This article analyses three basic concepts of Ludwik Fleck’s Genesis and Development of a Scientific Fact. It shows first that Fleck’s notion of „directed perception“ is closely linked to Jakob von Uexküll’s writings on the „Umwelt“ of animals and humans. The article then proposes to regard the epistemological debates surrounding parapsychology as an important testing ground for the Fleckian concept of „mood“ and his concomitant hypotheses about „the tenacity of systems of opinion and the harmony of illusions“. It finally argues (...) that Fleck’s modification of Wilhelm Jerusalem’s idea of the „social consolidation“ of knowledge helps us to understand the indebtedness of Fleck towards early functionalist sociology as well as his strong belief in „specific historical laws governing the development of ideas“. The historical semantics of Fleck’s works hence proves that his insights are neither marginal nor revolutionary but rather deeply rooted within scientific traditions from the late 19th and early 20th centuries. (shrink)

This article critically interrogates contemporary forms of addiction medicine that are portrayed by policy-makers as providing a ‘rational’ or politically neutral approach to dealing with drug use and related social problems. In particular, it examines the historical origins of the biological facts that are today understood to provide a foundation for contemporary understandings of addiction as a ‘disease of the brain’. Drawing upon classic and contemporary work on ‘styles of thought’, it documents how, in the period between the mid-1960s and (...) the mid-1970s, such facts emerged in relation to new neurobiological styles of explaining and managing social problems associated with drug abuse, and an alliance between a relatively marginal group of researchers and American policy-makers who were launching the ‘War on Drugs’. Beyond illustrating the political and material conditions necessary for the rise of addiction neuroscience, the article highlights the productivity of neurobiological thought styles, by focusing on the new biological objects, treatments and hopes that have emerged within the field of addiction studies over the last several decades. (shrink)

Using the conceptual tools of philosopher of science Ludwik Fleck, I argue that the reframing of autism as a neurodevelopmental spectrum disorder is constrained by two governing ‘styles of thought’ of contemporary psychiatry. The first is the historically conditioned ‘readiness for directed perception’ of, and thinking in terms of, ontologically distinct diseases. The clinical gaze of mental health professionals, the bureaucratic needs of health administration, the clinical and scientific utility of disease categories, and the practices of autism-oriented advocacy groups all (...) imply a bias toward thinking about autism and related disorders as ontologically distinct psychiatric and scientific entities. Second, within the ‘neuromolecular style of thought’, mental disorders are more and more located at the neurobiological levels of the brain. In autism research, one of the biggest challenges is the identification of autism's neurobiological singularity. However, at a moment when biological and categorical approaches toward autism face serious empirical difficulties, a balance is established that holds together these two styles of thought. With a need to account for some of the most persistent uncertainties and conflicts in autism research, namely ubiquitous heterogeneity and a failure to identify disease specific biomarkers, the reframing of autism as a neurodevelopmental spectrum disorder satisfies the scientific, institutional and socio-political needs for stability and homogenization. (shrink)

Ludwik Fleck is widely recognized as a precursor of Science and Technology Studies, but his case study on the development of the Wassermann reaction as a test for detecting syphilis has never been subjected to detailed empirical scrutiny. The fact that Fleck?s monograph is based on a limited set of documentary sources makes his work vulnerable to uncharitable critics. The problematic relation between thought collective and individual scientists in Fleck?s theoretical approach is another reason for a systematic re-examination of his (...) case study, using materials on the early period in the history of the Wassermann reaction (1906?1912). My re-examination highlights several problems in Fleck?s account: a misinterpretation of the switch from antigen detection to antibody detection; a neglect of the ?clinical connection?; an overemphasis on the importance of collective experience leading to implausible views on gross retrospective distortions supposedly inflicted by this experience upon the memories of individual participants; and, finally, a misjudgement of the significance of the acrimonious dispute over the intellectual ownership of the Wassermann reaction. What remains unscathed is Fleck?s picture of a zig-zag course of development from false initial assumptions via detours and cul-de-sacs to a clinically usable test in the end. (shrink)

The rediscovery in the mid-1970s of Ludwik Fleck's initially neglected monograph, Entstehung und Entwicklung einer Wissenschaftlichen Tatsache, published in 1935 and translated in 1979 as Genesis and Development of a Scientific Fact, has resulted in extensive, still ongoing, secondary writings, mainly within the humanities. Fleck has been interpreted as furthering a relativistic conception of science. Nowadays, he is often viewed as an important contributor to contemporary sociology of science and a forerunner to Thomas Kuhn. Fleck's account of the Wassermann reaction, (...) which forms the basis of his epistemology, has been praised as developed by a scientist well acquainted with the field in question. Because of the scarcity of available material on Fleck, however, the question of his sources has remained an unsolved issue. In the present article, an alternative reading is suggested. By focusing on the scientific content of the monograph, mainly neglected in the modern interpretations of Fleck, and on the so far overlooked sources of his writings traced back to their German origin, a better understanding of Fleck's account of the Wassermann reaction can be given. The consequences of this alternative reading for the conception of Fleck's monograph and for the impetus of his mission are discussed. (shrink)

: Since its almost serendipitous rediscovery in the late seventies, Fleck's monograph, Entstehung und Entwicklung einer wissenschaftlichen Tatsachee, initially published in 1935, translated into English in 1979 (Genesis and Development of a Scientific Fact), has been met with increasing acclaim within the philosophy and the sociology of science. In historizing, sociologizing and relativizing science, Fleck is claimed to have expressed prescient views on the history, philosophy and sociology of science and in deeply influencing Kuhn. Though the neglect of Fleck by (...) his contemporaries has been difficult to account for, the basis of his epistemology has evoked little interest, partly due to the lack of apparent sources. Fleck's philosophical writings, published between 1927 and 1939, indicate, however, a polemic, deeply ingrained in an ongoing debate, on the standing of old established scientific disciplines versus new and emerging ones, occasioned by the rapid changes within the natural sciences. Most obvious to the lay community, and also reflected in the new positivist philosophy, were the revolutionary changes within physics. As a participant in the debate, eagerly striving for recognition, Fleck used modern physic heuristically as the basis of his epistemology. The tracing of his sources, and the voices of other contemporaneous scientists opposing his views, are attempted. (shrink)

In 1948 Ludwik Fleck published a paper in Polish discussing the use of humans in medical experiments, thereby addressing his peers. Though the paper has so far not been translated or studied, it has been taken to indicate Fleck’s deep commitment to ethical questions, notably the question of informed consent. In being written by a former victim of the Nazi policy and a survivor of the Holocaust also acting as an expert witness in the trial of the IG Farben in (...) Nuremberg, the paper is of interest. A scrutiny of Fleck’s text and related sources discloses, however, not only the complexity of the issue at the centre of the Nuremberg trial, but also Fleck’s unexpected stance in seemingly adducing his arguments from both the German defendants and the prosecution, heavily informed by US scientists. Further, the contentious discussion of the past in Fleck’s paper reveals its links to modern bioethical discussion. Though sometimes oblivious of that past, it still faces the same questions. (shrink)

The present thesis is based on a scientifically-informed, contextualized and historicized reading of Ludwik Fleck. In addition to his monograph, the material studied includes his additional philosophical writings, his internationally-published scientific articles and two, thus-far-unstudied postwar Polish papers related to his Buchenwald experiences. The sources provided by Fleck have been traced back to the time of their origin. Based on the above material, it is argued that, rather than relativizing science and deeply influencing Kuhn, Fleck, attempting to participate in the (...) current debates, is an ardent proponent of science, offering an internal account of its pursuit that accords with his oft-contested epistemic concepts, e.g., Denkzwang, Sinnsehen and Kopplungen. The exposure of his description of the Wassermann reaction discloses a highly selective reading of the sources available at the time, but also reveals its relation to the current debate on Einzelwissenschaften, or the standing of new emerging disciplines versus age-old ones, all occasioned by the remarkable progress of science that has also affected philosophy. The divide between philosophers and scientists on the philosophical implications of modern physics is exposed, as is Fleck’s heuristic use of the latter topic in his epistemology. A more realistic account of his often-valued scientific accomplishments is provided. It is argued that the modern interpretation or received humanist view of Fleck is based on the opposition, at the time Fleck’s monograph was rediscovered, of STS writers to a scientifically-informed reading of his texts. An additional corrective to the received view of Fleck is found in some of his postwar Polish papers related his Buchenwald experiences. The latter might also provide an answer to some of the contradictions inherent in the modern mythology surrounding Fleck. In amply exposing the precarious situation of the time, and the complexity of the ethical issues at stake, Fleck’s papers in fact generate age-old philosophical questions still worth contemplating. (shrink)