Two ways of describing a group are considered. 1. A group is finite-automaton presentable if its elements can be represented by strings over a finite alphabet, in such a way that the set of representing strings and the group operation can be recognized by finite automata. 2. An infinite f.g. group is quasi-finitely axiomatizable if there is a description consisting of a single first-order sentence, together with the information that the group is finitely generated. In the first part of the (...) paper we survey examples of FA-presentable groups, but also discuss theorems restricting this class. In the second part, we give examples of quasi-finitely axiomatizable groups, consider the algebraic content of the notion, and compare it to the notion of a group which is a prime model. We also show that if a structure is bi-interpretable in parameters with the ring of integers, then it is prime and quasi-finitely axiomatizable. (shrink)

We describe a strongly minimal theory S in an effective language such that, in the chain of countable models of S, only the second model has a computable presentation. Thus there is a spectrum of an -categorical theory which is neither upward nor downward closed. We also give an upper bound on the complexity of spectra.

How many factors, i.e. departures from normality, are necessary to explain a delusion? Maher’s classic one-factor theory argues that the only factor is the patient’s anomalous experience, and a delusion arises as a normal explanation of this experience. The more recent two-factor theory, on the other hand, contends that a second factor is also needed, with reasoning abnormality being a potential candidate, and a delusion arises as an abnormal explanation of the anomalous experience. In the past few years, although there (...) has been an increasing number of scholars offering a variety of arguments in defence of Maher’s one-factor theory, these arguments have not been adequately addressed by two-factor theorists. This paper aims to address this gap by critically examining the arguments on three crucial issues: the intelligibility of delusions, the dissociation between anomalous experiences and delusions, and the empirical evidence of a second factor. I will argue that the Maherian notion of anomalous experience is not sufficient for explaining delusions and the two-factor theory is on the right track in its search for the missing factor in the aetiology of delusions. (shrink)

According to a bodily view of pain, pains are objects which are located in body parts. This bodily view is supported by the locative locutions for pain in English, such as that “I have a pain in my back.” Recently, Liu and Klein (Analysis, 80(2), 262–272, 2020) carry out a cross-linguistic analysis, and they claim that (1) Mandarin has no locative locutions for pain and (2) the absence of locative locutions for pain puts the bodily view at risk. This paper (...) rejects both claims. Regarding the philosophical claim, I argue that a language without locative locutions for pain only poses a limited challenge to the bodily view. Regarding the empirical claim, I identify the possible factors which might have misled Liu and Klein about the locative locutions for pain in Mandarin, and argue that Mandarin has a wide range of locative locutions for pain by conducting a corpus analysis. I conclude that compared to English, Mandarin lends no less, if not more, support to the bodily view of pain. (shrink)

We all have experiences in which it “seems clear” to us that something is true. This kind of clear experience can play significant roles in determining whether we believe something to be true. But what are the significant roles? So far, the literature has focused on optimal cases where a person's clear experience might provide prima facie justification for their belief. This article will develop the hypothesis that, in less optimal cases, these clear experiences can be epistemically damaging. Specifically, it (...) will argue that, in certain cases, such experiences may causally compel belief even in the face of counterevidence. (shrink)

The interplay between computability and randomness has been an active area of research in recent years, reflected by ample funding in the USA, numerous workshops, and publications on the subject. The complexity and the randomness aspect of a set of natural numbers are closely related. Traditionally, computability theory is concerned with the complexity aspect. However, computability theoretic tools can also be used to introduce mathematical counterparts for the intuitive notion of randomness of a set. Recent research shows that, conversely, concepts (...) and methods originating from randomness enrich computability theory.The book covers topics such as lowness and highness properties, Kolmogorov complexity, betting strategies and higher computability. Both the basics and recent research results are desribed, providing a very readable introduction to the exciting interface of computability and randomness for graduates and researchers in computability theory, theoretical computer science, and measure theory. (shrink)

How does it come about that a person akratically believes that P, while at the same time believing that the available evidence speaks against that P? Among the current accounts, Scanlon offers an intuitive suggestion that one’s seeming experience that P may play an important role in the aetiology of their akratic belief that P. However, it turns out to be quite challenging to articulate what the role of seeming experience is. This paper will offer a novel development of Scanlon’s (...) intuitive suggestion, with a focus on clear-eyed epistemic akrasia. I will argue that the primary role of seeming experience is unlikely to act as the subject’s reason or to provide the subject with prima facie justification; instead, based on the recent work in dogmatism and Cartesian clarity, I will propose a causal account, according to which, when it seems clear to the subject that P, the seeming experience may exert a brute causal force to persistently compel the subject to believe that P. This causal account also has the advantage of helping some existing accounts to explain clear-eyed epistemic akrasia. (shrink)

Military metaphors are pervasive in biomedicine, including HIV research. Rooted in the mind set that regards pathogens as enemies to be defeated, terms such as “shock and kill” have become widely accepted idioms within HIV cure research. Such language and symbolism must be critically examined as they may be especially problematic when used to express scientific ideas within emerging health-related fields. In this article, philosophical analysis and an interdisciplinary literature review utilizing key texts from sociology, anthropology, history, and Chinese and (...) African studies were conducted to investigate the current proliferation of military metaphors. We found the use of these metaphors to be ironic, unfortunate, and unnecessary. To overcome military metaphors we propose to give them less aggressive meanings, and/or replace them with more peaceful metaphors. Building on previous authors' work, we argue for the increased use of “journey” metaphors as meaningful, cross-culturally app... (shrink)

Drawing from a wide range of primary historical and sociological sources, this book presents medical ethics in China from a Chinese-Western comparative perspective, and in doing so it provides a fascinating exploration of cultural differences and commonalities exhibited by China and the West in medicine and medical ethics. The book focuses on a number of key issues in medical ethics including: attitudes towards foetuses; disclosure of information by medical professionals; informed consent; professional medical ethics; and human rights. This careful examination (...) not only provides insights into Chinese viewpoints, but also sheds light on the appropriate methods for comparative culture and ethical research. Through its analysis, Jing-Bao Nie seeks to put forward a theory of "transcultural bioethics", an ethical paradigm which upholds the primacy of morality whilst resisting cultural stereotypes, and appreciating the internal plurality, richness, dynamism and openness of medical ethics in any culture. Medical Ethics in China will be of particular interest to students and academics in the fields of Medical Law, Bioethics and Medical Ethics as well as Chinese/Asian Studies and Comparative (Chinese-Western) Cultural Studies. (shrink)

In this paper we investigate computable models of -categorical theories and Ehrenfeucht theories. For instance, we give an example of an -categorical but not -categorical theory such that all the countable models of except its prime model have computable presentations. We also show that there exists an -categorical but not -categorical theory such that all the countable models of except the saturated model, have computable presentations.

We study and compare two combinatorial lowness notions: strong jump-traceability and well-approximability of the jump, by strengthening the notion of jump-traceability and super-lowness for sets of natural numbers. A computable non-decreasing unbounded function h is called an order function. Informally, a set A is strongly jump-traceable if for each order function h, for each input e one may effectively enumerate a set Te of possible values for the jump JA, and the number of values enumerated is at most h. A′ (...) is well-approximable if can be effectively approximated with less than h changes at input x, for each order function h. We prove that there is a strongly jump-traceable set which is not computable, and that if A′ is well-approximable then A is strongly jump-traceable. For r.e. sets, the converse holds as well. We characterize jump-traceability and strong jump-traceability in terms of Kolmogorov complexity. We also investigate other properties of these lowness properties. (shrink)

Since the early 1970s, despite popular opposition, to control the rapid growth of population the Chinese government has been carrying out the strictest and most comprehensive family planning policy in the world. In addition to contraceptive methods and sterilization, artificial abortionhas been used as an important measure of birth control under the policy. Many women have been required, persuaded, and even forced by the authorities to abort fetuses no matter how much they want to give birth.

This study focuses on the effects of socially responsible human resource management practices on female employees’ turnover intentions and the moderating effect of supervisor gender on this relationship. With a sample of 212 female employees from eight different industries in Finland, the results indicate that SR-HRM practices promoting equal career opportunities and work–family integration play a significant role in reducing women's turnover intentions. The study adds to the academic discourse of corporate social responsibility by highlighting the impact of the organizational-level (...) HRM determinants on the individual-level outcome. In addition, supervisor gender makes a difference in the studied relationship: female supervisors have a stronger and more significant impact on the relationship than male supervisors. Our findings suggest that organizational measures which support work–family integration should be taken seriously to decrease female employees’ turnover intentions. Male supervisors could adopt some gender-incongruent leadership behaviors, such as individualized emotional concern and caring when dealing with female employees. In the future, other gender combinations in the supervisor–employee relationship would merit research. (shrink)

Corlett (2019) raises two groups of challenges against the two-factor theory of delusions: One focuses on weighing “the evidence for … the two-factor theory”; the other aims to question “the logic of the two-factor theory” (p. 166). McKay (2019) has robustly defended the two-factor theory against the first group. But the second group, which Corlett believes is in many aspects independent of the first group and Darby (2019, p. 180) takes as “[t]he most important challenge to the two-factor theory raised (...) by Dr. Corlett”, has by large remained. Here I offer my two cents in response to the second group. More specifically, I argue that Corlett’s challenges to the logic of the two-factor theory, concerning modularity, double dissociation and cognitive penetration, seem to be based on some misunderstandings of the two-factor theory. (shrink)

To effectively address ageing and develop adequate eldercare needs, among others, new ethical visions are much needed. One of the ways to formulate sound ethical visions for contemporary issues is to reclaim, reinterpret and revive old moral ideas and ideals rooted in different indigenous cultural traditions. Drawing thought, wisdom and inspirations from classical Confucianism, the article offers a Confucian ethical outlook on healthy ageing and social eldercare. The popular perception of ageing in the West as well as China regards old (...) age as a period of inevitable decline. However, Kong Zi (Confucius) treats human life as an ongoing moral pilgrimage, with old age the summit of the lifelong journey. This Confucian ethical view on ageing as the culmination of a lifelong moral cultivation has various important themes. They include the primary feature of learning in healthy ageing, the essential role of social eldercare embedded in the popular Confucian norm ‘filial piety’ ( xiao), intergenerational flourishing and the necessity to respect the rights and dignity of each old person. Such a Confucian socio-ethical vision can not only help identify contemporary failings in the area of eldercare but also generate novel ideas and frameworks to help China and the world to face population ageing and elderly care in a more positive way. (shrink)

As shocking as He Jiankui's genetic experiment resulting in the world's first gene‐edited babies may have been, a socioethical inquiry into this paradigmatic case of scientific misconduct reveals its deep roots in genetic and scientific nationalism, as manifested in the widely accepted practice of yousheng (superior birth or eugenics) in China and the country's authoritarian pursuit of science superpower status. Along with eugenics, bionationalism has long been an international phenomenon. A global sociobioethics or ethical transculturalism is thus necessary to adequately (...) investigate the macrolevel sociopolitical, historical, and transnational forces, such as bionationalism, that structurally shape bioethical issues and people's responses to them, causing the systematic undermining of essential bioethical norms and the instrumentalization of human life. (shrink)

I would like to thank Sullivan-Bissett and Noordhof for their stimulating comments on my 2023 paper in Neuroethics. In this reply, I will (1) articulate some deeper disagreements that may underpin our disagreement on the nature of delusion, (2) clarify their misrepresentation of my previous arguments as a defence of the two-factor theory in particular, and (3) finally conduct a comparison between the Maherian one-factor theory and the two-factor theory, showing that the two-factor theory is better supported by evidence.

To monopolize the scientific data gained by Japanese physicians and researchers from vivisections and other barbarous experiments performed on living humans in biological warfare programs such as Unit 731, immediately after the war the United States government secretly granted those involved immunity from war crimes prosecution, withdrew vital information from the International Military Tribunal for the Far East, and publicly denounced otherwise irrefutable evidence from other sources such as the Russian Khabarovsk trial. Acting in “the national interest” and for the (...) security of the US, authorities in the US tramped justice and morality, and engaged in what the English common law tradition clearly defines as “complicity after the fact.” To repair this historical injustice, the US government should issue an official apology and offer appropriate compensation for having covered up Japanese medical war crimes for six decades. To help prevent similar acts of aiding principal offender in the future, international declarations or codes of human rights and medical ethics should include a clause banning any kind of complicity in any unethical medicine—whether before or after the fact—by any state or group for whatever reasons. (shrink)

The ideas of continental philosopher Martin Heidegger have been influential in cognitive science and artificial intelligence, despite the fact that there has been no effort to analyze these ideas empirically. The experiments reported here are designed to lend empirical support to Heidegger’s phenomenology and more specifically his description of the transition between ready-to-hand and unready-to-hand modes in interactions with tools. In experiment 1, we found that a smoothly coping cognitive system exhibits 1/fβ type positively correlated noise and that its correlated (...) character is reduced when the system is perturbed. This indicates that the participant and tool constitute a self-assembled, extended device during smooth coping and this device is disrupted by the perturbation. In experiment 2, we examine the re-organization of awareness that occurs when a smoothly coping, self-assembled, extended cognitive system is perturbed. We found that the disruption is accompanied by a change in attention which interferes with participants’ performance on a simultaneous cognitive task. Together these experiments show that a smoothly coping participant-tool system can be temporarily disrupted and that this disruption causes a change in the participant’s awareness. Since these two events follow as predictions from Heidegger’s work, our study offers evidence for the hypothesized transition from readiness-to-hand to unreadiness-to-hand. (shrink)

In order to explain delusional beliefs, one must first consider what factors should be included in a theory of delusion. Unlike a one-factor theory, a two-factor theory of delusion argues that not only anomalous experience (the first factor) but also an impairment of the belief-evaluation system (the second factor) is required. Recently, two-factor theorists have adopted various Bayesian approaches in order to give a more accurate description of delusion formation. By reviewing the progression from a one-factor theory to a two-factor (...) theory, I argue that in light of the second factor’s requirements, different proposed impairments can be unified within a consistent belief-evaluation system. Under this interpretation of the second factor, I further argue that the role of a mechanism responsible for detecting bizarreness is wrongly neglected. I conclude that the second factor is a compound system which consists of differing functional parts, one of which functions to detect bizarreness in different stages of delusion; moreover, I hold that the impairment can be one or several of these functional parts. (shrink)

The leader–member relationship has been identified as a key determinant of successful working relationships and business outcomes in China. A high-quality leader–member relationship helps managers and employees to meet the demands they face and gives them the opportunity to develop socially, emotionally and morally. Such relationships form the basis of the overall well-being and success of the organisation. This article contributes to relationally oriented leadership theories and more specifically to the leader–member exchange theory by examining the theory in the context (...) of Western expatriate managers and Chinese employees in China. The first aim of the study is to analyse the similarities and differences between the LMX theory, which owes its origins to Western corporate experience, and the social and moral norms of guanxi, a crucial element in the Chinese value system. Since Westerners and Chinese people can give different interpretations to guanxi, the second aim of the article is to discuss the ethical challenges to the Western manager arising from guanxi. The findings of this study have implications not only for China, but also for other Chinese communities where guanxi is endorsed and practised. (shrink)

Trust is indispensable not only for interpersonal relationships and social life, but for good quality healthcare. As manifested in the increasing violence and tension in patient-physician relationships, China has been experiencing a widespread and profound crisis of patient–physician trust. And globally, the crisis of trust is an issue that every society, either developing or developed, has to face in one way or another. Yet, in spite of some pioneering works, the subject of patient-physician trust and mistrust – a crucial matter (...) in healthcare especially because there are numerous ethical implications – has largely been marginalized in bioethics as a global discourse. Drawing lessons as well as inspirations from China, this paper demonstrates the necessity of a trust-oriented bioethics and presents some key theoretical, methodological and philosophical elements of such a bioethics. A trust-oriented bioethics moves beyond the current dominant bioethical paradigms through putting the subject of trust and mistrust in the central agenda of the field, learning from the social sciences, and reviving indigenous moral resources. In order for global bioethics to claim its relevance to the things that truly matter in social life and healthcare, trust should be as vital as such central norms like autonomy and justice and can serve as a potent theoretical framework. (shrink)

There exists a serious shortage of organs for transplantation in China, more so than in most Western countries. Confucianism has been commonly used as the cultural and ethical reason to explain the reluctance of Chinese and other East-Asian people to donate organs for medical purposes. It is asserted that the Confucian emphasis on xiao (filial piety) requires individuals to ensure body intactness at death. However, based on the original texts of classical Confucianism and other primary materials, we refute this popular (...) view. We base our position on the related Confucian norms of filial piety and ren (humaneness, humanity or benevolence), the tension between differentiated love and universal love, and belief in the goodness of human nature. In light of this, we argue that the Confucian ethical outlook actually calls for organ donation at an individual level, and supports an opt-out (presumed consent) system at the level of social policy. Furthermore, because the popular view is based on a number of dominant but misleading modes of thinking about cultural differences, our revisionist account of Confucian moral duties regarding organ donation has implications for developing a more adequate transcultural and global bioethics. These will be discussed and expanded upon. (shrink)

Contemporary bioethical issues are inherently cross-cultural and global in their scope. This is not surprising, as bioethical matters touch everyone in one way or another. Moral quandaries in health-care, life sciences, and biotechnology do not respect natural and human boundaries, the boundaries between and within nation-states, ethnicities, cultures, communities, and social groups. In addition, the simultaneously large-scale and intimate interactions between and within different cultures and civilizations and the rapid pace at which they change are phenomena that distinguish our times (...) from previous eras. Bioethics—as a particular domain of public discourse and an academic discipline—has thus been rapidly... (shrink)

We show that the partial order of Σ0 3-sets under inclusion is elementarily definable with parameters in the semilattice of r.e. wtt-degrees. Using a result of E. Herrmann, we can deduce that this semilattice has an undecidable theory, thereby solving an open problem of P. Odifreddi.

Extensive conflicts of interest at both individual and institutional levels are identifiable in scientific research and healthcare in China, as in many other parts of the world. A prominent new case from China is He Jiankui’s experiment that produced the world’s first gene-edited babies and that raises numerous ethical, political, socio-cultural, and transnational questions. Serious financial and other COI were involved in He’s genetic adventure. Using He’s infamous experiment as a case study, this paper explores the wider issue of financial (...) and other COI in scientific research and healthcare in China, especially institutional conflict of interest and policy-related COI. Taking a socio-ethical perspective, it examines China’s state policies and its massive efforts to transform and commercialize scientific research, the lack of policies and oversight mechanisms for regulating COI, as well as major ethical issues arising from COI including the undermining of public trust. Some practical suggestions are offered for institutional reform and institutional development so that COI, particularly ICOI, can be avoided or more effectively managed in scientific research in China. (shrink)

To investigate the phenomenon of patient–physician mistrust in China, a qualitative study involving 107 physicians, nurses and health officials in Guangdong Province, southern China, was conducted through semi-structured interviews and focus groups. In this paper we report the key findings of the empirical study and argue for the essential role of medical professionalism in rebuilding patient-physician trust. Health professionals are trapped in a vicious circle of mistrust. Mistrust leads to increased levels of fear and self-protection by doctors which exacerbate difficulties (...) in communication; in turn, this increases physician workloads, adding to a strong sense of injustice and victimization. These factors produce poorer healthcare outcomes and increasingly discontented and angry patients, escalate conflicts and disputes, and result in negative media coverage, all these ultimately contributing to even greater levels of mistrust. The vicious circle indicates not only the crisis of patient-physician relationship but the crisis of medicine as a profession and institution. Underlying the circle is the inherent conflict of interest in the healthcare system by which health professionals and hospitals have become profit-driven. This institutional conflict of interest seriously compromises the fundamental principle of medical professionalism—the primacy of patient welfare—as well as the traditional Chinese ideal of “medicine as the art of humanity”. Patient trust can be restored through rectifying this institutional conflict of interest and promoting medical professionalism via a series of recommended practical measures. (shrink)

: Since the late 1970s, American appraisals of Chinese medical ethics and Chinese responses to American bioethics range from frank criticism to warm appreciation, from refutation to acceptance. Yet in the United States as well as in China, American bioethics and Chinese medical ethics have been seen, respectively, as individualistic and communitarian. In this widely-accepted general comparison, the great variation in the two medical moralities, especially the diversity of Chinese experiences, has been unfortunately minimized, if not totally ignored. Neither American (...) bioethics nor Chinese medical ethics is a field with only one dominant way of thinking. Medical moralities in America and China--traditional and modern--have always been plural and diverse. For example, American and Chinese cultures and medical moralities both exhibit individualistic and communitarian traditions. For this reason, bioethics in general and cross-cultural bioethics in particular must be fundamentally interpretive. Interpretive cross-cultural bioethics appreciates the plurality of medical morality within any culture. It can serve as a vital means of social and cultural criticism through engaged interpretations. (shrink)

The Jordan decomposition theorem states that every function $f \colon \, [0,1] \to \mathbb {R}$ of bounded variation can be written as the difference of two non-decreasing functions. Combining this fact with a result of Lebesgue, every function of bounded variation is differentiable almost everywhere in the sense of Lebesgue measure. We analyze the strength of these theorems in the setting of reverse mathematics. Over $\mathsf {RCA}_{0}$, a stronger version of Jordan’s result where all functions are continuous is equivalent to (...) $\mathsf {ACA}_0$, while the version stated is equivalent to ${\textsf {WKL}}_{0}$. The result that every function on $[0,1]$ of bounded variation is almost everywhere differentiable is equivalent to ${\textsf {WWKL}}_{0}$. To state this equivalence in a meaningful way, we develop a theory of Martin–Löf randomness over $\mathsf {RCA}_0$. (shrink)

Two theories on the origins of COVID-19 have been widely circulating in China and the West respectively, one blaming the United States and the other a highest-level biocontainment laboratory in Wuhan, the initial epicentre of the pandemic. Both theories make claims of biological warfare attempts. According to the available scientific evidence, these claims are groundless. However, like the episodes of biological warfare during the mid-twentieth century, the spread of these present-day conspiracy theories reflects a series of longstanding and damaging trends (...) in the international scene which include deep mistrust, animosities, the power of ideologies such as nationalism, and the sacrifice of truth in propaganda campaigns. Also, the threats associated with biological warfare, bioterrorism, and the accidental leakage of deadly viruses from labs are real and growing. Thus, developing a better global governance of biosafety and biosecurity than exists at present is an urgent imperative for the international community in the broader context of a looming Cold War II. For such a governance, an ethical framework is proposed based upon the triple ethical values of transparency, trust, and the common good of humanity. (shrink)

Dans le monde de la recherche de la Chine contemporaine, il existe des points de vue représentatifs sur l’utopie du peuple. L’un est représenté par He Qing qui remet en question l’authenticité du concept de peuple en s’appuyant sur les opinions de certains chercheurs français, et le considère comme une utopie impossible, avant d’aller jusque dans la négation de la démocratie elle-même et l’approbation de l’idéal confucéen de gouverner pour le peuple. L’autre point de vue est incarné par Wang Shaoguang (...) qui, dans une série d’ouvrages et d’articles, prône une imagination parfaite du peuple à partir de l’idéal démocratique de gouverner par le peuple, et ainsi critique sévèrement la démocratie représentative occidentale comme une fausse démocratie ou une électocratie qui rejette le gouvernement par le peuple. Paradoxalement, bien que Wang Shaoguang et He Qing aient des prises de position catégoriquement opposées sur la question de savoir s’il faut soutenir la démocratie ou non, Wang finit par avoir une conception élitiste de la politique. Notre article vise donc à dresser un bilan de ces deux points de vue et de les analyser, en soulignant que l’origine de leur rejet de l’idéal démocratique repose sur une fausse imagination de l’utopie du peuple, où le peuple est considéré à tort comme une entité définie. Sur cette base, nous soutenons que l’utopie du peuple doit être reconstruite dans la perspective de l’indéfini afin de défendre une véritable démocratie. (shrink)

Music expertise is known to be beneficial for cognitive function and development. In this study, we conducted 1-year music training for school children in China. The children were assigned to music or second-language after-class training groups. A passive control group was included. We aimed to investigate whether music training could facilitate working memory development compared to second-language training and no training. Before and after the training, auditory WM was measured via a digit span task, together with the vocabulary and block (...) tests of the Wechsler Intelligence Scale for Child IV. The results of the DS task revealed superior development in the music group compared to the other groups. However, further analysis of DS forward and backward tasks indicated that the performance of the three training/non-training groups only differed significantly in DS backward scores, but not in the DS forward scores. We conclude that music training may benefit the central executive system of WM, as reflected by the DS backward task. (shrink)

Context: The dominant approach to the study of perception is representational/computational, with an emphasis on the achievements of the brain and the nervous system, which are taken to construct internal models of the world. Alternatives include ecological, embedded, embodied, and enactivist approaches, all of which emphasize the centrality of action in understanding perception. Problem: Despite sharing many theoretical commitments that lead to a rejection of the classical approach, the alternatives are characterized by important contrasts and points of divergence. Here we (...) focus on the enactive and ecological approaches, in particular, on how they construe the status of the environment and the content of perception. Method: We begin with a review of James Gibson’s ecological psychology, highlighting it as a psychology for all organisms not just humans. Against this backdrop, we consider enactivist arguments against direct perception - a central assertion of the ecological approach - and in favor of interpreting the activity of perceptual agents as a kind of construction of a perceptually meaningful world. Results: We assess the merits of this interpretation and we conclude that it cannot be grounded on fundamental principles such as thermodynamics and organism-environment mutuality. Implications: As a consequence, enactivism remains close to representationalism and entails a form of dualism. Constructivist content: We advance a criticism of the constructivist foundations of the enactive approach to perception. Perception-action mutuality at the heart of enactivism does not require mental construction; indeed, perception-action mutuality obviates construction. (shrink)

The biinterpretability conjecture for the r.e. degrees asks whether, for each sufficiently large k, the [Formula: see text] relations on the r.e. degrees are uniformly definable from parameters. We solve a weaker version: for each k ≥ 7, the [Formula: see text] relations bounded from below by a nonzero degree are uniformly definable. As applications, we show that Low 1 is parameter definable, and we provide methods that lead to a new example of a ∅-definable ideal. Moreover, we prove that (...) automorphisms restricted to intervals [d, 1], d ≠ 0, are [Formula: see text]. We also show that, for each c ≠ 0, can be interpreted in [0, c] without parameters. (shrink)

§1. Introduction. Natural sets that can be enumerated by a computable function always seem to be either actually computable or of the same complexity as the Halting Problem, the complete r.e. set K. The obvious question, first posed in Post [1944] and since then called Post's Problem is then just whether there are r.e. sets which are neither computable nor complete, i.e., neither recursive nor of the same Turing degree as K?Let be the r.e. degrees, i.e., the r.e. sets modulo (...) the equivalence relation of equicomputable with the partial order induced by Turing computability. This structure is a partial order with least element 0, the degree of the computable sets, and greatest element 1 or 0′, the degree of K. Post's problem then asks if there are any other elements of.The solution of Post's problem by Friedberg [1957] and Muchnik [1956] was followed by various algebraic or order theoretic results that were interpreted as saying that the structure was in some way well behaved:Theorem 1.1. Every countable partial ordering or even uppersemilattice can be embedded into.Theorem 1.2. For every nonrecursive r.e. degreeathere are r.e. degreesb, c < asuch thatb ∨ c = a.Theorem 1.3. For every pair of nonrecursive r.e. degreesa < bthere is an r.e. degreecsuch thata < c < b. (shrink)

:The Chinese Communist Party government has been forcefully promoting itsjihua shengyu program, known as the “one-child policy,” for more than three decades. A distinctive authoritarian model of population governance has been developed. A pertinent question to be asked is whether China’s one-child policy and the authoritarian model of population governance have a future. The answer must be no; they do not. Although there are many demographic, economic, and social rationales for terminating the one-child policy, the most fundamental reason for opposing (...) its continuation is drawn from ethics. The key ethical rationale offered for the policy is that it promotes the common social good, not only for China and the Chinese people but for the whole human family. The major irony associated with this apparently convincing justification is that, although designed to improve living standards and help relieve poverty and underdevelopment, the one-child policy and the application of the authoritarian model have instead caused massive suffering to Chinese people, especially women, and made them victims of state violence. A lesson from China—one learned at the cost of individual and social suffering on an enormous scale—is that an essential prerequisite for the pursuit of the common good is the creation of adequate constraints on state power. (shrink)

We investigate the upper semilattice Eq* of recursively enumerable equivalence relations modulo finite differences. Several natural subclasses are shown to be first-order definable in Eq*. Building on this we define a copy of the structure of recursively enumerable many-one degrees in Eq*, thereby showing that Th has the same computational complexity as the true first-order arithmetic.