Classifying ℵo-Categorical Theories II: The Existence of Finitely Axiomatizable Proper Class II Theories

Clark and Krauss [1977] presents a classification of complete, satisfiable and _o-categorical theories in first order languages with finite non-logical vocabularies. In 1988 the first author modified this classification and raised three questions about the distribution of finitely axiomatizable theories. This paper answers two of those questions.     

Probability and conspiratorial thinking

Conspiracy theories as alternative explanations for events and states of affairs enjoy widespread popularity. We test one possible explanation for why people are prone to conspiratorial thinking: We hypothesize that conspiratorial thinking as an explanation for events increases as the probability of those events decreases. In order to test this hypothesis, we have conducted five experiments in which participants were exposed to different information about probabilities of fictional events. The results of all experiments support the hypothesis: The lower the probability of an event, the stronger participants embrace conspiratorial explanations. Conspiratorial thinking, we conclude, potentially represents a cognitive heuristic: A coping mechanism for uncertainty.     

Addiction as a functional representation

This study examined how perceptions of the addicted state vary as a function of social conditions, personal circumstances and type of substance. University students (n = 144) were presented with portrayals of drug users in which sex, drug type and social setting were varied. A questionnaire determined the degree to which participants thought that the person portrayed was (i) addicted, (ii) prone to use drugs due to his/her personality, and (iii) perceived as a problem to society. The pattern of results fitted a functional model of the addiction concept rather than an attempt to describe an ‘objective’ state. Copyright © 2001 John Wiley & Sons, Ltd.     

Plato's Theory of Aging

Plato's writings express a positive attitude toward elderly people. But do his writings also show a serious theoretical interest in issues of aging? We approach this question by comparing what Plato says about aging to major theoretical issues in gerontology. We argue that many of Plato's subtler observations of the behavior of elderly people and many of his ideas about aging anticipate specific research and theoretical advances in contemporary gerontology. We compare passages in Plato's works to the debate between activity and disengagement theories, the concepts of continuity and gerotranscendence, Robert Butler's discovery of “the life review,” and recent theories of old age wisdom. Plato's anticipation of these ideas and issues related to them suggests that his writings may contain still other major insights into aging which are not yet articulated in gerontology. We suggest three possibilities.     

Solidarity in Perinatal Medicine

In this paper it is argued that questions in perinatal medicine concerning treatment or non-treatment of severely handicapped children, after or before birth, cannot be answered solely by referring to the general aims and objectives of medical treatment and its specific deontology. Justifications of decisions about treatment and non-treatment need to be placed in a broader context of discussions about social justice and the social significance of medical practice as a whole.     

Quantum structure in cognition

The broader scope of our investigations is the search for the way in which concepts and their combinations carry and influence meaning and what this implies for human thought. More specifically, we examine the use of the mathematical formalism of quantum mechanics as a modeling instrument and propose a general mathematical modeling scheme for the combinations of concepts. We point out that quantum mechanical principles, such as superposition and interference, are at the origin of specific effects in cognition related to concept combinations, such as the guppy effect and the overextension and underextension of membership weights of items. We work out a concrete quantum mechanical model for a large set of experimental data of membership weights with overextension and underextension of items with respect to the conjunction and disjunction of pairs of concepts, and show that no classical model is possible for these data. We put forward an explanation by linking the presence of quantum aspects that model concept combinations to the basic process of concept formation. We investigate the implications of our quantum modeling scheme for the structure of human thought, and show the presence of a two-layer structure consisting of a classical logical layer and a quantum conceptual layer. We consider connections between our findings and phenomena such as the disjunction effect and the conjunction fallacy in decision theory, violations of the sure thing principle, and the Allais and Elsberg paradoxes in economics.     

THE “SCIENTIFIC MIRACLE OF THE QUR’ĀN,” PSEUDOSCIENCE,AND CONSPIRACISM

This article, after tracing a precise classification of the exegetical trend known as i?jāz ?ilmī, summarizes and discusses the criticism leveled at it and examines how the “scientific interpretation” of the Qur’ān is liable to blend with pseudoscience and conspiracy theories to the detriment of a solid harmonization of science and religion and of a genuine appreciation of natural science. Furthermore, the article offers some practical ideas that can be implemented in order to effectively and fairly address i?jāz ?ilmī in the Muslim world.     

The Role of Lexical Frequency in the Acceptability of Syntactic Variants: Evidence From that‐Clauses in Polish

A number of studies report that frequency is a poor predictor of acceptability, in particular at the lower end of the frequency spectrum. Because acceptability judgments provide a substantial part of the empirical foundation of dominant linguistic traditions, understanding how acceptability relates to frequency, one of the most robust predictors of human performance, is crucial. The relation between low frequency and acceptability is investigated using corpus‐ and behavioral data on the distribution of infinitival and finite that‐complements in Polish. Polish verbs exhibit substantial subordination variation and for the majority of verbs taking an infinitival complement, the that‐complement occurs with low frequency (<0.66 ipm). These low‐frequency that‐clauses, in turn, exhibit large differences in how acceptable they are to native speakers. It is argued that acceptability judgments are based on configurations of internally structured exemplars, the acceptability of which cannot reliably be assessed until sufficient evidence about the core component has accumulated.     

Understanding intergroup relations through the lens of implicit theories (mindsets) of malleability

This review argues that implicit theories of malleability are essential constructs for the study of intergroup dynamics. As one of people's core meaning‐making tools, mindsets about malleability shed light on the mechanisms behind perceivers' tendency to stereotype and feel prejudiced towards targets, as well as on the mechanisms underlying targets' ability to shield against, and potentially confront, bias. In addition to illuminating cross‐group interaction dynamics between individuals, mindsets contribute to explaining the harmful processes at play in real‐world protracted conflicts and suggest interventions that may help lay the ground for peace processes. This review also aims to highlight areas of research that remain open for further investigation or that have been overlooked to date. We argue that research integrating mindsets and intergroup relations will advance our understanding of intergroup dynamics, as well as possibly offering insights on how to improve them, and that this approach will also further the study of lay theories of malleability.