Does thermodynamics have a reversibility problem? I argue that it does not. Insofar as thermodynamics exhibits an arrow of time, it does so due to a failure of conservation or special initial conditions, which are exactly the circumstances under which statistical mechanics exhibits an arrow of time. The arrows of thermodynamics and of statistical mechanics are therefore aligned, and so pose no obstacle to the reduction of thermodynamics to statistical mechanics.

Deep brain stimulation (DBS) is frequently described as a ‘reversible’ medical treatment, and the reversibility of DBS is often cited as an important reason for preferring it to brain lesioning procedures as a last resort treatment modality for patients suffering from treatment-refractory conditions. Despite its widespread acceptance, the claim that DBS is reversible has recently come under attack. Critics have pointed out that data are beginning to suggest that there can be non-stimulation-dependent effects of DBS. Furthermore, we lack long-term (...) data about other potential irreversible effects of neuromodulation. This has considerable normative implications for comparisons of DBS and brain lesioning procedures. Indeed, Devan Stahl and colleagues have recently argued that psychiatric DBS should be subject to the same legal safeguards as other forms of psychosurgery, supporting their position by forcibly criticising the claim that DBS is reversible. In this paper, I respond to these criticisms by first clarifying the descriptive and evaluative elements of the reversibility claim that supporters of DBS might invoke, and the different senses of ‘reversibility’ that we might employ in discussing the effects of medical procedures. I go on to suggest that it is possible to defend a nuanced version of the reversibility claim. To do so, I explain how DBS has some effects that are stimulation dependent in the short term, and argue that these effects can have significant normative implications for patient well-being and autonomy. I conclude that we should not abandon a nuanced version of the reversibility claim in the DBS debate. (shrink)

A key objective of the law in the assessment of decision-making capacity in clinical settings is to allow clinicians and judges to avoid making value judgements about the reasons that patients use to refuse treatment. This paper advances two lines of argument in respect of this objective. The first is that authorities cannot rationally avoid significant evaluative judgements in the assessment of a patient’s own assessment of the facts of their case. Assessing reasoning is unavoidably value-laden. Yet the underlying motivation (...) behind clinicians’ and the law’s value-neutral aims, ie, the avoidance of undue paternalism, is worth preserving. That being so, the second line of argument will try to show that that underlying motivation is better served in a limited range of cases by embedding a ‘reversibility standard’ in the assessment process so that the patient can, if they wish, and in due course, bring about the consequences that they were prevented from realising as a result of a determination of incapacity. (shrink)

Does thermodynamics have a reversibility problem? I argue that it does not. Insofar as thermodynamics exhibits an arrow of time, it does so due to a failure of conservation or special initial conditions, which are exactly the circumstances under which statistical mechanics exhibits an arrow of time. The arrows of thermodynamics and of statistical mechanics are therefore aligned, and so pose no obstacle to the reduction of thermodynamics to statistical mechanics.

Repetitiveness and reversibility have long been considered as characteristic features of scientific knowledge. In theoretical population genetics, repetitiveness is illustrated by a number of genetic equilibria realized under specific conditions. Since these equilibria are maintained despite a continual flux of changes in the course of generations (reshuffling of genes, reproduction…), it can legitimately be said that population genetics reveals important properties of invariance through transformation. Time-reversibility is a more controversial subject. Here, the parallel with classical mechanics is much (...) weaker. Time-reversibility is unquestionable in some stochastic models, but at the cost of a special, probabilistic concept of reversibility. But it does not seem to be a property of the most basic deterministic models describing the dynamics of evolutionary change at the level of populations and genes. Furthermore, various meanings of ‘reversibility’ are distinguished. In particular, time-reversibility should not be confused with retrodictability. (shrink)

Tocqueville's judgment of the role of 18 th century men of letters in the preparation of the Revolution is well known. Under their influence, “each public passion disguised itself… in philosophy; political life was violendy forced back into the literature.” Less attention is paid to Tocqueville's reflections on the rise of new theoreticians — so-called “economists or physiocrats.” Tocqueville himself admits that they were not as influential as the philosophies, but he thinks that it is in their writings “that one (...) can best study the true nature” of the Revolution. Further: “One recognizes already in their books mis revolutionary, democratic temperament we know so well. (shrink)

Recently, Ross and Woodward (2022) argued that the reversibility of an outcome – that is, whether the outcome can be undone – affects causal judgments. One prediction of their account is that reversibility affects causal judgments in latepreemption scenarios, where people typically judge that events that produce the outcome earlier are more causal than preempted alternative events that would have otherwise produced the outcome. Ross and Woodward’s account predicts that when the outcome is reversible, people would judge these (...) events similarly – as in standard overdetermination cases. In three experiments, we found no evidence that reversibility affects causal judgments in late-preemption cases. We discuss how these results affect the experimental philosophy and cognitive science of causation, causal modeling, and experimental jurisprudence. (shrink)

Intuitively, patients who suffer the permanent cessation of circulatory functioning—the cardiac criterion—are considered dead. As such, the cardiac criterion tells us what evidence counts as reliable evidence for determining death. The cardiac criterion is challenged by two principal arguments. The reversibility objection says that, for all we know, patients who suffer arrests could be resuscitated. Even so, for some donors who are declared dead by the cardiac criterion, they have their hearts transplanted and re-started. This challenges the idea that (...) the donor’s circulatory functioning ceased permanently. The second argument is that donation-after-cardiac-death [DCD] donors undergo ante-mortem procedures that are only done to benefit the recipient of the organ. This looks like one is using the donor merely as a means and therefore is disrespecting the donor. This chapter argues that permanent cessation of circulatory functioning is a reliable indicator for death and that DCD protocols can be consistent with a fundamental respect for the donor. (shrink)

In this essay I argue that proponents of deliberative democracy too quickly assume that the idea of reciprocity is the best moral foundation. I further argue that a more fundamental ground, namely that of reversibility, is overlooked, a ground that transforms the nature of deliberative interaction. Thus, my aim is to develop this alternate ground and indicate how it augments the notion of democratic reciprocity. I demonstrate how the appeal to reason by proponents of deliberative democracy is an epistemic (...) ground from which a notion of reciprocity emerges that regulates what is and is not deliberatively acceptable. I contend, however, thatsuch a reliance on this epistemic ground of reason overlooks a more fundamental ground without which reciprocity is impossible. This other ground that I develop is what I call the phenomenological ground of reversibility. (shrink)

This book focuses on binomials (word pairs such as heart and soul, rich and poor, or if and when), and in particular on the degree of reversibility that English binomials demonstrate. Detailed and innovative corpus linguistic analyses investigate the correlates of the degree of reversibility, linguistic constraints that influence the ordering and reversibility of binomials and the diachronic development of reversibility. In addition, judgment data are analyzed for their convergence and divergence with corpus data regarding degrees (...) of reversibility. The book thus establishes reversibility as a complex characteristic of the binomial construction, at the same time throwing light on general questions in phraseology, lexicalization, language structure and language processing. (shrink)

In summary, the question of how to construe the procedure called reversibility cannot be given an absolute answer. No one moral interpretation of the principle is universally applicable, that is, applicable to all moral issues. The decision concerning which to apply cannot be made a priori, but only in context - that is, only when we are faced with a particular moral problem. Moreover, there appears to be no rule which would enable us to choose which version is correct (...) in a particular case. It is a matter of judgment.That the various versions represent a moral progression from lower to higher constructions is debatable. We have seen that the altruism of reversibility3 - the ethic of care - may recommend itself in some personal relations to the point of making either version of reversibility4 irrelevant. Similarly, it is not clear that reversibility3 is always higher than reversibility2. For example, parents in trying to decide what is morally best for a young child should often - in the spirit of the second construction - substitute the judgment of their mature selves for the judgment of the immature self of the child. Moreover, this substitution may not be justifiable in terms of either utility or autonomy.If I seem to have ignored reversibility1 in this discussion that is because I consider it outside morality: it is, if anything, a principle of self-interested calculation. If Baier is correct in holding that we teach children to think morally when we get them to take the standpoint of others, that requires, I believe, getting them beyond the stage of crude reciprocity. If Piaget and Kohlberg are correct in their developmental claims, we cannot immediately teach children reversibility4 but must help them progress through the other two versions. There is some basis for thinking that children can transcend egoism and sympathize with others much earlier than Kohlberg allows - an important consideration in the development of a system of moral education. That point has been pursued by Michael Pritchard in his critique of Kohlberg. Pritchard, p 44. My point is a different one: even granting Kohlberg's theory of development (which asserts, for example, that a particular cognitive ability is required to think like a Kantian), it does not follow that the moral thinking which accompanies the highest cognitive stage is morally superior to the moral thinking which accompanies the lesser cognitive stages. That it is cognitively easier to master reversibility3 than reversibility4 does not settle the question of which is morally superior. Rather than arguing about which moral version of reversibility is morally best- a pointless debate if the desirability of a version is understood as contingent upon appropriateness with respect to context - we should instead celebrate the richness of the concept of reversibility. In teaching students the moral point of view by getting them to put themselves in another's place, we would not be asking them to master a rigid formula, but rather to be sensitive to the decisional context and to make a thoughtful judgment about which version of reversibility is most appropriate to that context. We would not be teaching them either moral relativism or moral absolutism, but the complexity of trying to make a moral decision by applying an ancient and philosophically rich ethical principle. (shrink)

Standard descriptions of thermodynamically reversible processes attribute contradictory properties to them: they are in equilibrium yet still change their state. Or they are comprised of non-equilibrium states that are so close to equilibrium that the difference does not matter. One cannot have states that both change and no not change at the same time. In place of this internally contradictory characterization, the term “thermodynamically reversible process” is here construed as a label for a set of real processes of change involving (...) only non-equilibrium states. The properties usually attributed to a thermodynamically reversible process are recovered as the limiting properties of this set. No single process, that is, no system undergoing change, equilibrium or otherwise, carries those limiting properties. The paper concludes with an historical survey of characterizations of thermodynamically reversible processes and a critical analysis of their shortcomings. (shrink)

In his recent book, Time and Chance, David Albert claims that by positing that there is a uniform probability distribution defined, on the standard measure, over the space of microscopic states that are compatible with both the current macrocondition of the world, and with what he calls the “past hypothesis”, we can explain the time asymmetry of all of the thermodynamic behavior in the world. The principal purpose of this paper is to dispute this claim. I argue that Albert's proposal (...) fails in his stated goal—to show how to use the time‐reversible dynamics of Newtonian physics to “underwrite the actual content of our thermodynamic experience” (Albert 2000, 159). Albert's proposal can satisfactorily explain why the overall entropy of the universe as a whole is increasing, but it does not and cannot explain the increasing entropy of relatively small, relatively short‐lived systems in energetic isolation without making use of a principle that leads to reversibility objections. (shrink)

The arguments advanced in this paper are the following. Firstly, that just as Trevarthen’s three subjective/intersubjective levels, primary, secondary, and tertiary, mapped out different modes of access, so too response is similarly structured, from direct primordial responsiveness, to that informed by shared pragmatic concerns and narrative contexts, to that which demands the distantiation afforded by representation. Secondly, I propose that empathy is an essential mode of intentionality, integral to the primary level of subjectivity/intersubjectivity, which is crucial to our survival as (...) individuals and as a species. Further to this last point, I argue that empathy is not derived on the basis of intersubjectivity, nor does it merely disclose intersubjectivity, rather it is constitutive of intersubjectivity at the primary level. Empathy is a direct, irreducible intentionality separable in thought from the other primary intentional modes of perception, rationality, memory and imagination, but co-arising with these. In regard to the inter-personal level, the concrete relations with others, primary empathy is both the ground for the possibility of the secondary manifestations—pity, sympathy, perspective taking, etc., and motivates them. Thirdly, it is the movement in the core of subjectivity initially generated by shifting attention between the ‘I’ and ‘we’ perspectives and later ‘solidified’ through affect to become shifting identification, which opens up the intersubjective domain. So we can affirm that we are not only born into sociality but our sociality goes to the roots of our being as Husserl, Heidegger and Merleau-Ponty have claimed. (shrink)

It is commonly thought that the statistical mechanical reversibility objection implies that our putative records of the past are more likely to have arisen as spontaneous fluctuations from equilibrium states than through causal processes that correctly indicate past states of affairs. Hence, so the story goes, without some further assumption that solves the reversibility objection, such as the past hypothesis, all our beliefs about the past would almost surely be false. This claim is disputed and it is argued (...) that at least some of our records of the past can and should be thought to be veridical because the intentional contents of records are not included as part of their statistical mechanical description. The fact that the present state of the world around us coheres so well with the way we would expect it to be if our records were veridical provides good evidence for the claim that they are produced via a common causal structure. (shrink)

We agree with Nielsen Busch and Mjaaland’s (2023) assessment that the Dead Donor Rule (DDR) should be viewed as an essential requirement of the organ donation process, and that the essence of the r...

Physicists routinely claim that the fundamental laws of physics are 'time symmetric' or 'time reversal invariant' or 'reversible'. In particular, it is claimed that the theory of quantum mechanics is time symmetric. But it is shown in this paper that the orthodox analysis suffers from a fatal conceptual error, because the logical criterion for judging the time symmetry of probabilistic theories has been incorrectly formulated. The correct criterion requires symmetry between future-directed laws and past-directed laws. This criterion is formulated and (...) proved in detail. The orthodox claim that quantum mechanics is reversible is re-evaluated. The property demonstrated in the orthodox analysis is shown to be quite distinct from time reversal invariance. The view of Satosi Watanabe that quantum mechanics is time asymmetric is verified, as well as his view that this feature does not merely show a de facto or 'contingent' asymmetry, as commonly supposed, but implies a genuine failure of time reversal invariance of the laws of quantum mechanics. The laws of quantum mechanics would be incompatible with a time-reversed version of our universe. (shrink)

The libertarian attribute of Thaler and Sunstein’s nudge theory (Nudge: improving decisions about health, wealth, and happiness. Yale University Press, New Haven, 2008) is one of the most important features for its candidature as a new model for public policy-making. It relies on the reversibility of choices made under the influence of nudging. Since the mind is articulated into two systems, the choice taken by System 1 is always reversible because it can be overridden by the deliberative and corrective (...) role of System 2. This article does not aim to criticise the whole theory of nudge and neither to assess its practical efficacy as a policy-making tool. Rather it intends to show that there are doubts that the specific claim of reversibility is correct for a subset of nudges called “System 1 nudges” (Sunstein in The ethics of influence, Cambridge University Press, Cambridge, 2016). And that therefore, in this case, the libertarian claim seems little justified. The thrust of my argument contests the truth of the main pillar of the libertarian claim, namely the dual-process theory of mind. I will show that even the minimal version of dual reasoning, namely the Type 1 and Type 2 processes proposed by Evans and Stanovich (Perspect Psychol Sci 8(3):223–241, 2013), is weakened by psychological and neural data. (shrink)

Reverse mathematics is a program in mathematical logic that seeks to give precise answers to the question of which axioms are necessary in order to prove theorems of "ordinary mathematics": roughly speaking, those concerning structures that are either themselves countable, or which can be represented by countable "codes". This includes many fundamental theorems of real, complex, and functional analysis, countable algebra, countable infinitary combinatorics, descriptive set theory, and mathematical logic. This entry aims to give the reader a broad introduction to (...) the history, methodology, and results of the reverse mathematics program, with a particular focus on its connections to foundational programs such as finitism, constructivism, and predicativism. (shrink)

The concept of sovereignty shapes our understanding of the world. Yet our current understanding of sovereignty conflates delegation of authority with loss of sovereignty. Delegation is relatively cheap, quick, and leads to an assured outcome; it’s an affirmation of sovereignty. Use of force, however, is required to regain lost sovereignty. I propose a definition of sovereignty that draws a clear distinction between sovereignty and delegated authority. Adopting this definition shows that sovereignty applies across time and space, it is indivisible, institutions (...) do not place permanent constraints on supreme authority, and popular sovereignty is not a well-grounded concept. (shrink)

This paper is about Sobel sequences, which are sequences of counterfactuals that supposedly display two interesting properties: first, they are consistent, as accounted for by the famous Lewis-Stalnaker analysis; but second, they are not consistent in the reverse order, which is not accounted for by Lewis-Stalnaker. I argue that there has been an empirical oversight in the literature on these sequences: there are consistent sequences, and there are irreversible sequences, but no sequence is both. The Lewis-Stalnaker theory neatly captures Sobel (...) sequences, and also captures the inconsistency of Lewis sequences. But there is still a dynamic asymmetry at work with Lewis sequences, which I account for by appeal to the pragmatic phenomenon of imprecision. Lewis sequences seem consistent because they do not belie factual disagreements, but rather metalinguistic disagreements about how precise to be. This also accounts for their irreversibility—such metalinguistic disagreements about the standard of precision are only possible in one direction, as famously observed by Lewis, who observed them in discourses not containing counterfactuals. (shrink)

Hong Kong is undergoing two overlapping crises: social unrest over anti-government protests, and COVID-19. The media has linked these events in both objective and subjective ways. While some liken the social unrest to COVID-19, others do the opposite. This is an intriguing real-world instance of source-target reversibility with interchangeable source and target resulting in two apt variants. This paper reports a survey study of the links between crisis perceptions and the aptness of metaphor variants. Participants (N = 93) rated (...) 30 matched items on the effects of both crises on trust in governance, interpersonal relations, the economy, physical/mental health, and Hong Kong’s future. This determined, for each participant, a correlation coefficient reflecting perceived structural similarity, and absolute/raw difference scores reflecting perceived substantive similarity of the crises. They then explained which (or neither) of two constructed headlines depicting the SOCIAL UNREST as COVID-19 or COVID-19 as the SOCIAL UNRESTwas more apt. Logistic regression analyses showed that i) metaphor aptness was predictable from structural but not substantive similarity, and ii) the worse crisis was preferred as source domain, but only for its more experientially concrete aspects. The study exemplifies socio-culturally situated’ theoretical investigation and how metaphor research can shed light on crisis perceptions. (shrink)

This essay seeks to supplement Arnie Naess’s avowed project of replacing the often cited model of “humans and environment,” which retains a dualistic and anthropocentric connotation, with the articulation of a “relational total-field image” of human being’s insertion in the planetary field of energy and becoming. In response to the interview “Here I Stand” in which Naess rejects Merleau-Ponty’s ontology, this essay details the ways in which Merleau-Ponty provides the kind of ontology that Naess requires for his deep ecology. Naess’s (...) use of Hindu terms and metaphysics is shown to be at odds with his descriptions of human’s relations with the world. Much of the essay critiques as well Naess’s rejection of poetic language as inadequate to the philosophical task of articulating the human-world intertwining. Using Merleau-Ponty’s work, the need for the poetic as uniquely articulating “the flesh of the world” and “reversibility” is described, hopefully showing that deep ecology’s goal of making people feel their insertion in the world’s field of becoming can only occur through inaugurating poetic uses of language. (shrink)

ArgumentIn 1877, a young mathematician named Joseph Boussinesq presented amémoireto theAcadémiedes sciences which demonstrated that some differential equations may have more than one solution. Boussinesq linked this fact to indeterminism and to a possible solution to the free will versus determinism debate. Boussinesq's main interest was to reconcile his philosophical and religious views with science by showing that matter and motion do not suffice to explain all there is in the world. His argument received mixed criticism that addressed both his (...) philosophical views and the scientific content of his work, pointing to the physical “realisticness” of multiple solutions. While Boussinesq proved to be able to face the philosophical criticism, the scientific objections became a serious problem, thus slowly moving the focus of the debate from the philosophical plane to the scientific one. This change of perspective implied a wide discussion on topics such as instability, the sensitivity to initial conditions, and the conservation of energy. The Boussinesq debate is an example of a philosophically motivated debate that transforms into a scientific one, an example of the influence of philosophy on the development of science. (shrink)

Pure Land Buddhism ascribes to Amida some of the roles ascribed to God by Whitehead. The failure of Whiteheadians to clarify how God can play these roles also leaves doubtful the claim of Pure Land Buddhism. On the other hand, Whitehead’s emphasis on perpetual perishing reinforces the original Buddhist teaching of impermanence and together they provide the basic insight for authentic life.

The COVID-19 pandemic presents unprecedented challenges to public health decision-making. Specifically, the lack of evidence and the urgency with which a response is called for, raise the ethical challenge of assessing how much (and what kind of) evidence is required for the justification of interventions in response to the various threats we face. Here we discuss the intervention of introducing technology that aims to trace and alert contacts of infected persons—contact tracing (CT) technology. Determining whether such an intervention is proportional (...) is complicated by complex trade-offs and feedback loops. We suggest that the resulting uncertainties necessitate a precautionary approach. On the one hand, precautionary reasons support CT technology as a means to contribute to the prevention of harms caused by alternative interventions, or COVID-19 itself. On the other hand, however, both the extent to which such technology itself present risks of serious harm, as well as its effectiveness, remain unclear. We therefore argue that a precautionary approach should put reversibility of CT technology at the forefront. We outline several practical implications. (shrink)

The idea that infant participation in research is achievable by researchers ‘voicing’ infants’ experiences and ‘perspectives’ is a central feature of current moves towards participatory research. In this article we offer an alternative. Specifically, we suggest a different point of reference than infants’ own experiences and ‘perspectives’; namely, the encounter between researcher and infant as it unfolds in practice. Drawing from a large-scale study of infants in family day care, and Merleau-Ponty’s notions of écart and reversibility, we articulate the (...) possibility that infants’ participation in research encounters may be felt by researchers in the ways that infants evoke embodied responses. Drawing on Dillon’s ethics of particularity, which builds upon écart and reversibility, we discuss the idea that researchers’ embodied responses to infants provoke possibilities for ethical reflection, which can afford new ways of ‘going on’. We propose that space may be created for infants to influence ECEC practice when researchers attend to their own embodied responses to infants during the research encounter; and to the factors that may diminish infants’ capacities to affect such responses. (shrink)

This book presents reverse mathematics to a general mathematical audience for the first time. Reverse mathematics is a new field that answers some old questions. In the two thousand years that mathematicians have been deriving theorems from axioms, it has often been asked: which axioms are needed to prove a given theorem? Only in the last two hundred years have some of these questions been answered, and only in the last forty years has a systematic approach been developed. In Reverse (...) Mathematics, John Stillwell gives a representative view of this field, emphasizing basic analysis--finding the "right axioms" to prove fundamental theorems--and giving a novel approach to logic. Stillwell introduces reverse mathematics historically, describing the two developments that made reverse mathematics possible, both involving the idea of arithmetization. The first was the nineteenth-century project of arithmetizing analysis, which aimed to define all concepts of analysis in terms of natural numbers and sets of natural numbers. The second was the twentieth-century arithmetization of logic and computation. Thus arithmetic in some sense underlies analysis, logic, and computation. Reverse mathematics exploits this insight by viewing analysis as arithmetic extended by axioms about the existence of infinite sets. Remarkably, only a small number of axioms are needed for reverse mathematics, and, for each basic theorem of analysis, Stillwell finds the "right axiom" to prove it. By using a minimum of mathematical logic in a well-motivated way, Reverse Mathematics will engage advanced undergraduates and all mathematicians interested in the foundations of mathematics. (shrink)

'The arrow of time' refers to the curious asymmetry that distinguishes the future from the past. Reversing the Arrow of Time argues that there is an intimate link between the symmetries of 'time itself' and time reversal symmetry in physical theories, which has wide-ranging implications for both physics and its philosophy. This link helps to clarify how we can learn about the symmetries of our world, how to understand the relationship between symmetries and what is real, and how to overcome (...) pervasive illusions about the direction of time. Roberts explains the significance of time reversal in a way that intertwines physics and philosophy, to establish what the arrow of time means and how we can come to know it. This book is both mathematically and philosophically rigorous yet remains accessible to advanced undergraduates in physics and the philosophy of physics. This title is also available as Open Access on Cambridge Core. (shrink)

Just over 20 years ago, molecular biologists Leonie Ringrose and Renato Paro published an article with a provocative title, “Remembering Silence”, in BioEssays. The article focused on how epigenetic elements could return to their silent state, operationally defined as their epigenetic status before their modulation by experimental or environmental factors. Though Ringrose and Paro's article was on fruit flies and factors affecting embryological growth, the article asked a question of considerable importance to rapidly expanding research in neuroepigenetics on the correlation (...) between trauma and neuropsychiatric risk: If you experience a traumatic event and, as a result, acquire an epigenetic trait that is considered pathological, can you free yourself of that trait? Ultimately, we are interested in how a return to silence is envisioned in neuroepigenetics research, how interventions purported to bring about that silence might function, and what this might mean for people who live in the aftermath of trauma. (shrink)