Kurt Gödel criticizes Rudolf Carnap's conventionalism on the grounds that it relies on an empiricist admissibility condition, which, if applied, runs afoul of his second incompleteness theorem. Thomas Ricketts and Michael Friedman respond to Gödel's critique by denying that Carnap is committed to Gödel's admissibility criterion; in effect, they are denying that Carnap is committed to any empirical constraint in the application of his principle of tolerance. I argue in response that Carnap is indeed committed to an empirical requirement vis‐à‐vis (...) tolerance, a fact that becomes clear upon closer scrutiny of Carnap's relevant writings. *Received July 2009; revised January 2010. †To contact the author, please write to: Department of Philosophy, University of Saskatchewan, 9 Campus Drive, Saskatoon, SK S7N 5A5, Canada; e‐mail: [email protected]. (shrink)

Uebel has recently claimed that, contrary to popular opinion, none of the philosophers of the Vienna Circle of Logical Positivists were proponents of epistemological foundationalism. According to the considerations of the current discussion, however, Uebel's conclusion is erroneous, especially with respect to the work of Moritz Schlick. The chief reason Uebel offers to support his conclusion is that current attempts to portray Schlick's epistemology as foundationalist fail to overcome its ‘ultimate incoherence’. In contrast, it is argued that current interpretations, based (...) on the unpublished as well as the published record, provide understandings of Schlick's foundationalist epistemology as not only coherent, but plausible. In closing, Uebel's own treatment of Schlick's work, which purports to show that the most feasible candidates for foundational statements are ‘meaning-theoretic’ clarifications of the content of expressions, itself fails to accurately represent Schlick's own characterizations, and pictures Schlick's epistemology as a confused mix of epistemic and semantic insights. (shrink)

Paul Feyerabend once made a remark to the effect that his pragmatic theory of observation can be traced back to proposals put forward by leading Logical Empiricists during the height of the protocol sentence debate. In this paper I want to vindicate the systematic side of Feyerabend’s remark and show that a pragmatic theory of observation can in fact be found in Rudolf Carnap’s writings of 1932. I first proceed to dispel a misunderstanding concerning the term “pragmatic” raised by Thomas (...) Oberdan. Following Morris’ and Carnap’s documented usage, I show that the intended meaning of “pragmatic” refers to a specific semiotic relation between users of a language and their environment describable by empirical means. I reconstruct such a pragmatic theory in terms of a detector model that interprets observation sentences as bodily dispositions indicating physical events in the surroundings of the detector. I then proceed to show how Feyerabend’s later theory of observation picks up central features of Carnap’s account and also shares some of the motivations. I conclude by noting how an empirical theory of observation sentences offers a bootstrapping solution to the “basis problem”. (shrink)

In the 1930s, Carnap set out to incorporate psychology into the unity of science, by showing that all cognitively meaningful sentences of psychology can be translated into the language of physics. I will argue that Carnap, relying on his notion of protocol languages, defends a physicalistic philosophy of psychology that shows due appreciation to 'introspection' as a strictly subjective, but reliable way to verify sentences about one’s own mind. Second, I will point out that Carnap’s philosophy of psychology not only (...) takes into account overt behaviour, but must comprise neurophysiological processes as well. Last, I will show that Carnap aims to develop a philosophy of psychology that does justice to the ongoing changeability of scientific knowledge. (shrink)

Rudolf Carnap’s contributions to the Paris 1935 Congress for scientific philosophy signal three important changes in his philosophy: his semantic turn; what would later be called the “liberalization of empiricism”; and his adoption of the so-called thing language as a basis for the language of science. This paper examines this third change. In particular, it considers Carnap’s motivation for adopting the thing language as the protocol language of unified science and the virtues of the thing language in comparison with other (...) types of protocol language. (shrink)

Aujourd’hui, bon nombre de philosophes des sciences ou d’universitaires semblent penser que leur expertise peut éclairer les débats publics. Le premier empirisme logique peut apparaître comme un modèle de philosophie des sciences politiquement pertinent. Dans ses travaux sur la « dépolitisation» de l’empirisme logique, George Reisch a aidé à prendre conscience de l’agenda politique (de certaines composantes) du Cercle de Vienne, agenda qui a disparu dans les États-Unis d’après-guerre, sous la pression de l’anti-communisme. L’étude du cas d’Edgar Zilsel, un sociologue (...) des sciences membre de l’aile gauche radicale du Cercle de Vienne, montre cependant que l’empirisme logique ne peut pas être considéré aussi facilement comme politique. Certes, Zilsel était un intellectuel politiquement engagé, mais il n’était pas un philosophe des sciences politiquement engagé: son intention n’était pas d’intervenir dans les débats publics ou de soutenir des causes publiques en vertu de son statut académique (il n’en avait pas) ou de son expertise professionnelle (il en avait une). Je soutiens en outre que les débats contemporains sur la place de la science dans la société, menés par des universitaires qui, soucieux de leur impact sur les questions de société, conceptualisent l’influence sociale en termes de motifs et de valeurs individuels, ne correspondent pas au point de vue des empiristes logiques de gauche: ceux-ci cherchaient à fournir une explication sociologique de la science et s’attachaient davantage aux déterminants structuraux qu’aux motifs individuels. Ainsi, même si l’empirisme logique peut être vu comme un modèle de philosophie des sciences politiquement pertinent, il pointe, à mon sens, dans une direction différente de celle généralement prise par ses héritiers d’aujourd’hui. (shrink)