The value of Plutarch’s perception of physical reality and his attitude towards the natural spectacle Plutarch was very interested in the natural world around him, not only in terms of its elementary composition and physical processes, but also with respect to its providential ordering and marvels. His writings teach us a lot about his perception of physical reality and about his attitude to the natural spectacle. He found his greatest inspiration in the ontological and epistemological framework of Plato’s Timaeus, but (...) a wide range of other authors were also of seminal interest to his project. Moreover, the highly literary value of Plutarch’s natural philosophical writings should not be underrated. It is therefore not surprising that recently scholars have started to reassess the ancient scientific value of Plutarch’s natural philosophical writings. Natural Spectaculars aims to give further impetus to this dynamic by treating several aspects of Plutarch’s natural philosophy which have remained unexplored up to now. (shrink)

ment on the same propositions, and is plagued by impossibility re- 2. What is the role of independence in judgment aggregation sults. In this paper we study the central notion of independence in..

Research on social influences often distinguishes between social and quality incentives to ascribe meaning to the value that popularity conveys. This study examines the neural correlates of those incentives through which popularity influences preferences. This research reports an functional magnetic resonance imaging experiment and a behavioral task in which respondents evaluated popular products with three focus perspectives; unspecified focus, focus on social aspects, and focus on quality. The results show that value derived with a social focus reflects inferences of approval (...) and reward value, and positively affects preferences. Value derived with a quality focus reflects inferences of quality and negatively affects preferences. This study provides evidence of two distinct inferential routes on both a neurological level, represented by different regions in the brain, and a behavioral level. These results provide the first evidence that a single popularity cue can in different ways influence the value derived from product popularity. (shrink)

We analyze the cognitive strategies underlying performance in the Number task, a Math game that requires both arithmetic fluency and mathematical creativity. In this game all elements in a set of numbers have to be used precisely once to create a target number with basic arithmetic operations. We argue that some instances of this game are NP complete, by showing its relation to the well-known Partition problem. We propose heuristics based on the distinction in forward and backward reasoning. The Number (...) Game is part of Math Garden, a popular online educational platform for practicing and monitoring math skills using innovations in computerized adaptive testing. These educational games generate enormous amounts of rich data on children's cognitive development. We found converging evidence for the use of forward proximity heuristics in the data of Math Garden, consisting of more than 20 million answers to 1,700 items. Item difficulties and the structure of correct answers were analyzed. (shrink)

In this paper, we introduce the methodology and techniques of meta-argumentation to model argumentation. The methodology of meta-argumentation instantiates Dung’s abstract argumentation theory with an extended argumentation theory, and is thus based on a combination of the methodology of instantiating abstract arguments, and the methodology of extending Dung’s basic argumentation frameworks with other relations among abstract arguments. The technique of meta-argumentation applies Dung’s theory of abstract argumentation to itself, by instantiating Dung’s abstract arguments with meta-arguments using a technique called flattening. (...) We characterize the domain of instantiation using a representation technique based on soundness and completeness. Finally, we distinguish among various instantiations using the technique of specification languages. (shrink)

Background: Debates over legalisation of physician-assisted suicide or euthanasia often warn of a “slippery slope”, predicting abuse of people in vulnerable groups. To assess this concern, the authors examined data from Oregon and the Netherlands, the two principal jurisdictions in which physician-assisted dying is legal and data have been collected over a substantial period.Methods: The data from Oregon comprised all annual and cumulative Department of Human Services reports 1998–2006 and three independent studies; the data from the Netherlands comprised all four (...) government-commissioned nationwide studies of end-of-life decision making and specialised studies. Evidence of any disproportionate impact on 10 groups of potentially vulnerable patients was sought.Results: Rates of assisted dying in Oregon and in the Netherlands showed no evidence of heightened risk for the elderly, women, the uninsured , people with low educational status, the poor, the physically disabled or chronically ill, minors, people with psychiatric illnesses including depression, or racial or ethnic minorities, compared with background populations. The only group with a heightened risk was people with AIDS. While extralegal cases were not the focus of this study, none have been uncovered in Oregon; among extralegal cases in the Netherlands, there was no evidence of higher rates in vulnerable groups.Conclusions: Where assisted dying is already legal, there is no current evidence for the claim that legalised PAS or euthanasia will have disproportionate impact on patients in vulnerable groups. Those who received physician-assisted dying in the jurisdictions studied appeared to enjoy comparative social, economic, educational, professional and other privileges. (shrink)

The subtitle of this paper could have been, “Big Data meets Education to advance Cognitive Science.” In it, the authors analyze 20 million answers to 1700 simple arithmetic problems in an educational number game to determine “what makes some problems harder than others.” The results contribute to the cognitive science of arithmetic skill acquisition and have the potential to change how math is taught.

The paper is concerned with the psychological relevance of a logical model for deductive reasoning. We propose a new way to analyze logical reasoning in a deductive version of the Mastermind game implemented within a popular Dutch online educational learning system (Math Garden). Our main goal is to derive predictions about the difficulty of Deductive Mastermind tasks. By means of a logical analysis we derive the number of steps needed for solving these tasks (a proxy for working memory load). Our (...) model is based on the analytic tableaux method, known from proof theory. We associate the difficulty of Deductive Mastermind game-items with the size of the corresponding logical trees obtained by the tableaux method. We derive empirical hypotheses from this model. A large group of students (over 37 thousand children, 5–12 years of age) played the Deductive Mastermind game, which gave empirical difficulty ratings of all 321 game-items. The results show that our logical approach predicts these item ratings well, which supports the psychological relevance of our model. (shrink)

Results of two survey studies are presented. It is shown that attitudes of the public about "technology in general" are not stable and can easily be affected by how the subject is introduced. Eight areas of technology are compared on the basis of empirical relations in attitudinal judgments, in attribute ratings, in self- assigned importance weights of attributes, and in importance of reference groups and persons. On the basis of similarities in these four kinds of judgments, three clusters of technology (...) areas were identified: a cluster of modern reproductive technologies, an information cluster containing automation, computer, and communication technologies, and a cluster containing nuclear energy and military technology. The attitude toward "technology in general" can not be considered as an aggregation of attitudes toward these areas of technology: The relations between general attitude and specific attitudes are only moderate to negligible. (shrink)

Some observers regard South Africa as one of the most violent, lawless and morally depraved societies in the world. Several other countries around the world can be shown to be similarly afflicted. In South Africa's case, this condition might be because of political transformation, particularly the lingering effects of the struggle against past injustices inflicted on sections of the population. The social instability has been exacerbated by an influx of migrants and a resultant increase in diversity. One way of attempting (...) to assuage this situation is to harness the school subject known as 'citizenship education' for guiding the upcoming generations into committing to a new moral compass, that is, awareness or consciousness with a conscience, and to an accompanying new social contract. Finding a rationale for such a moral compass and social contract that all the citizens of South Africa and of other similarly stricken countries would be prepared to commit to is a daunting task because people tend to be subjective in reflecting about their personal and group views, particularly about their religious beliefs and convictions. Closer examination reveals, however, that despite all the diversity, differences and conflict prevalent in societies, people are potentially able to share a set of basic values that arguably could form the core of the sought-for moral compass. Citizenship education could be functional in bringing home to the next generation the notion of henceforth living in accordance with the precepts of such a moral compass and social contract. (shrink)

Umuntu ngumuntu ngabantu is the Zulu version of a traditional African aphorism . Although with considerable loss of culture-specific meaning, it can be translated as: “A human being is a human being through other human beings.” Still, its meaning can be interpreted in various ways of which I would like to highlight only two, in accordance with the grammar of the central concept ‘Ubuntu’ which denotes both a state of being and one of becoming.Firstly, it can be interpreted as a (...) statement of fact about the human condition, i.e. as a descriptive claim about the social nature of human being and personal identity; even the constitutive relation between alterity and identity. Secondly, it can also be interpreted as a value-judgement, i.e. as a normative appreciation of social difference and human diversity; even as an imperative to expose ourselves to others, to encounter the difference of their humanness, in order to fully become our own. The meaning would then be — to paraphrase a translation of Ramose : To be human is to affirm one’s humanity by recognising the humanity of others in its infinite variety of content and form.CONCLUSION :The challenge of a philosophical understanding of the multi-cultural context of apartheid South Africa has still to be met. To meet this challenge is to try and trace the consequences of what it would mean if — to paraphrase Walzer — our crucial commonality is our particularity. Perhaps it will mean accepting that what we are and are becoming, our identity, escapes any reduction to the categories of the ‘self’ and the ‘other’ and eludes a dialectical ‘aufhebung’ of their difference. This may be the case if what we are and are becoming involves the paradox of being and becoming ever more different in the realisation of our self-sameness. Our African aphorism speaks of this paradox and, in so doing, it draws a limit to our philosophical understanding and provides us with a rule of conduct: Umuntu ngumuntu ngabantu! (shrink)