Iceland has not been known as a contributor to the history of science. This small nation in the North-Atlantic has only in recent decades made its mark on international science. But the Icelandic naturalist Thorvaldur Thoroddsen (1855-1921) is an exception to this generalisation, for he was well known at the turn of the 20th century in Europe and America for his research on the geography and geology of Iceland. Though Thoroddsen's contribution to these sciences is of great interest there is (...) another very interesting side to his career. This is his transformation from "mechanist" to "vitalist," which is the main focus of this paper. Thoroddsen, who began his career as a follower of Darwinism and Haeckelian monism, started to express his worries about materialism in society in 1902 culminating in a full-fledged denial of materialism in politics and science in 1910. Thoroddsen's transformation is in its nature a very complex process, but overall it can be traced to his view that materialism was destroying the Danish and Icelandic societies. In the years before 1902 Thoroddsen was a monistic atheist, relatively liberal in his politics, a firm believer in the power of the natural sciences, and considered the laws of physics the key to human progress. His views were strikingly similar to the ones Haeckel expounded in "The Riddle of the Universe" (1899), whose reception in Germany is explored in this paper in order to contextualise Thoroddsen's transformation. Between 1902 and 1910, however, Thoroddsen rejected this worldview in favour of conservative politics and ontological dualism, becoming a staunch believer in a higher, godly, authority. The theories of Darwin and Haeckel were now obsolete and needed to be replaced by the idea of purpose, direction and the final goal of life (Teleology). In order to understand Thoroddsen's transformation, I focus on the interaction of scientific knowledge, politics and other cultural issues in his writings. This is done by looking at Thoroddsen's views on biology, on the natural sciences in general, and on politics as published in Icelandic articles, manuscripts and letters in the period 1872 to 1910. I show that the transformation was due to influences from the German holistic movement, Thoroddsen's engagement with the Royal elite in Denmark and its political concerns, new developments in physics, and from personal traumas and professional disappointments. I also show that Thoroddsen's transformation seems to be a good example of the social shaping of scientific knowledge. (shrink)

The historical antecedents of Frege's treatment of binocular vision in "The thought" were the physiological writings of Johannes Mueller, Hermann von Helmholtz, and Emil du Bois-Reymond. In their research on human vision, logic was assigned an unexpected role: it was to be the means by which knowledge of a world extended in three dimensions arises from stimuli that are at best two-dimensional. An examination of this literature yields a richer understanding of Frege's insistence that a proper epistemology requires us to (...) recognize the existence and importance of nonsensible sources of knowledge. (shrink)

John Hughlings Jackson is a major figure at the origins of neurology and neuroscience in Britain. Alongside his contributions to clinical medicine, he left a large corpus of writing on localisation of function in the nervous system and other theoretical topics. In this paper I focus on Jackson’s “doctrine of concomitance”—his parallelist theory of the mind-brain relationship. I argue that the doctrine can be given both an ontological and a causal interpretation, and that the causal aspect of the doctrine is (...) especially significant for Jackson and his contemporaries. I interpret Jackson’s engagement with the metaphysics of mind as an instance of what I call meta-science—the deployment by scientists of metaphysical positions and arguments which help streamline empirical investigations by bracketing off unanswerable questions and focussing attention on matters amenable to the current tools of experimental research. (shrink)

ArgumentNineteenth-century Prussia was deeply entrenched in philhellenism, which affected the ideological framework of its public institutions. At Berlin’s Friedrich Wilhelm University, philhellenism provided the rationale for a persistent elevation of the humanities over the burgeoning experimental life sciences. Despite this outspoken hierarchy, professor of physiology Emil du Bois-Reymond eventually managed to increase the prestige of his discipline considerably. We argue that du Bois-Reymond’s use of philhellenic repertoires in his expositions on physiology for the educated German public contributed to the rise (...) of physiology as a renowned scientific discipline. Du Bois-Reymond’s rhetorical strategies helped to disassociate experimental physiology from clinical medicine, legitimize experimental practices, and associate the emerging discipline with the more esteemed humanities and theoretical sciences. His appropriation of philhellenic rhetoric thus spurred the late nineteenth-century change in disciplinary hierarchies and helped to pave the way for the current hegemonic position of the life sciences. (shrink)

In the debate on the reducibility of mind over body, we argue that it is not plausible to assume that such a reduction can be made only over the basal physical conditions, but rather that one must also take into account the psychophysiological bridge laws. This position is usually considered in the Philosophy of Mind to be antireductionist, but we prefer to call it “inductive reductionism”, due to the analogy with two other forms of determination in the Physical Sciences: causal (...) determinism and spatial scalar reductionism. The discussion is made with the use of abstract “epistemological probes”, such as Laplace’s demon, the scalar demon, and the psychophysiological demon. We also criticize the notion of synchronical causality used by Searle. (shrink)

Hilbert’s choice operators τ and ε, when added to intuitionistic logic, strengthen it. In the presence of certain extensionality axioms they produce classical logic, while in the presence of weaker decidability conditions for terms they produce various superintuitionistic intermediate logics. In this thesis, I argue that there are important philosophical lessons to be learned from these results. To make the case, I begin with a historical discussion situating the development of Hilbert’s operators in relation to his evolving program in the (...) foundations of mathematics and in relation to philosophical motivations leading to the development of intuitionistic logic. This sets the stage for a brief description of the relevant part of Dummett’s program to recast debates in metaphysics, and in particular disputes about realism and anti-realism, as closely intertwined with issues in philosophical logic, with the acceptance of classical logic for a domain reflecting a commitment to realism for that domain. Then I review extant results about what is provable and what is not when one adds epsilon to intuitionistic logic, largely due to Bell and DeVidi, and I give several new proofs of intermediate logics from intuitionistic logic+ε without identity. With all this in hand, I turn to a discussion of the philosophical significance of choice operators. Among the conclusions I defend are that these results provide a finer-grained basis for Dummett’s contention that commitment to classically valid but intuitionistically invalid principles reflect metaphysical commitments by showing those principles to be derivable from certain existence assumptions; that Dummett’s framework is improved by these results as they show that questions of realism and anti-realism are not an “all or nothing” matter, but that there are plausibly metaphysical stances between the poles of anti-realism and realism, because different sorts of ontological assumptions yield intermediate rather than classical logic; and that these intermediate positions between classical and intuitionistic logic link up in interesting ways with our intuitions about issues of objectivity and reality, and do so usefully by linking to questions around intriguing everyday concepts such as “is smart,” which I suggest involve a number of distinct dimensions which might themselves be objective, but because of their multivalent structure are themselves intermediate between being objective and not. Finally, I discuss the implications of these results for ongoing debates about the status of arbitrary and ideal objects in the foundations of logic, showing among other things that much of the discussion is flawed because it does not recognize the degree to which the claims being made depend on the presumption that one is working with a very strong logic. (shrink)

The late 19th-century Ignorabimus controversy over the limits of scientific knowledge has often been characterized as proclaiming the end of intellectual progress, and by implication, as plunging Germany into a crisis of pessimism from which Liberalism never recovered. My research supports the opposite interpretation. The initiator of the Ignorabimus controversy, Emil du Bois-Reymond, was a physiologist who worked his whole life against the forces of obscurantism, whether they came from the Catholic and Conservative Right or the scientistic and millenarian Left. (...) Du Bois-Reymond’s doubt that scientists would ever elucidate consciousness must therefore be seen as an endorsement, and not a rejection, of his faith in reason. (shrink)

Although culturally prominent modernist influences account for much of Skinner's early behaviorism, the subsequent changes in his views are appropriately considered as postmodern and are indebted to other sources. These changes are strikingly apparent in his 1945 publication. "The Operational Analysis of Psychological Terms." In that publication. Skinner introduced a probabilistic three-term contingency for verbal behavior with an expanded contextualism and an increased emphasis on consequence with a clear alignment to pragmatism. Instead of reaffirming the mechanistic and necessitarian values of (...) modernism that he had previously embraced, Skinner was aligning himself with the postmodern values of pragmatism and selectionism. (shrink)

The topic of this article is Hilbert’s axiom of solvability, that is, his conviction of the solvability of every mathematical problem by means of a finite number of operations. The question of solvability is commonly identified with the decision problem. Given this identification, there is not the slightest doubt that Hilbert’s conviction was falsified by Gödel’s proof and by the negative results for the decision problem. On the other hand, Gödel’s theorems do offer a solution, albeit a negative one, in (...) the form of an impossibility proof. In this sense, Hilbert’s optimism may still be justified. Here I argue that Gödel’s theorems opened the door to proof theory and to the remarkably successful development of generalized as well as relativized realizations of Hilbert’s program. Thus, the fall of absolute certainty came hand in hand with the rise of partially secure and reliable foundations of mathematical knowledge. Not all was lost and much was gained. (shrink)