An overview of the current epistemic literature concerning conspiracy theories, as well as indications for future research avenues on the topic.

Lexical ambiguity can be syntactic if it involves more than one grammatical category for a single word, or semantic if more than one meaning can be associated with a word. In this article we discuss the application of a Bayesian‐network model in the resolution of lexical ambiguities of both types. The network we propose comprises a parsing subnetwork, which can be constructed automatically for any context‐free grammar, and a subnetwork for semantic analysis, which, in the spirit of Fillmore's (1968) case (...) grammars, seeks to fulfill the required cases of all candidates for verb of the sentence. Solving for the highest joint probability of the variables conditioned upon the evidences to the network yields the most likely candidate with its meaning, along with its cases and respective meanings. This is achieved by fixing the values of all evidence nodes concurrently, and then performing a stochastic simulation in which the remaining nodes are updated probabilistically with a high degree of parallelism. The process of disambiguation is directed neither by the syntax nor the semantics, but rather by the interrelation between the two subnetworks. The use of a Bayesian‐network model allows us to express this interrelation between the two subnetworks and among their constituents in a rather direct and rigorous way that, in connection with the convergence properties of the stochastic simulation, reveals a very robust model. (shrink)

In current dairy farming it is possible to run a profitable farm without having to adapt the system to the needs of dairy cows. In such systems the interests of the farmer and animals often diverge. Consequently, specific animal welfare problems occur. Foot disorders in dairy cattle are an illustrative example resulting from the specific methods of housing and management in current dairy farming. Foot disorders and the resulting lameness are considered the most important welfare problem in dairy farming. However, (...) these foot disorders not only typify welfare problems related to certain housing systems, but they also lead to the premature culling of cows. The assessment of the impact of foot disorders on the welfare of dairy cows raised the question of whether premature culling affects animal welfare since it affects the longevity of a cow. We argue that this aspect of longevity is morally relevant as an animal welfare issue. In this paper we aim to explore whether longevity is both (a) a morally relevant aspect in the discussion on killing animals and (b) a constitutive element of animal welfare. In other words, we aim to explore whether longevity is an independent moral argument in an animal welfare discussion. We claim that longevity is not merely important as an indicator of animal welfare, but is also a constitutive element of animal welfare. We argue that we need a more integrated approach to animal welfare and that an assessment that includes the aspect of time is necessary. This view involves a shift from views on animal welfare in terms of functioning or feeling well to a view on animal welfare that includes the aspect of natural living in which species-specific development is important. To show the impact of these points of view, we look at the practical implications for choices concerning the management of foot disorders in dairy cattle. (shrink)

Health care professionals who travel from their home countries to participate in humanitarian assistance or development work experience distinctive ethical challenges in providing care and services to populations affected by war, disaster or deprivation. Limited information is available about organizational practices related to preparation and support for health professionals working with non-governmental organizations. In this article, we present one component of the results of a qualitative study conducted with 20 Canadian health care professionals who participated in international aid work. The (...) findings reported here relate to expatriate clinicians’ experiences and perceptions of ethics preparation, training and support. The strategies examined include pre-departure training and preparation, in-field supports and retrospective debriefing of ethical issues. Participants experienced a range of training and supports as beneficial for addressing ethical challenges in humanitarian assistance and development work. Participants also expressed ambivalence or scepticism about the benefits offered by specific modalities. This analysis can contribute to informing discussions of how organizations and individual practitioners can best develop, implement and utilize ethics training and support for international aid work. (shrink)

On September 18, 1995, the U.S. Court of Appeals for the Seventh Circuit handed down a decision in Blue Cross & Blue Shield United of Wisconsin v. Marshfield Clinic ) that sets two important precedents regarding the status of health maintenance organizations under antitrust law. Chief Judge Posner, writing for the court, concluded that HMOs do not constitute a market separate from the general market for medical services and that agreements, between HMOs in a region, to operate in separate areas (...) constitute a prohibited form of market splitting.This case primarily involves two HMOs in north central Wisconsin: one a subsidiary of Blue Cross, the other a subsidiary of the Marshfield Clinic. The Blue Cross HMO claimed that the Marshfield HMO had an illegal monopoly in the region's HMO market and therefore violated the Sherman Act ). (shrink)

This paper examines whether a classical model could be translated into a PDP network using a standard connectionist training technique called extra output learning. In Study 1, standard machine learning techniques were used to create a decision tree that could be used to classify 8124 different mushrooms as being edible or poisonous on the basis of 21 different Features (Schlimmer, 1987). In Study 2, extra output learning was used to insert this decision tree into a PDP network being trained on (...) the identical problem. An interpretation of the trained network revealed a perfect mapping from its internal structure to the decision tree, representing a precise translation of the classical theory to the connectionist model. In Study 3, a second network was trained on the mushroom problem without using extra output learning. An interpretation of this second network revealed a different algorithm for solving the mushroom problem, demonstrating that the Study 2 network was indeed a proper theory translation. (shrink)

Many analogies exist between the process of evolution by natural selection and of learning by reinforcement and punishment. A full extension of the evolutionary analogy to learning to include analogues of the fitness, genotype, development, environmental influences, and phenotype concepts makes possible a single theory of the learning process able to encompass all of the elementary procedures known to yield learning.

Hull et al.'s analysis of operant behavior in terms of interaction and replication does not seem consistent with a genuine selection model. The putative replicators do not replicate, and the overall process is more reminiscent of directed mutation than of natural selection. General analogies between natural selection and operant reinforcement are too superficial to be of much scientific use.

Pitcher has taken upon himself the task of refining and defending the thesis that sense perception is the acquiring of true beliefs concerning particular facts about one's environment, by means of the senses. The book is divided into four parts, the first part being a critical treatment of the sense-data theories via an examination of several of the major arguments traditionally forwarded in defense of the view. The theory advocated by the author is presented in the second part, where the (...) view is first stated in unpolished form and gradually refined and qualified as problems and objections are dealt with. Any philosophical theory of perception, the author maintains, is related to the empirical sciences in that its task is to render intelligible the facts about perception, as uncovered by the relevant sciences. Thus, in the third part of the book, some recent experiments in the psychology of perception are discussed in relation to the theory of perception held by the author. In the final part of the book, Pitcher discusses color perception, since the perception of colors seems, at first glance, to present a problem for his theory. If a dispositional analysis is given for perceptual belief, what behavior is peculiar to the perception of a color? An interesting discussion of the primary-secondary quality contrast follows Pitcher's solution to this problem. Though the author does not claim originality for the theory of perception he offers, there is still much to be said for his treatment of the materials presented.--R. L. M. (shrink)

A systematic account of explanation and meaning, on an introductory level. The book is designed not only for students who are primarily interested in philosophy, but also for students whose primary interests may lie in the physical or social sciences, literature, or history. There are fifteen relatively brief chapters, the first eight of which are concerned with the concept of explanation while the remaining seven chapters deal with the concept of meaning. The author begins his treatment of explanation by dismissing (...) as fruitless disputes over what a 'real' explanation must be. Instead, he proposes to examine different types of explanation in order to determine their differences and the relative importance of their differences. "Scientific Explanation," "What-explanations," and "Reason-giving Explanation" are then distinguished and discussed in the early chapters, and this is followed with chapters on historical explanation and explanation in literary criticism. In the remaining chapters on meaning, the author maintains the view that meanings are not a sort of thing, mental or physical. He supports this thesis through his criticisms of causal theories of meaning, "Fido"-Fido theories of meaning, and theories which attempt to identify the meaning of a word with a mental event or an essential definition. The author favors identifying the meaning of a work with its use and deals with some of the problems connected with this view. A list of additional references for each chapter is provided at the end of the book. Though the book is primarily a systematic account of explanation and meaning, a variety of issues from different areas of contemporary philosophical concern are touched upon along the way. These issues concern, for example, natural laws, explaining human behavior, the nature of historical explanation, interpretation in literature, definition, synonymy, and metaphor. This is a clearly written introduction to contemporary philosophy.--R. L. M. (shrink)

Von Wright describes his position as "teleological" yet distinguishes it from Aristotle's "notion of the good of man relative to a notion of the nature of man," by likening it to that of the utilitarian tradition. There is painstaking attention to the staggering diversity of functions of "good" and related words, and an examination of instrumental, technical, medical, hedonic and utilitarian goodness. Von Wright regards the moral sense of "good" as derivative and defines it in terms of the beneficial, a (...) sub-class of Utilitarian Goodness. Chapters on Virtue, "Good" and "Must," Duty, Justice are included. There are rather few references to other works, very many distinctions, and an Index which includes, among others, the word "all right."--R. L. M. (shrink)

This volume contains fourteen essays, all of which were written by Ebersole over a period of seven years, on various epistemological problems. A few of the essays have appeared before as journal articles, but the bulk of the essays are here printed for the first time. The essays deal with three principle topics: sense-datum theories of perception, memory and the past, and the possibility of knowledge of existence without experience. In style and approach, the essays can be characterized as belonging (...) to the school of analytic philosophy, dealing with philosophical problems with an emphasis on the use and function of relevant linguistic expressions. Although some of the essays are interesting, readers of Wittgenstein will find the material all too familiar.--R. L. M. (shrink)

BackgroundLarge-scale, centralized data repositories are playing a critical and unprecedented role in fostering innovative health research, leading to new opportunities as well as dilemmas for the medical sciences. Uncovering the reasons as to why citizens do or do not contribute to such repositories, for example, to population-based biobanks, is therefore crucial. We investigated and compared the views of existing participants and non-participants on contributing to large-scale, centralized health research data repositories with those of ex-participants regarding the decision to end their (...) participation. This comparison could yield new insights into motives of participation and non-participation, in particular the behavioural change of withdrawal.MethodsWe conducted 36 in-depth interviews with ex-participants, participants, and non-participants of a three-generation, population-based biobank in the Netherlands. The interviews focused on the respondents’ decision-making processes relating to their participation in a large-scale, centralized repository for health research data.ResultsThe decision of participants and non-participants to contribute to the biobank was motivated by a desire to help others. Whereas participants perceived only benefits relating to their participation and were unconcerned about potential risks, non-participants and ex-participants raised concerns about the threat of large-scale, centralized public data repositories and public institutes, such as social exclusion or commercialization. Our analysis of ex-participants’ perceptions suggests that intrapersonal characteristics, such as levels of trust in society, participation conceived as a social norm, and basic societal values account for differences between participants and non-participants.ConclusionsOur findings indicate the fluidity of motives centring on helping others in decisions to participate in large-scale, centralized health research data repositories. Efforts to improve participation should focus on enhancing the trustworthiness of such data repositories and developing layered strategies for communication with participants and with the public. Accordingly, personalized approaches for recruiting participants and transmitting information along with appropriate regulatory frameworks are required, which have important implications for current data management and informed consent procedures. (shrink)

Formal training in clinical ethics must become a central part of residency curricula to prepare practitioners to manage the ethical dimensions of patient care. Residency educators must ground their teaching in an understanding of the conceptual, biomedical, and psychosocial aspects of the important ethical issues that arise in that field of practice. Four aspects of professional competence in clinical ethics provide a useful framework for curricular planning. The physician should learn to: (1) recognize ethical issues as they arise in clinical (...) care and identify hidden values and unacknowledged conflicts; (2) think clearly and critically about these issues in ways that lead to ethically justifiable courses of action; (3) apply those practical skills needed to implement an ethically justifiably course of action; and (4) judge when the management of a clinical situation requires consultation with individuals or institutional bodies with additional expertise or authority. We argue that these practical goals can be accomplished with a relatively modest emphasis on the theoretical aspects of medical ethics. (shrink)