by focusing both on Kuhn’s essays in RSS and some of the secondary literature, I will argue that it is correct to regard the later Kuhn as a perspectivist. Additionally, I will argue that the identification of Kuhn’s later views as affirming perspectivism provides a clearer picture of what perspectivism entails when added to Giere’s account. In section 5 I will argue that Kuhn should not be regarded as a scientific realist if ‘scientific realism’ is to be understood in anything like the familiar way in which it is standardly used. By considering several theses of realism I will argue that Kuhn and Giere, as perspectivists, should not be regarded as scientific realists. However, identifying Kuhn as a perspectival 7 realist allows us to clearly formalize the central claims/commitments of perspectival realism. 8 2. GIERE’S SCIENTIFIC PERSPECTIVISM In his book, Scientific Perspectivism (2006), Giere sets out to synthesize two opposing views regarding the truth-status of scientific claims: objectivism and social constructivism. Objectivism, which can be thought of as a strict scientific realism, is the position that scientific claims are true or approximately true and scientific knowledge is thus knowledge regarding the objective matters of fact about the world. In contrast, social constructivism is the thesis that scientific claims are not true claims about the world and scientific knowledge is really just a consensus reached by scientists within the scientific community. Giere’s synthesis of these two disparate viewpoints is “a version of perspectivism… [and] mediates between the strong objectivism of most scientists, or the hard realism of many philosophers of science, and the constructivism found largely among historians and sociologists of science” (Giere 2006, 3). Giere begins his discussion of perspectivism by focusing on color science, so I will begin by outlining his main points on this topic. 2.1 Color Science Giere discusses color science, in order to demonstrate how subjective and objective components interact in scientific observation, by focusing on how our understanding of color is best understood as an interaction between the human visual system and the environment. We perceive things as colored because light reflects off of objects and travels to our eyes with a given wavelength. Different wavelengths are perceived as different colors. Part of the reason objects appear colored is thus due to the wavelengths of light that reflect off of these objects. Light reflects off of different 9 surfaces based on their molecular structure, and the characterization of how a given surface will reflect light is called the spectral reflectance of that surface. Since the spectral reflectance of different surfaces can be accounted for based on optical science, one could argue that an objective account of colors can be given: “In principle, a specification of the molecular structure of a surface