Logical Empiricism

Ernst Cassirer’s focus on the expressive function of language should be read, not in the context of Carnap’s debate with Heidegger, but in the context of the earlier work of Chajim (Heymann) Steinthal. Steinthal distinguishes the expressive form of language, when language is studied as a natural phenomenon, from language as a logical, inferential system. Steinthal argues that language always can be expressed in terms of logical inference. Thus, he would disagree with Heidegger, just as Carnap does. But, Steinthal insists, (...) that is not to say that language, as a natural phenomenon, is exhausted by logic or by the place of terms or relations in inferential structures. Steinthal’s “form” of linguistic “expression” is an early version of Cassirer’s “expressive function” for language. The expressive function, then, should not be seen to place a barrier between Carnap and Cassirer. Rather, Steinthal and Cassirer deal with a question that, as far as I know, Carnap does not address directly: how should philosophers analyze human language as a natural phenomenon, as a part of our expression as animals? And how does that expression determine the semantic categories, kind terms, and other structures that develop within, and characterize, human language itself? (shrink)

La característica central del pensamiento filosófico del siglo XX (si más no, de la llamada a día de hoy 'filosofía analítica') ha sido el interés por el estudio del lenguaje. El lenguaje religioso no ha sido una excepción a este interés. Uno de los ejemplos más tempranos de esta preocupación por el estudio del lenguaje religioso es el análisis propuesto por R. B. Braithwaite en su "An Empiricist's View of the Nature of Religious Belief" (1955). Dicho muy brevemente, la idea (...) básica de Braithwaite es que el lenguaje religioso no describe el mundo: aquellos que realizan una afirmación de índole religiosa no están aceptando la verdad de una proposición sino que están simplemente expresando su compromiso con un determinado código de conducta. Es por ello, dice Braithwaite, que adoptar una creencia religiosa no consiste en aceptar que el mundo se corresponde con una descripción de hechos determinada, sino en comprometerse a actuar de acuerdo con un código de conducta. El objetivo de este artículo es ofrecer un análisis crítico de la propuesta de Braithwaite. (shrink)

Due to their acceptance of the verifiability principle, the only way left for logical positivists to argue for the meaningfulness of religious language was to accept some sort of emotivistic conception of it or to reduce it to the description of religious attitude. The verifiability principle, however, suffers from some severe limitations that make it inadequate as a criterion for cognitive meaning. To resolve these problems, logical positivists gave up the requirement of conclusive verifiability and defended a sort of ‘liberalization’ (...) of the verifiability principle. Carnap’s confirmability criterion for cognitive meaning, which is a liberalized form of the verifiability principle, is compatible with an orthodox conception of religious language since, from a theistic perspective, the existence of God can be confirmed through our observational statements. (shrink)

W. V. Quine’s “Two Dogmas of Empiricism”, first published in 1951, is one of the most influential articles in the history of analytic philosophy. It does not just question central semantic and epistemological views of logical positivism and early analytic philosophy, it also marks a momentous challenge to the ideas that conceptual analysis is a main task of philosophy and that philosophy is an a priori discipline which differs in principle from the empirical sciences. These ideas dominated early analytic philosophy, (...) but similar views are to be found in the Kantian tradition, in phenomenology and in philosophical hermeneutics. In questioning this consensus from the perspective of a radical empiricism, Quine’s article has had a sustained and lasting impact across all these philosophical divisions. Quine himself moved from the abandonment of the analytic/synthetic distinction to a thoroughgoing naturalism, and many analytic philosophers have followed his lead. The current collection differs from other anthologies devoted to Quine in two respects. On the one hand, it focuses on his attack on analyticity, apriority and necessity; on the other, it considers implications of that attack that far transcend the limits of Quine scholarship, and lie at the heart of the current self-understanding of philosophy. The contributors include both opponents and proponents of the dichotomies attacked by Quine. Furthermore, they include both eminent figures such as Boghossian, Burge, and Davidson, and up and coming younger philosophers. (shrink)

Die moderne Philosophie steht im Schatten des Skeptizismus: Alle Wissensansprüche scheinen fallibel, alle Theorien nur vorläufig, alle Gewissheiten nur temporär zu sein. In dieser gespannten Situation ist die Versuchung groß, das Wesen des vernünftigen Denkens in der Form zu suchen. Vernunft gilt dann als ein allgemeines Vermögen, das bei wechselnden Inhalten seine kritische Kompetenz bewahrt. Doch solche Formalismen müssen scheitern: Wer Erfahrung nur als «Wahrnehmung» oder «Gehalt» adressiert, übergeht die dynamische und überschreitende Natur alles Erfahrens, ohne die Denken und Wissen (...) nicht zu haben sind. -/- In dieser Studie wird gezeigt, dass der Pragmatismus von Peirce und Dewey als eine Philosophie der Erfahrung gelesen werden muss, die eine effektive Kritik der formalen Vernunft formuliert. Dabei bettet sie diese Philosophie in den weiteren Kontext der philosophischen Diskussion des 20. Jahrhunderts ein, in dem der Logische Empirismus und die postanalytische Philosophie auf die dynamische Natur des Wissens reflektieren. Die Frage nach der Erfahrung, so zeigt sich, ist selbst eine Reflexion auf die geschichtliche Erfahrung einer kontingenten Moderne. (shrink)

The aim of this paper is to show that a comprehensive account of the role of representations in science should reconsider some neglected theses of the classical philosophy of science proposed in the first decades of the 20th century. More precisely, it is argued that the accounts of Helmholtz and Hertz may be taken as prototypes of representational accounts in which structure preservation plays an essential role. Following Reichenbach, structure-preserving representations provide a useful device for formulating an up-to-date version of (...) a (relativized) Kantian a priori. An essential feature of modern scientific representations is their mathematical character. That is, representations can be conceived as (partially) structure-preserving maps or functions. This observation suggests an interesting but neglected perspective on the history and philosophy of this concept, namely, that structure-preserving representations are closely related to a priori elements of scientific knowledge. Reichenbach’s early theory of a relativized constitutive but non-apodictic a priori component of scientific knowledge provides a further elaboration of Kantian aspects of scientific representation. To cope with the dynamic aspects of the evolution of scientific knowledge, Cassirer proposed a re-interpretation of the concept of representation that conceived of a particular representation as only one phase in a continuous process determined by pragmatic considerations. Pragmatic aspects of representations are further elaborated in the classical account of C.I. Lewis and the more modern of Hasok Chang. (shrink)

Historically, the Vienna Circle and the Dessau Bauhaus were related, with members of each group familiar with the ideas of the other. Peter Galison argues that their projects are related as well, through shared political views and methodological approach. The two main figures that connect the Vienna Circle to the Bauhaus—and the figures upon which Galison focuses—are Rudolf Carnap and Otto Neurath. Yet the connections that Galison develops do not properly capture the common themes between the Bauhaus and Neurath’s philosophical (...) projects. We demonstrate this by considering Neurath’s philosophical commitments. We suggest different connections between Neurath’s projects and the Bauhaus, connections that are both substantive and philosophically interesting. (shrink)

Many who take a dismissive attitude towards metaphysics trace their view back to Carnap’s ‘Empiricism, Semantics and Ontology’. But the reason Carnap takes a dismissive attitude to metaphysics is a matter of controversy. I will argue that no reason is given in ‘Empiricism, Semantics and Ontology’, and this is because his reason for rejecting metaphysical debates was given in ‘Pseudo-Problems in Philosophy’. The argument there assumes verificationism, but I will argue that his argument survives the rejection of verificationism. The root (...) of his argument is the claim that metaphysical statements cannot be justified; the point is epistemic, not semantic. I will argue that this remains a powerful challenge to metaphysics that has yet to be adequately answered. (shrink)

Ernst Cassirer, 2011, Symbolische Prägnanz, Ausdrucksphänomen und „Wiener Kreis“, Nachgelassene Manuskripte und Texte, vol. 4, ed. Christian Möckel, 478pp., Hamburg, Felix Meiner Verlag.

In this paper, I discuss Eino Kaila's (1890-1958) understanding of David Hume. Kaila was one of the leading Finnish philosophers of the 20th century and a correspondent of the Vienna Circle. He introduced logical empiricism into Finland and taught Georg Henrik von Wright. Final draft.

The paper - originally a lecture in the "40th Anniversary Lecture Series 2001-2002" of the University of Pittsburgh (attached to the Italian text)- gives a survey of the development of philosophy of science in Germany and of the role tthe Pittsburgh Center for Philosophy of Science plays in this development.

Walter Dubislav (1895–1937) was a leading member of the Berlin Group for scientific philosophy. This “sister group” of the more famous Vienna Circle emerged around Hans Reichenbach’s seminars at the University of Berlin in 1927 and 1928. Dubislav was to collaborate with Reichenbach, an association that eventuated in their conjointly conducting university colloquia. Dubislav produced original work in philosophy of mathematics, logic, and science, consequently following David Hilbert’s axiomatic method. This brought him to defend formalism in these disciplines as well (...) as to explore the problems of substantiating (Begründung) human knowledge. Dubislav also developed elements of general philosophy of science. Sadly, the political changes in Germany in 1933 proved ruinous to Dubislav. He published scarcely anything after Hitler came to power and in 1937 committed suicide under tragic circumstances. The intent here is to pass in review Dubislav’s philosophy of logic, mathematics, and science and so to shed light on some seminal yet hitherto largely neglected currents in the history of philosophy of science. (shrink)

Die Berliner Gruppe um Hans Reichenbach, Kurt Lewin, Walter Dubislav, Alexander Herzberg, Kurt Grelling und Carl Gustav Hempel, die die »Gesellschaft für wissenschaftliche Philosophie« in Berlin leitete, verstand sich als gleichberechtigter Partner der Wiener Kollegen und schlug durchaus einen eigenständigen Weg zu »einer an der exakten Wissenschaft geschulten Philosophie« (Reichenbach) ein. Im öffentlichen und geistigen Leben der deutschen Hauptstadt spielte sie eine bedeutende Rolle, bevor ihre Mitglieder durch den Nationalsozialismus ins Exil gezwungen wurden. Nach ihrer Emigration haben Reichenbach, Hempel und (...) andere für die Entwicklung der analytischen Philosophie und der modernen Wissenschaftstheorie im angelsächsischen Sprachraum eine bedeutende Rolle gespielt. Der Band fasst erstmals in einer repräsentativen Auswahl die Texte der Berliner Gruppe in einer Anthologie zusammen und zeigt die Bedeutung und die Einheitlichkeit der Gruppe als – neben dem Wiener Kreis – zweitem Entstehungsort exakter Philosophie. (shrink)

Philosophy of science and history of science both have a significant relation to science itself; but what is their relation to each other? That question has been a focal point of philosophical and historical work throughout the second half of this century. An analysis and review of the progress made in dealing with this question, and especially that made in philosophy, is the focus of this thesis. Chapter one concerns logical positivist and empiricist approaches to philosophy of science, and the (...) significance of the criticisms levelled at them by analytic epistemologists such as Willard Quine and 'historicist' philosophers, especially Thomas Kuhn. Chapter two details the attempts by Kuhn and Lakatos to integrate these historicist criticisms with historically oriented philosophy of science, in their separate attempts at providing rational explanations of historical developments. Kuhn's latest work seeks to mend fences with philosophy, but his efforts remain too closely tied to the epistemological approaches strongly criticized in his earlier work. Lakatos' treatment of history is much more subtle than most have understood it to be, but the conception of scientific rationality that arises out of it is transformed into an abstract cultural product, more reminiscent of Hegel's geist than of individual human rationality. Chapters three and four discuss the recommendations of Lakatos and Laudan to historians with regard to historiography, and the actual historiographies and philosophy of history of practicing historians and historians of science. The philosophers' contributions indicate little concern for the historians' own methods, materials, and purposes; and the historians' writings present methodologies for history of science that are independent of the normative demarcations of philosophy of science, pace Lakatos and Laudan. Chapter five develops a philosophical position that fosters a more productive engagement between philosophy and history of science, a 'methodological historicism' that embraces the possibility of an important role for social and political factors in a philosophical study of scientific development. The epistemological relativism that might accompany such a historicist position need not be the radical epistemological anarchism of Feyerabend, though it will allow for a significant underdetermination of scientific development by reason nonetheless. (shrink)

Carnap’s Ideal of Explication and Naturalism is the second book on Rudolf Carnap’s philosophy edited by Pierre Wagner for Palgrave Macmillan’s series The History of Analytic Philosophy. The collection of essays is important for several reasons both for philosophers and historians of philosophy, but some parts of it will also be valuable to anyone interested in general scientific methodologies. I shall first survey the theme in order to locate the collection within the recent philosophical discussion then I will consider the (...) volume itself. (shrink)

Abstract: The paper argues that mainstream economics and mainstream philosophy of natural science had much in common during the period 1945-1965. It examines seven common features of the two fields and suggests a number of historical developments that might help explain these similarities. The historical developments include: the Vienna Circle connection, the Samuelson-Harvard-Foundations connection, and the Cold War operations research connection.

Estudios de filosofía contemporánea, lleva por título este volumen que reúne varios trabajos del Prof. Ricardo Navia, algunos publicados previamente en revistas especializadas de Brasil y Perú, otros que se editan por primera vez. No obstante tratarse de artículos independientes, la obra presenta continuidad temática en torno a problemas de teoría del conocimiento, filosofía del lenguaje y metafilosofía, especialmente centrados en la filosofía de la segunda mitad del siglo XX.

This paper outlines the intellectual biography of Walter Dubislav. Besides being a leading member of the Berlin Group headed by Hans Reichenbach, Dubislav played a defining role as well in the Society for Empirical/Scientific Philosophy in Berlin. A student of David Hilbert, Dubislav applied the method of axiomatic to produce original work in logic and formalist philosophy of mathematics. He also introduced the elements of a formalist philosophy of science and addressed more general problems concerning the substantiation of human knowledge. (...) What set Dubislav apart from the other logical empiricists was his expertise in the history of logic and exact philosophy which enabled him to elucidate and advance the thinking in both disciplines. In the realm of logic proper, Dubislav is best known for his pioneering work in theory of definitions. What is more, he did original work on the so called ‘quasi truth-tables’ which aided Reichenbach in developing his logic of probability. Dubislav also elaborated an influe.. (shrink)

Die vorliegende Schrift unternimmt eine Revision des vorherrschenden Bildes der Rolle und der Konzeptionen von Moral und Ethik im Wiener Kreis. Dieses Bild wird als zu einseitig und undifferenziert zurückgewiesen. Die Ansicht, die Mitglieder des Wiener Kreises hätten kein Interesse an Moral und Ethik gezeigt, wird widerlegt. Viele Mitglieder waren nicht nur moralisch und politisch interessiert, sondern auch engagiert. Des Weiteren vertraten nicht alle die Standardauffassung logisch-empiristischer Ethik, die neben der Anerkennung deskriptiv-empirischer Untersuchungen durch die Ablehnung jeglicher normativer und inhaltlicher (...) Ethik und der Verfechtung eines extremen Nonkognitivismus geprägt ist. Am meisten entspricht die Standardauffassung den Ansichten Rudolf Carnaps, weniger bereits jenen Karl Mengers, Otto Neuraths oder Philipp Franks. Am weitesten weichen Moritz Schlick, Victor Kraft sowie Herbert Feigl von der Standardauffassung ab. Entgegen dem herkömmlichen Bild weltabgewandter Logiker und Metaethiker wurde im Wiener Kreis sogar Angewandte Ethik betrieben, und dies bereits unter diesem Namen. Neben den ethischen Hauptthemen und Ansichten der jeweiligen Philosophen in ihrer Entwicklung im Rahmen ihres persönlichen und kulturellen Kontextes zeigt die Untersuchung, dass allen Ansätzen eine aufgeklärte und humanistische Version von Moral und Ethik gemeinsam ist. Dieser wissenschaftliche Humanismus, der sich schon in der Programmschrift Wissenschaftliche Weltauffassung. Der Wiener Kreis findet, liegt jedoch in verschiedenen Ausprägungen vor. Was die Abweichungen von der Standardauffassung wesentlich betrifft, ist ihre unterschiedliche Auffassung von Moral als gemeinsames oder individuelles Unternehmen. Carnap führt ein extremer Individualismus zu einem extremen Nonkognitivismus, in dem ihm Menger folgt. Bei Schlick ist die Lage zweideutig, was sich in unterschiedlichen Moralbegriffen widerspiegelt. Bei Kraft und Feigl tritt das Verständnis von Moral als gemeinschaftlich geteilte Praxisform klar hervor. Auf der Basis eines gemeinsamen Begriffs des moralisch Guten, der auch eine Sachkomponente enthält, ist eine Verständigung über moralische Fragen möglich. Von einem extremen Nonkognitivismus kann dort nicht mehr die Rede sein. Mit diesen Ergebnissen verbietet es sich, dem Wiener Kreis allgemein eine Ablehnung normativer Ethik und einen extremen Nonkognitivismus zuzuschreiben. Eine systematische Ethik, die Moral als Gemeinschaftspraxis begreift, steht einigen im Wiener Kreis näher, als das vorherrschende Bild suggerieren möge. Wer meint, mit engem Bezug zur Tradition des Wiener Kreises nur Carnap folgen zu können und Ethik als suspektes Unternehmen betrachten zu müssen, irrt. Ethik war in der Tradition Analytischer Philosophie nicht immer so marginalisiert, wie sie es in manchen ihrer Teilrichtungen heute noch ist und Gegner(innen) der Analytischen Philosophie vorwerfen. Die vorliegende Untersuchung liefert die nötige Revision einer verfänglichen Fehlentwicklung. (shrink)

Grice and Strawson's 'In Defense of a Dogma is admired even by revisionist Quineans such as Putnam (1962) who should know better. The analytic/synthetic distinction they defend is distinct from that which Putnam successfully rehabilitates. Theirs is the post-positivist distinction bounding a grossly enlarged analytic. It is not, as they claim, the sanctified product of a long philosophic tradition, but the cast-off of a defunct philosophy - logical positivism. The fact that the distinction can be communally drawn does not show (...) that it is based on a real difference. Subcategories that can be grouped together by enumeration will do the trick. Quine's polemical tactic (against which Grice and Strawson protest) of questioning the intelligibility of the distinction is indeed objectionable, but his argument can be revived once it is realized that 'analytic' et al. are theoretic terms, and there is no extant theory to make sense of them. Grice and Strawson's paradigm of logical impossibility is, in fact, possible. Their attempt to define synonymy in Quinean terms is a failure, nor can they retain analyticity along with the Quinean thesis of universal revisability. The dogma, in short, is indefensible. (shrink)

This article discusses the relation between the early Wittgenstein’s and Carnap’s philosophies of logic, arguing that Carnap’s position in The Logical Syntax of Language is in certain respects much closer to the Tractatus than has been recognized. In Carnapian terms, the Tractatus’ goal is to introduce, by means of quasi-syntactical sentences, syntactical principles and concepts to be used in philosophical clarification in the formal mode. A distinction between the material and formal mode is therefore already part of the Tractatus’ view, (...) and its method for introducing syntactical concepts and principles should be entirely acceptable for Carnap by his own criteria. Moreover, despite the Tractatus’ rejection of syntactical statements, there is an important correspondence between Wittgenstein’s saying-showing distinction and Carnap’s object-language-syntax-language distinction: both constitute a distinction between logico-syntactical determinations concerning language and language as determined or described by those determinations. Wittgenstein’s distinction therefore constitutes a precursor of the object-language syntax-language distinction which the latter in a certain sense affirms, rather than simply contradicting it. The saying-showing distinction agrees with Carnap’s position also in marking logic as something that isn’t true/false about either language or reality, which is a conception that underlies Carnap’s principle of tolerance. (shrink)

The received view in the history of the philosophy of psychology is that the logical positivists—Carnap and Hempel in particular—endorsed the position commonly known as “logical” or “analytical” behaviourism, according to which the relations between psychological statements and the physical-behavioural statements intended to give their meaning are analytic and knowable a priori. This chapter argues that this is sheer legend: most, if not all, such relations were viewed by the logical positivists as synthetic and knowable only a posteriori. It then (...) traces the origins of the legend to the logical positivists’ idiosyncratic extensional or at best weakly intensional use of what are now considered crucially strongly intensional semantic notions, such as “translation,” “meaning” and their cognates, focussing on a particular instance of this latter phenomenon, arguing that a conflation of explicit definition and analyticity may be the chief source of the legend. (shrink)

Recently, Michael Friedman has claimed that virtually all the seeds of Hempel’s philosophical development trace back to his early encounter with the Vienna Circle (Friedman 2003, 94). As opposed, however, to Friedman’s view of the principal early influences on Hempel, we shall see that those formative influences originated rather with the Berlin Group. Hempel, it is true, spent the fall term of 1929 as a student at the University of Vienna, and, thanks to a letter of recommendation from Hans Reichenbach, (...) he even attended some sessions of the Vienna Circle. But he spent much less time in Vienna than in Berlin, where he studied under Reichenbach from 1926 till 1933 and wrote a dissertation on probability, Reichenbach’s specialty. Hempel also attended seminars conducted by Walter Dubislav, another member of the Berlin Group. (shrink)

The Berlin Group was an equal partner with the Vienna Circle as a school of scientific philosophy, albeit one that pursued an itinerary of its own. But while the latter presented its defining projects in readily discernible terms and became immediately popular, the Berlin Group, whose project was at least as sig-nificant as that of its Austrian counterpart, remained largely unrecognized. The task of this chapter is to distinguish the Berliners’ work from that of the Vienna Circle and to bring (...) to light its impact in the history of scientific philosophy. (shrink)

The Berlin Group for scientific philosophy was active between 1928 and 1933 and was closely related to the Vienna Circle. In 1930, the leaders of the two Groups, Hans Reichenbach and Rudolf Carnap, launched the journal Erkenntnis. However, between the Berlin Group and the Vienna Circle, there was not only close relatedness but also significant difference. Above all, while the Berlin Group explored philosophical problems of the actual practice of science, the Vienna Circle, closely following Wittgenstein, was more interested in (...) problems of the language of science. The book includes first discussion ever (in three chapters) on Walter Dubislav’s logic and philosophy. Two chapters are devoted to another author scarcely explored in English, Kurt Grelling, and another one to Paul Oppenheim who became an important figure in the philosophy of science in the USA in the 1940s–1960s. Finally, the book discusses the precursor of the Nord-German tradition of scientific philosophy, Jacob Friedrich Fries. Mehr anzeigen Weniger anzeigen . (shrink)

This article distinguishes between Machian empiricism and the logical positivism of the Vienna Circle and associated philosophers. Mach's natural philosophy was a first order attempt to reform and reorganize physics, not a second order reconstruction of the "language" of physics. Mach's elements were not sense data but realistic events in the natural world and in minds, and Mach admitted unobserved elements as part of his world view. Mach's critique of metaphysics was far more subtle and concerned the elimination of sensory (...) visual imagery from natural science, leaving only concrete elements and functions, very much an inspiration to the young Einstein and Heisenberg and a useful engine of theory construction in physics. (shrink)

Karl Popper has often been cast as one of the most solitary figures of twentieth-century philosophy. The received image is of a thinker who developed his scientific philosophy virtually alone and in opposition to a crowd of brilliant members of the Vienna Circle. This paper challenges the received view and undertakes to correctly situate on the map of the history of philosophy Popper’s contribution, in particular, his renowned fallibilist theory of knowledge. The motive for doing so is the conviction that (...) the mainstream perspective on Popper’s philosophy makes him more difficult to understand than might otherwise be the case. The thinker who figures most significantly in the account of Popper developed in these pages is Leonard Nelson. Both a neo-Friesian and neo-Kantian, this philosopher deeply influenced Popper through his student Julius Kraft, who met with Popper on numerous occasions in the mid 1920s. It is in the light of this influence that we understand Popper’s recollection that when he criticized the Vienna Circle in the early 1930s, he looked upon himself “as an unorthodox Kantian”. (shrink)

This paper considers George A. Reisch’s account of the role of Cold War political forces in shaping the apolitical stance that came to dominate philosophy of science in the late 1940s and 1950s. It argues that at least as early as the 1930s, Logical Empiricists such as Rudolf Carnap already held that philosophy of science could not properly have political aims, and further suggests that political forces alone cannot explain this view’s rise to dominance during the Cold War, since political (...) forces cannot explain why a philosophy of science with liberal democratic, anti-communist aims did not flourish. The paper then argues that if professionalization is understood in the right way, it might point toward an explanation of the apolitical stance of Cold War philosophy of science. (shrink)

The identity theory’s rise to prominence in analytic philosophy of mind during the late 1950s and early 1960s is widely seen as a watershed in the development of physicalism, in the sense that whereas logical behaviourism proposed analytic and a priori ascertainable identities between the meanings of mental and physical-behavioural concepts, the identity theory proposed synthetic and a posteriori knowable identities between mental and physical properties. While this watershed does exist, the standard account of it is misleading, as it is (...) founded in erroneous intensional misreadings of the logical positivists’—especially Carnap’s—extensional notions of translation and meaning, as well as misinterpretations of the positivists’ shift from the strong thesis of translation-physicalism to the weaker and more liberal notion of reduction-physicalism that occurred in the Unity of Science programme. After setting the historical record straight, the essay traces the first truly modern identity theory to Schlick’s pre-positivist views circa 1920 and goes on to explore its further development in Feigl, arguing that the fundamental difference between the Schlick-Feigl identity theory and the more familiar and influential Place-Smart-Armstrong identity theory has resurfaced in the deep and seemingly unbridgeable gulf in contemporary philosophy of consciousness between inflationary mentalism and deflationary physicalism. (shrink)