Décio Krause has achieved a thorough reconstruction of logic and set theory, to account for the unusual objects or quasi-objects of quantum physics. How can one cope with the (partial) lack of criteria of individualization and re-identification of quantum objects, when the elementary operations of counting them, and constituting sets of them, are to be performed? Here, I advocate an alternative strategy, that consists in going below the level of logic and set theory to inquire how their categories are generated (...) in the experience and activity of knowing subjects, and whether this mode of category generation is still relevant in the field of experimental quantum physics. This project of a “genealogy of logic” is borrowed from Husserl’s last treatise, entitled Experience and Judgment. It is transposed to the case of quantum physics by way of a QBist approach of Mott’s theorization of quasi-“trajectories” in Wilson cloud chambers. It is also shown that one of the most appropriate ontologies for quantum objects or quasi-objects involves reversing the (grammatical) roles of subject and predicate, as advocated by Japanese philosopher Nishida Kitarô in reasonable agreement with both Schrödinger’s and Krause’s approaches of the concept of “particle”. (shrink)

In its most radical version, Neurophenomenology asks researchers to suspend the quest of an objective solution to the problem of the origin of subjectivity, and clarify instead how objectification can be obtained out of the coordination of subjective experiences. It therefore invites researchers to develop their inquiry about subjective experience with the same determination as their objective inquiry. However, accessing lived experience raises the question of the investigation method, and of the reliability of its results. Here, we present an accurate (...) method of exploration of lived experience: the elicitation (or microphenomenological) interview. In the course of this interview, one first triggers a form of “phenomenological reduction”, then assists the subject in retrieving or “evoking” past experiences, and finally helps the subject to perform acts of attention about this evoked experience, to describe it faithfully. It is shown that this method addresses a set of traditional objections against introspection. (shrink)

According to Husserl, the epochè must be left incomplete. It is to be performed step by step, thus defining various layers of “reduction.” In phenomenology at least two such layers can be distinguished: the life-world reduction, and the transcendental reduction. Quantum physics was born from a particular variety of the life-world reduction: reduction to observables according to Heisenberg, and reduction to classical-like properties of experimental devices according to Bohr. But QBism has challenged this limited version of the phenomenological reduction advocated (...) by the Copenhagen interpretation. QBists claim that quantum states are “expectations about experiences of pointer readings,” rather than expectations about pointer positions. Their focus on lived experience, not just on macroscopic variables, is tantamount to performing the transcendental reduction instead of stopping at the relatively superficial layer of the life-world reduction. I will show that quantum physics indeed gives us several reasons to go the whole way down to the deepest variety of phenomenological reduction, may be even farther than the standard QBist view: not only reduction to experience, or to “pure consciousness,” but also reduction to the “living present.”. (shrink)

When he formulated the program of neurophenomenology, Francisco Varela suggested a balanced methodological dissolution of the hard problem of consciousness. I show that his dissolution is a paradigm which imposes itself onto seemingly opposite views, including materialist approaches. I also point out that Varela's revolutionary epistemological ideas are gaining wider acceptance as a side effect of a recent controversy between hermeneutists and eliminativists. Finally, I emphasize a structural parallel between the science of consciousness and the distinctive features of quantum mechanics. (...) This parallel, together with the former convergences, point towards the common origin of the main puzzles of both quantum mechanics and the philosophy of mind: neglect of the constitutive blindspot of objective knowledge. (shrink)

According to Husserl, the epochè (or suspension of judgment) must be left incomplete. It is to be performed step by step, thus defining various layers of “reduction.” In phenomenology at least two such layers can be distinguished: the life-world reduction, and the transcendental reduction. Quantum physics was born from a particular variety of the life-world reduction: reduction to observables according to Heisenberg, and reduction to classical-like properties of experimental devices according to Bohr. But QBism has challenged this limited version of (...) the phenomenological reduction advocated by the Copenhagen interpretation. QBists claim that quantum states are “expectations about experiences of pointer readings,” rather than expectations about pointer positions. Their focus on lived experience, not just on macroscopic variables, is tantamount to performing the transcendental reduction instead of stopping at the relatively superficial layer of the life-world reduction. I will show that quantum physics indeed gives us several reasons to go the whole way down to the deepest variety of phenomenological reduction, may be even farther than the standard QBist view: not only reduction to experience, or to “pure consciousness,” but also reduction to the “living present.”. (shrink)

Emergence is interpreted in a non-dualist framework of thought. No metaphysical distinction between the higher and basic levels of organization is supposed, but only a duality of modes of access. Moreover, these modes of access are not construed as mere ways of revealing intrinsic patterns of organization: They are supposed to be constitutive of them, in Kant’s sense. The emergent levels of organization, and the inter-level causations as well, are therefore neither illusory nor ontologically real: They are objective in the (...) sense of transcendental epistemology. This neo-Kantian approach defuses several paradoxes associated with the concept of downward causation, and enables one to make good sense of it independently of any prejudice about the existence (or inexistence) of a hierarchy of levels of being. (shrink)

“Ontological emergence” of inherent high-level properties with causal powers is witnessed nowhere. A non-substantialist conception of emergence works much better. It allows downward causation, provided our concept of causality is transformed accordingly.

A phenomenological view of contemplative disciplines is presented. However, studying mindfulness by phenomenology is at odds with both neurobiological and anthropological approaches. It involves the first-person standpoint, the openness of being-in-the-world, the umwelt of the meditator, instead of assessing her neural processes and behaviors from a neutral, distanced, third-person standpoint. It then turns out that phenomenology cannot produce a discourse about mindfulness. Phenomenology rather induces a cross-fertilization between the state of mindfulness and its own methods of mental cultivation. A comparison (...) between the epochè, the phenomenological reduction, and the practice of mindfulness, is then undertaken. (shrink)

Les études que nous rassemblons ici font écho aux débats les plus récents sur la philosophie des mathématiques de Wittgenstein, qui est bien certainement l'aspect le plus controversé de son œuvre. Elles sont, pour l'essentiel, consacrées au statut et aux fonctions des preuves mathématiques et aux "réactions" du philosophe aux théorèmes de Gödel. C'est dire qu'elles tournent autour de l'anti-platonisme foncier de Wittgenstein en philosophie des mathématiques et de son refus catégorique de toute méta-mathématique. E. R.

Quantum Mechanics has imposed strain on traditional (dualist and representationalist) epistemological conceptions. An alternative was offered by Bohr and Heisenberg, according to whom natural science does not describe nature, but rather the interplay between nature and ourselves. But this was only a suggestion. In this paper, a systematic development of the Bohr-Heisenberg conception is outlined, by way of a comparison with the modern self-organizational theories of cognition. It is shown that a perfectly consistent non-representationalist (and/or relational) reading of quantum mechanics (...) can be reached thus. (shrink)

Le présent tome traite de la mécanique quantique non relativiste. Il comprend, outre ses fondements, de multiples applications de la mécanique quantique dans une plus large mesure que dans les cours généraux. Dans leur exposé des questions générales, les auteurs dégagent au maximum l'essence physique de la théorie, à partir de laquelle ils développent l'appareil mathématique. Contrairement au schéma habituel allant des théorèmes mathématiques relatifs aux opérateurs linéaires, les auteurs déduisent les exigences mathématiques auxquelles doivent répondre les opérateurs et les (...) fonctions propres à partir de la position physique du problème. Des compléments mathématiques sont donnés en appendice. (shrink)

This book is the final outcome of two projects. My first project was to publish a set of texts written by Schrodinger at the beginning of the 1950's for his seminars and lectures at the Dublin Institute for Advanced Studies. These almost completely forgotten texts contained important insights into the interpretation of quantum mechanics, and they provided several ideas which were missing or elusively expressed in SchrOdinger's published papers and books of the same period. However, they were likely to be (...) misinterpreted out of their context. The problem was that current scholarship could not help very much the reader of these writings to figure out their significance. The few available studies about SchrOdinger's interpretation of quantum mechanics are generally excellent, but almost entirely restricted to the initial period 1925-1927. Very little work has been done on Schrodinger's late views on the theory he contributed to create and develop. The generally accepted view is that he never really recovered from his interpretative failure of 1926-1927, and that his late reflections are little more than an expression of his rising nostalgia for the lost ideal of picturing the world, not to say for some favourite traditional picture. But the content and style of Schrodinger's texts of the 1950's do not agree at all with this melancholic appraisal; they rather set the stage for a thorough renewal of accepted representations. In order to elucidate this paradox, I adopted several strategies. (shrink)

Context: Varela’s neurophenomenology was conceived from the outset as a criticism and dissolution of the “hard problem” of the physical origin of consciousness. Indeed, the standard (….

The two major options on which the current debate on the interpretation of quantum mechanics relies, namely realism and empiricism, are far from being exhaustive. There is at least one more position available, which is metaphysically as agnostic as empiricism, but which shares with realism a committment to considering the structure of theories as highly significant. The latter position has been named transcendentalism after Kant. In this paper, a generalized version of Kant's method is used. This yields a reasoning that (...) one is entitled to call a transcendental deduction of some major formal features of quantum mechanics. (shrink)

Few researchers of the past made sense of the collapse of representations in the quantum domain, and looked for a new process of sense-making below the level of representations: the level of the phenomenology of perception and action; the level of the elaboration of knowledge out of experience. But some recent philosophical readings of quantum physics all point in this direction. They all recognize the fact that the quantum revolution is a revolution in our conception of knowledge. In these recent (...) readings of quantum physics, quantum states are primarily generators of probabilistic valuations. Accordingly, they should not be seen as statements about what is the case, but as statements about what each agent can reasonably expect to be the case. Three features of such non-interpretational, non-committal approaches to quantum physics strongly evoke the phenomenological epistemology. These are: their deliberately first-person stance; their suspension of judgment about a presumably external domain of objects, and subsequent redirection of attention towards the activity of constituting these objects; their perception-like conception of quantum knowledge. But beyond phenomenological epistemology, these new approaches of quantum physics also make implicit use of a phenomenological ontology. Chris Fuch’s participatory realism thus formulates a non-external variety of realism for one who is deeply immersed in reality. But participatory realism strongly resembles Merleau-Ponty’s endo-ontology, which is a phenomenological ontology for one who deeply participates in Being. This remarkable analogy is supported by Merleau-Ponty himself. Indeed, 50 years before QBism, Merleau-Ponty acknowledged the strong kinship between the status of quantum mechanics and his phenomenology of embodiment. He did so in two texts that remained unpublished until after his death: Visible and invisible, and the Lectures on Nature. The final part of this article is then devoted to a study of Merleau-Ponty’s conception of quantum physics. (shrink)

It is pointed out that the probabilistic character of a theory does not indicate by itself a distancing with respect to the norms of objectification. Instead, the very structure of the calculation of probabilities utilised by this theory is capable of bearing the trace of a constitution of objectivity in Kant’s sense. Accordingly, the procedure of the constitution of objectivity is first studied in standard and in quantum cases with due reference to modern cognitive science. Then, an examination of the (...) differences between classical and quantum probabilities is performed. It is shown that the form of the quantum calculation of the probabilities carries the mark of the contextuality of the phenomena on which it bears. Conversely, certain conditions that have the form of Bell’s inequalities carry the mark of decontextualization. (shrink)

info:eu-repo/semantics/publishedVersion.

On distingue trois strates interdépendantes dans les paradigmes kuhniens : le savoir-faire expérimental, le formalisme, et les engagements ontologiques. Seul le niveau ontologique se trouve intégralement et explicitement exprimé dans le cadre du langage courant. Il semble donc qu’assimiler l’« incommensurabilité » des paradigmes à une intraductibilité revient à esquiver une partie du problème. Afin de compenser cette apparente incomplétude, une conception néo-pragmatiste et structuraliste de la physique est développée, en l’appuyant sur les réflexions d’A. Pickering et I. Hacking. Au (...) lieu d’être marginalisé, le domaine des pratiques devient dans cette conception l’axe central où se définissent toutes les composantes de la connaissance, et où se décident toutes les questions, y compris celle de l’incommensurabilité. (shrink)

On distingue trois strates interdépendantes dans les paradigmes kuhniens : le savoir-faire expérimental, le formalisme, et les engagements ontologiques. Seul le niveau ontologique se trouve intégralement et explicitement exprimé dans le cadre du langage courant. Il semble donc qu’assimiler l’« incommensurabilité » des paradigmes à une intraductibilité revient à esquiver une partie du problème. Afin de compenser cette apparente incomplétude, une conception néo-pragmatiste et structuraliste de la physique est développée, en l’appuyant sur les réflexions d’A. Pickering et I. Hacking. Au (...) lieu d’être marginalisé, le domaine des pratiques devient dans cette conception l’axe central où se définissent toutes les composantes de la connaissance, et où se décident toutes les questions, y compris celle de l’incommensurabilité. (shrink)

The so-called paradoxes of quantum physics are easily disposed of as soon as one accepts that there are no such things as intrinsically existing particles and their intrinsic properties, but that both particles and properties are relational “observables.” Accordingly, quantum physics does not offer a “description of the outer world,” but rather a prescription about how to make probabilistic predictions within a participatory environment. The latter view looks quite radical with respect to standard Western Aristotelian ontology; but it looks natural (...) in the context of the Indian-Buddhist concept of Pratītyasamutpāda which underpins Śūnyatā. Special attention will then be devoted to the quantum feature of non-separability, which displays remarkable similarities with Pratītyasamutpāda. Finally, the meaning of such twofold parallel between quantum physics and Śūnyatā will be discussed. This parallel will be related to the similarity of epistemological situation between knowing a world from which we are not entirely separated and knowing oneself. (shrink)

This paper analyzes how conflicts of perspective are resolved in the field of the human sciences. Examples of such conflicts are the duality between the actor and spectator standpoints, or the duality of participancy between a form of social life and a socio-anthropological study of it. This type of duality look irreducible, because the conflicting positions express incompatible interests. Yet, the claim of incommensurability is excessive. There exists a level of mental activity at which dialogue and resolution are possible. Reaching (...) this level only implies that one comes back to a state of undetermination between situations and interests whose best model is a superposition of states in generalized quantum theory. Some applications of this strategy of going back below the point of state reduction , from the psychology of perception to the history of civilization, are presented. (shrink)

Six arguments against the view that conscious experience derives from a material basis are reviewed. These arguments arise from epistemology, phenomenology, neuropsychology, and philosophy of quantum mechanics. It turns out that any attempt at proving that conscious experience is ontologically secondary to material objects both fails and brings out its methodological and existential primacy. No alternative metaphysical view is espoused (not even a variety of Spinoza’s attractive double-aspect theory). Instead, an alternative stance, inspired from F. Varela’s neurophenomenology is advocated. This (...) unfamiliar stance involves (i) a complete redefinition of the boundary between unquestioned assumptions and relevant questions ; (ii) a descent towards the common ground of the statements of phenomenology and objective natural science : a practice motivated by the quest of an expanding circle of intersubjective agreement. (shrink)

This article aims at reducing the gap between mathematics and physics from a Wittgensteinian point of view. This gap is usually characterized by two discriminating features. The propositions of physics assert something which might be false; they have a hypothetical character. On the contrary, since mathematical propositions are rules that condition the form of assertions, they remain immune from falsification. The propositions of physics refer to facts that may confirm or refute them. On the contrary, since mathematical propositions have no (...) meaning independently of the demonstration procedures, it cannot be said that they refer to “facts” that pre-exist demonstrations. If we take a closer look, however, these two differences fade away. On the one hand, the propositions of physics are more resistant to experimental tests than has been said in the wake of logical positivism. On the other hand, the “factual” empirical material is defined and co-constituted by instruments whose arrangement is determined by the theory to be tested. I conclude by discussing the possibility of a Wittgensteinian philosophy of contemporary physics. (shrink)

La neurofenomenologia è l’ultimo grande progetto al contempo scientifico, filosofico ed esistenziale al quale Francisco Varela ha lavorato. Ma, prima di parlarne, vorrei evocare brevemente quella che credo sia la fonte vissuta e unica della sua opera, e in particolar modo della neurofenomenologia. Questa fonte, così come l’ho percepita, è una volontà molto forte, quasi tirannica, di tenere insieme l’integralità dei fili del tessuto umano, a partire dall’indagine scientifica spinta a un optimu...

Un argument important contre le constructivisme social a été formulé par John Searle en 1995. Il consiste non seulement à admettre, mais aussi à analyser jusqu’à ses dernières implications le concept de construction sociale d’une réalité ; puis à prouver que l’une des implications en question est l’impossibilité de généraliser ce concept à toutes les réalités que nous reconnaissons dans la vie quotidienne et dans les sciences. Mieux encore, J. Searle...

Toute science, admet-on, commence par détacher un objet en le rendant indépendant des sujets et des situations. Mais cette conception étroite de la connaissance scientifique laisse subsister des zones d'ombre. La conscience n'est pas un objet. Elle est ce sans quoi rien ne pourrait être pris pour objet. La conscience n'est pas détachable des sujets, car elle s'identifie à ce qui est vécu par un sujet. De façon analogue, en physique quantique, un phénomène n'est pas dissociable de son contexte expérimental, (...) car il s'identifie à ce qui se manifeste à grande échelle au laboratoire. Que faire pour ne pas laisser ces cas extrêmes de côté? Généraliser la méthode scientifique. Ne plus la borner à définir et à caractériser des objets, mais l'étendre à la coordination directe des expériences. Telle est la révolution de pensée qu'il faut accomplir pour résoudre, ou plutôt dissoudre, deux questions-limites de la science : le problème de l'origine de la conscience et le paradoxe du "chat de Schrödinger" en physique quantique. (shrink)

A complete reappraisal of the philosophical meaning of Everett's interpretation of quantum mechanics is carried out, by analysing carefully the role of the concept of "observer" in physics. It is shown that Everett's interpretation is the limiting case of a series of conceptions of the measurement problem which leave less and less of the observer out of the quantum description of the measuring interaction. This limiting case, however, should not be considered as one wherein nothing is left outside the description. (...) Something is still needed besides this description: pure cognitive capacity, the subject, or, in a very abstract sense: "mind". The set of branches which arise, according to Everett, from a measuring interaction, gain a renewed signification. They do not refer to distinct "worlds", but to the points of view "mind" can identify itself to. This idea is compared and contrasted with Squires' "selection" of a branch by the mind (without quotation marks). Finally, the notion of indeterminism in quantum mechanics gains an unexpected and new light from a strict application of the previous ideas. (shrink)

There are two versions of the putative connection between consciousness and the measurement problem of quantum mechanics : consciousness as the cause of state vector reduction, and state vector reduction as the physical basis of consciousness. In this article, these controversial ideas are neither accepted uncritically, nor rejected from the outset in the name of some prejudice about objective knowledge. Instead, their origin is sought in our most cherished (but disputable) beliefs about the place of mind and consciousness in the (...) world. It is first pointed out that these common beliefs about mind and consciousness arise from reification of situated first-person experience. Then, situatedness is shown to be a constitutive part of any exhaustive treatment of quantum measurements. It turns out that the alleged connection between consciousness and the measurement problem is a symptom of (i) the ineliminability of our being situated from the end-product of science, and (ii) our difficulty to express correctly this being situated. (shrink)

Rovelli’s RQM is first characterized by contrast with both Everett’s and Bohr’s interpretations of quantum mechanics. Then, it is shown that a basic difficulty arises from the choice of formulating RQM in a naturalistic framework. Even though, according to Rovelli’s interpretation, statements about the world only make sense relative to certain naturalized observers described by means of quantum mechanics, this very meta-statement seems to make sense relative to a sort of super-observer which does not partake of the naturalized status of (...) ordinary observers. The difficulty is solved by substituting functional reference frames for physical (or naturalized) observers throughout. Instead of being relative to physical observers, statements about the state vector of physical systems are here relative to well-defined projects of probabilistic prediction which may be embodied by several physical observers. (shrink)

In this paper we list the various criticisms that have been formulated against introspection, from Auguste Comte denying that consciousness can observe itself, to recent criticisms of the reliability of first person descriptions. We show that these criticisms rely on the one hand on poor knowledge of the introspective process, and on the other hand on a naïve conception of scientific objectivity. Two kinds of answers are offered: the first one is grounded on a refined description of the process of (...) becoming aware of one's experience and describing it, the second one relies on a comparison with the methods of the experimental sciences. We conclude the article by providing a renewed definition of 'the truth' of a first person description. (shrink)

The notion of “enaction,” as originally expounded by Varela and his colleagues, was introduced into cognitive science as part of a broad philosophical framework combining science, phenomenology, and Buddhist philosophy. Its intention was to help the researchers in the field avoid falling prey to various dichotomies bedeviling modern philosophy and science, and serve as a “conceptual evocation” of “non-duality” or “groundlessness: an ongoing and irreducible circulation between the flux of lived experience and the search of reason for conceptual invariants, is (...) to function as conceptual evocations of this back-and-forth exchange between knowing and being. However, if this overall framework is discarded, as is often the case in contemporary accounts, enaction loses its radical impetus and becomes mellowed down to yet another version of naturalized epistemology. Implications: Taking the notion of enaction seriously implies a radical shift in our conceptions of science and knowledge, as it encompasses a theoretical and existential move away from a detached observer to embedded and engaged cognizer. Thus, our manner of thinking can no longer be considered in isolation from our manner of being, which indicates a deep interconnection between epistemology and ethics, and may entail profound changes in the definition of the aims, methods, and values of the research community: self-transformation as a consequence of, and condition for, understanding. Constructivist content: The target article advocates a critical approach to realist presuppositions in contemporary science and philosophy, and emphasizes a deep interrelation between being and knowing, between ethics and epistemology. (shrink)

Le sens de la mécanique quantique doit être interrogé en revenant au plus près de l'expérience incertaine, à partir de laquelle les possibilités futures sont évaluées. L'idée même d'une pluralité de mondes est reconduite aux situations élémentaires de la vie humaine où s'opposent l'actualité collectivement reconnue et les possibilités intellectuellement envisagées.

Quel est le sens des théories physiques? Il fut une époque où le débat entre réalistes et anti-réalistes ne souffrait guère de nuances. Le réalisme scientifique était vide parce qu'il renvoyait à un ailleurs ou à un futur indéfinis ; l'anti-réalisme était aveuglé parce qu'il privait la recherche de but et de direction. Aujourd'hui, bien des réalistes ont appris à se défaire des équivalences rigides entre l'objectivité et la réalité, entre l'objet visé et la " cause " des phénomènes, entre (...) l'invariant et l'en-soi, entre la pratique structurée de la recherche et la préexistence des structures. Et les anti-réalistes, qui adhéraient à la surface des " faits ", des opérations et des interactions sociales, n'ignorent plus les projets, les engagements et les valeurs. Ni les uns ni les autres ne se satisfont désormais d'un strict dualisme entre le donné et le construit. La voie s'en trouve dégagée pour une réappréciation des " étrangetés " de la mécanique quantique : elles ne témoigneraient pas de la distance excessive qui nous sépare du réel ; elles ne nous contraindraient pas davantage à l'agnosticisme. Elles sont peut-être le signe ambigu mais récurrent de l'aveuglante proximité du réel. Reprenant en partie certains de ses propres travaux de recherche, Michel Bitbol appuie ces orientations sur des études de cas concernant l'atomisme, le " vide quantique ", le hasard, la naissance des théories physiques du XXe siècle et le concept d' " état relatif ". (shrink)