This paper studies the notion of virtuality in the Bohr-Kramers-Slater theory of 1924. We situate the virtual entities of BKS within the tradition of the correspondence principle and the radiation theory of the Bohr model. We show how, in this context, virtual oscillators emerged as classical substitute radiators and were used to describe the otherwise elusive quantum transitions. They played an effective role in the quantum theory of radiation while remaining categorically distinct and ontologically separated from the quantum world of (...) the Bohr model. The notion of virtuality thus differs markedly from its counterpart in quantum mechanics or QFT. (shrink)

In optics, real images can be projected onto a screen, while virtual ones always remain behind mirrors. This apparently straightforward distinction is based on complex premises which emerged in the Early Modern period, and its development went hand in hand with a transformation of the notion of image, which became detached from sensual perception. In this article I will outline this historical process, and argue that the distinction between a real and virtual image still implies a reference to visual perception (...) which makes it problematic, yet useful for didactic purposes. (shrink)

This paper examines how scientific understanding is enhanced by virtual entities, focusing on the case of the synthetic cell. Comparing it to other virtual entities and environments in science, we argue that the synthetic cell has a virtual dimension, in that it is functionally similar to living cells, though it does not mimic any particular naturally evolved cell (nor is it constructed to do so). In being cell-like at most, the synthetic cell is akin to many other virtual objects as (...) it is selective and only partially implemented. However, there is one important difference: it is constructed by using the same materials and, to some extent, the same kind of processes as its natural counterparts. In contrast to virtual reality, especially to that of digital entities and environments, the details of its implementation is what matters for the scientific understanding generated by the synthetic cell. We conclude by arguing for the close connection between the virtual and the artifactual. (shrink)

This paper will not present a case study of the historical development of a virtual entity. Rather, I will develop an outlook on virtual entities in the sciences and propose a corresponding method for studying them (historically). In essence, my presentation can be considered a synthesis of different observations from the history and philosophy of science and has its roots in my dissertational research on the development of the virtual particle. Starting with a reflection on the role of presentism for (...) the study of concept formation and development processes, I will show, through the example of the virtual particle, how current debates and interpretations can inform our access to a historical reconstruction. Following these reflections, I will argue for a pragmatist account of concepts as tools for the scientific practitioners. According to the approach presented in my article, concepts perform their functions through representations, and I will lay special focus on verbal representations and their different functions within scientific reasoning. In conclusion, I will frame the outcome of my discussion in terms of a proposal that might, through further research, enrich our understanding of virtual entities in the sciences. (shrink)

This article discusses the meaning of the notion of virtuality in modern physics. To this end, it develops considerations on the introduction and establishment in nuclear physics of two independent concepts at the turn of the 1920s and 1930s: that of the virtual state, used in the context of neutron scattering studies, and that of the virtual transition, useful for the theoretical understanding of strong nuclear forces, which forms the basis of what are now called virtual particles. Their comparative analysis (...) highlights the theoretical nature of virtual entities and processes in modern physics. It also shows how the virtual has been associated with various purely physical attributes, leading to a form of polysemy of the term, from the beginning of the application of these concepts. (shrink)

The term “virtual entities” has a long tradition and a variety of meanings. My short article focuses on one particular meaning, as clearly defined by Charles Sanders Peirce in 1902. I will discuss the definition he provided and touch on the wide resonance it had and still has in science.

Metaphors that compare the computer to a human brain are common in computer science and can be traced back to a fertile period of research that unfolded after the Second World War. To conceptualize the emerging “intelligent” properties of computing machines, researchers of the era created a series of virtual objects that served as interpretive devices for representing the immaterial functions of the computer. This paper analyses the use of the terms “artificial” and “virtual” in scientific papers, textbooks, and popular (...) articles of the time, and examines how, together, they shaped models in computer science used to conceptualize computer processes. (shrink)

This paper will address scientific collaboration at the Zoophysiological Laboratory during the 1911–1945 directorship of Nobel Prize winner August Krogh. Using authorship information and acknowledgments from the laboratory’s publications, this paper maps the many researchers involved in the work. In total, 193 different people contributed to the work at the Zoophysiological Laboratory. The paper further analyzes what labor, materials, ideas, and knowledge were exchanged between the individuals in the laboratory. While science has become more collaborative throughout the twentieth century, this (...) paper underlines that collaboration was very much part of the research process in the early twentieth century. (shrink)

What should citizens understand about science to participate in democratic life? Against the prevailing approach, we argue that “what” a public understanding of science is about strongly depends on the specific epistemological nature of the science related issues considered in different contexts and circumstances. We identify three specific categories of such issues and show how, equally, specific models of public understanding are required to address them. Only by endorsing such an alternative approach will citizens arguably be able to form sound (...) opinions about those very issues, as well as to discuss and deliberate rationally about them. (shrink)

This paper proposes new ways of characterizing eighteenth-century French Cartesianism. Besides two widely-accepted elements—the belief in “strict mechanism” and the idea that to demonstrate in physics does not involve mathematics, but reference to mechanical models—I add two more, hitherto neglected, features. First, a strong emphasis on experimentalism, namely the view that experiments are crucial to natural-philosophical practice. Second, an epistemological thesis that I call “conjecturalism,” which consists in doubting that natural philosophy would attain an ultimate truth on the nature of (...) things. To explore these facets of Cartesianism, I focus on the works of the Jesuit Noël Regnault. (shrink)

The term “coenesthesia” was introduced at the end of the eighteenth century by the German physiologist Johann Christian Reil to designate the general perception of the living body through the nerves. Over the course of the nineteenth century, this notion circulated widely not only in Germany, but also in France, where it was developed in particular by Théodule Ribot. However, a good sixty years before Ribot, Maine de Biran had already employed the notion of “coenesthesia” to indicate the “immediate feeling (...) of existence,” which he distinguished from the apperception of the self in relation to the body. What Biran emphasized, in his philosophical appropriation of “coenesthesia,” is the impersonal and mostly unconscious nature of this feeling, which never leaves us and plays a key role in the shaping of our personal and conscious life, unnoticeably influencing the course of our ideas, our character, and the emotional tone of our perception of the world. The purpose of this article is to study Biran’s philosophical use of the notion of “coenesthesia” in the last phase of his philosophical reflection (1823–1824) in relation to the emergence of the problem of the unconscious. (shrink)

The term “coenesthesia” was introduced at the end of the eighteenth century by the German physiologist Johann Christian Reil to designate the general perception of the living body through the nerves. Over the course of the nineteenth century, this notion circulated widely not only in Germany, but also in France, where it was developed in particular by Théodule Ribot. However, a good sixty years before Ribot, Maine de Biran had already employed the notion of “coenesthesia” to indicate the “immediate feeling (...) of existence,” which he distinguished from the apperception of the self in relation to the body. What Biran emphasized, in his philosophical appropriation of “coenesthesia,” is the impersonal and mostly unconscious nature of this feeling, which never leaves us and plays a key role in the shaping of our personal and conscious life, unnoticeably influencing the course of our ideas, our character, and the emotional tone of our perception of the world. The purpose of this article is to study Biran’s philosophical use of the notion of “coenesthesia” in the last phase of his philosophical reflection (1823–1824) in relation to the emergence of the problem of the unconscious. (shrink)

Leibniz is one of the philosophers who is most present in the philosophy of Maine de Biran, particularly from 1813 onwards. His influence is decisive in the reform of metaphysics (or First Philosophy) that he carries out from that moment on, reviving the notion of substance. Leibniz allows him to reconcile it with the idea of force, and thus to link it to the primitive fact of consciousness. This move has often been emphasized by commentators, but what has been less (...) studied is the way in which this reform takes place in Biran’s intellectual trajectory from the time when he claimed to be an Ideologist inspired by Condillac’s philosophy, to the last texts written in 1824, when he eventually adopted a spiritualist monism that owed much to Leibniz, abandoning the Cartesian-inspired metaphysical dualism to which he had been committed until then. (shrink)

This article compares the phenomena of “tic” and “slip of the tongue” [lapsus] as they have been described by Maine de Biran and Victor Egger, including a possible reception of Biran’s thought by Egger. In the twentieth century these phenomena will be analysed by psychoanalysts, but their first description appears in nineteenth-century French philosophy. Emerging from the analysis of Biran’s “tics” and Egger’s “slips” in the nineteenth century, the concept of habit becomes linked to a reflection on the unconscious. Tic (...) and slip of the tongue constitute, each in its own way, the place where habit exhibits its most peculiar characteristic, that of being always suspended in the dual dialectic of the voluntary and the involuntary, of the conscious and the unconscious. Maine de Biran’s “habit tics” underline the tendency set by habit for which voluntary and conscious actions become involuntary and unconscious, whereas Egger defines slip of the tongue as an involuntary and unconscious event that allows the birth of new habits. (shrink)

Focusing on the reception of Maine de Biran by Alexis Bertrand in his thesis, L’aperception du corps humain par la conscience (1880), I will demonstrate how the “corps propre” (one’s own body) becomes a key concept in order to re-orientate the French spiritualist movement. To do so, Bertrand’s neo-Biranism uses a new methodology with phenomenological issues. The image of the body, the primitive space or the engagement within the world becomes new research themes for spiritualism. His interpretation of Biran’s philosophy (...) leads him to criticize mechanistic epistemology, and especially the concept of reflex. In this context, Bertrand proposes an animist metaphysics, aiming to reconcile his Biranism with the advances of science. As a consequence, the history of the concept of one’s own body must take into account metaphysical perspectives and not only scientific and experimental researches. (shrink)

This contribution explores the concept of the unconscious as articulated by Proust in his À la recherche du temps perdu (Proust ([1913–1927] 1998–1999) and in a series of documents and texts that preceded it. It aims at understanding whether and to what extent Proust can be placed in a line of French thought that begins with the work of Maine de Biran and culminates in the reception in the second half of the nineteenth century of Biranism by French alienists: doctors (...) specialized in the study of mental alienation. This type of interpretation of Biran’s doctrine is attuned to the increasing attention which, at the time of Proust’s education, was given to the unconscious and to the idea that, alongside the conscious self, there is an unconscious self, understood as a secondary personality that can manifest itself in the life of the individual in both normal and pathological ways. Following the interpretative path pursued in Piazza (1997, 2017), Bizub (2006), and Fraisse (2013), this article takes into account both Proust’s secondary and university education and his familiarity with experimental psychology, to which he was introduced by his father. (shrink)

The foundation of morality, and mainly, the possibility of moral sentiments that are universal and inalienable, is a central problem in Maine de Biran’s philosophy. Many studies focus on the part played by the self in Maine de Biran’s late philosophy, but relatively few consider with precision the importance of the concept of sympathy in this context. In this paper, I would like to show that this concept, which Biran mobilizes from his first to his last writings, is an important (...) conceptual resource in his enterprise of founding morality. I will draw on three main texts that cover almost the entire period in which he wrote, namely, his Mémoire sur l’influence de l’habitude sur la faculté de penser ([1802] 1987), his Mémoire sur les perceptions obscures ou sur les impressions générales affectives et les sympathies en particulier ([1807] 1984), and his Fragments relatifs aux fondements de la morale et de la religion ([1819] 1859). The main finding is that sympathy occupies a central place in this enterprise of moral foundation but undergoes profound and almost contradictory conceptual re-elaborations throughout Biran’s intellectual journey. Although in his first philosophical texts Biran concentrates on the fundamental dimension of organic sympathy, he rejects it almost entirely in his last texts in favor of an analysis of the sympathy between the selves. (shrink)

This paper aims to analyze Pierre Janet’s interpretation of Maine de Biran’s notion of the “unconscious” through a comparative study between L’automatisme psychologique (1889) and some Biranian writings devoted to the problem of pure affections. The objective is to question whether Janet’s psychological reading of this very notion had been faithful to Biran’s intentions, and to understand what kind of Biranism Janet is referring to when dealing with the problem of the unconscious.