Hempel's paradox of the ravens has to do with the question of what constitutes confirmation from a logical point of view; Wason 's selection task has been used extensively to investigate how people go about attempting to confirm or disconfirm conditional claims. This paper presents an argument that the paradox is resolved, and that people's typical performance in the selection task can be explained, by consideration of what constitutes an effective strategy for seeking evidence of the tenability of universal or (...) conditional claims in everyday life. (shrink)

This book reviews the work of prominent psychologists and philosophers on conditional reasoning. It provides empirical research on how people deal with conditional arguments and examines how conditional statements are used and interpreted in everyday communication.

ABSTRACTTreating conditionals as probabilistic statements has been referred to as a defining feature of the “new paradigm” in cognitive psychology. Doing so is attractive for several reasons, but it complicates the problem of assessing the merits of conditional arguments. We consider several variables that relate to judging the persuasiveness of conditional arguments with uncertain premises. We also explore ways of judging the consistency of people's beliefs as represented by components of conditional arguments. Experimental results provide evidence that inconsistencies in beliefs (...) are more prevalent if the arguments’ components are spatially and temporally dispersed than if they are contiguous in space and time. This supports the idea that assuring the consistency among even a small number of beliefs is difficult to do, especially if the beliefs in question are not brought into consciousness at the same time; but consistency can be enhanced when beliefs are considered simultaneously or nea... (shrink)

The term “exchange paradox” refers to a situation in which it appears to be advantageous for each of two holders of an envelope containing some amount of money to always exchange his or her envelope for that of the other individual, which they know contains either half or twice their own amount. We review several versions of the problem and show that resolving the paradox depends on the specifics of the situation, which must be disambiguated, and on the player's beliefs. (...) The latter psychological variables are part and parcel of the resolution. Assuming reasonable subjective distributions, exchanging cannot always be advantageous for both players. We suggest several deep-rooted psychological reasons for the considerable difficulty people demonstrably have in dealing with this problem. Implicit widespread and compelling assumptions—that affect judgement in diverse contexts—obstruct the solution. Analysing this paradox underscores the close connection between psychology and probability theory. (shrink)

The “exchange paradox”—also referred to in the literature by a variety of other names, notably the “two-envelopes problem”—is notoriously difficult, and experts are not all agreed as to its resolution. Some of the various expressions of the problem are open to more than one interpretation; some are stated in such a way that assumptions are required in order to fill in missing information that is essential to any resolution. In three experiments several versions of the problem were used, in each (...) of which the information given was sufficient to determine an optimal choice strategy when it exists or to justify indifference regarding keeping or trading when such a strategy does not exist. College students who were presented with the various versions of the problem tended to base their choices on simple heuristics and to give little evidence of understanding the probabilistic implications of the differences in the problem statements. (shrink)

Drawing from the study of human reasoning, Argumentation describes different types of arguments and explains how they influence beliefs and behaviour. Raymond Nickerson identifies many of the fallacies, biases, and other flaws often found in arguments as well as 'stratagems' that people regularly use to persuade others. Much attention is given to the evaluation of arguments. Readers will learn a new schematic for evaluating arguments based on cognitive science. As a source for understanding and evaluating arguments in decision-making, (...) it is ideal for courses on cognition, reasoning, and psychology. (shrink)

The "two-envelopes" problem has stimulated much discussion on probabilistic reasoning, but relatively little experimentation. The problem specifies two identical envelopes, one of which contains twice as much money as the other. You are given one of the envelopes and the option of keeping it or trading for the other envelope. Variables of interest include the possible amounts of money involved, what is known about the process by which the amounts of money were assigned to the envelopes, and whether you are (...) allowed to know how much money is in the envelope in hand before deciding whether to keep or trade. In an earlier study, Butler and Nickerson found that when participants were allowed to know how much was in the envelope in hand, they generally elected to trade if that amount was small relative to the range of possibilities and to keep otherwise. The present experiments showed that this propensity was independent of the amount of money in the envelopes. Participants made decisions with a strong bias for avoiding the risk of losing by trading, particularly when the amount in hand was known and large relative to the range of possible amounts, regardless of the absolute value of the gamble. The results illustrate the dependence of thinking on the context in which it occurs, and demonstrate a tendency to treat quantities that are large or small relative to a particular context in which they are encountered as though they were large or small in a more general sense. (shrink)

Two old problems in probability theory involving the concept of randomness are considered. Data obtained with one of them--Bertrand's chord problem--demonstrate the equivocality of this term in the absence of a definition or explication of assumptions underlying its use. They also support two propositions about probabilistic thinking: (1) upon obtaining an answer to a question of probability, people tend to see it as the answer, overlooking tacit assumptions on which it may be based, and tend not to consider the possibility (...) of other assumptions from which different answers would follow; (2) perceptual balance--moderate uniformity of density of distribution--is a determinant of the degree to which a two-dimensional pattern is perceived as random. (shrink)

Two experiments were conducted with variants of Wason's (1966) selection task. The common focus was the effect of differences in the sizes of the sets represented by P and not-Q in assertions of the form _If P then Q_ (conditional) or _All P are Q_ (categorical). Results support the conclusion that such set size differences affect the strategies people adopt when asked to determine, efficiently, the truth or falsity of such assertions, but they do not entirely negate the tendency to (...) select the term represented by P (the antecedent of the conditional or the subject of the categorical) in preference to the term represented by not-Q (the complement of the consequent of the conditional or the complement of the predicate of the categorical). Several possible explanations of this perseverance are considered. Results also support the conclusion that people find it easier to assess categorical assertions than logically equivalent conditional assertions. (shrink)

Elqayam & Evans (E&E) argue that the major objective of research on human thinking should be the development of descriptive theories, and they challenge normativism the belief that people ought to conform to a normative standard” (target article, sect. 1, para. 10). I contend that although their argument for the importance of developing descriptive theories is compelling, normative theories are also important, not only for improving thinking but for investigating and understanding it as well.

Introduction This book is about reasoning. It is not a textbook in the conventional sense. Nor does it provide a prescription for how to reason effectively. ...

Participants attempted to solve a modified version of Wason's selection task. Variables were: sizes of the sets referenced by a specified assertion, form of the assertion, thematic content of the assertion, and the need for sampling or not. In Experiment 1, participants were given enough information to determine the truth or falsity of the specified assertion with certainty; in Experiment 2, they had to rely on sampling and could not determine the assertion's truth or falsity with certainty. Performance was better (...) in Experiment 1 than in Experiment 2, but in both cases much better than what is typically obtained with the conventional selection task. The results support the hypothesis that performance of the selection task is sensitive to the sizes of the sets involved, add credence to the conclusion that framing the task in a thematically meaningful way can facilitate performance, and demonstrate that facilitation does not require deontic reasoning or a well-known convention being involved. The relationship between expressed confidence and level of performance is consistent with other studies showing the former to be a good predictor of the latter. (shrink)

This book explores how people's subjective, felt experiences of their bodies in action provide part of the fundamental grounding for human cognition and language. Cognition is what occurs when the body engages the physical and cultural world and must be studied in terms of the dynamical interactions between people and the environment. Human language and thought emerge from recurring patterns of embodied activity that constrain ongoing intelligent behavior. We must not assume cognition to be purely internal, symbolic, computational, and disembodied, (...) but seek out the gross and detailed ways that language and thought are inextricably shaped by embodied action. Embodiment and Cognitive Science describes the abundance of empirical evidence from many disciplines, including work on perception, concepts, imagery and reasoning, language and communication, cognitive development, and emotions and consciousness, that support the idea that the mind is embodied. (shrink)

Its first paradigms are in the writings of Marx and Freud. In this book Raymond Geuss sets out these fundamental claims and asks whether they can be made good.

This completely self-contained study, widely considered the best book in the field, is intended to serve both as an introduction to quantification theory and as ...

When Russell was fifteen, he was given a copy of W. K. Clifford’s _The Common Sense of the Exact Sciences_ (1886). Russell later recalled reading it immediately “with passionate interest and with an intoxicating delight in intellectual clarification”. Why then, when Russell wrote _An Essay on the Foundations of Geometry_ (1897), did he choose to defend spaces of homogeneous curvature as a priori? Why was he almost completely silent thereafter on the subject of Clifford, and his writings on geometry and (...) space? We suggest that Russell may have avoided Clifford’s hypothesis that space had heterogeneous curvature because it seemed impossible to reconcile a coherent theory of measurement with a space of variable curvature. Whitehead objected to Einstein’s general theory of relativity on this basis, formulating an alternate theory that preserved the constant curvature of space and, therefore, a familiar sense of measurement. After Einstein’s general theory, Russell chose to distance himself from the position he argued in the _Essay_. (shrink)

Written by a creative master of mathematical logic, this introductory text combines stories of great philosophers, quotations, and riddles with the fundamentals of mathematical logic. Author Raymond Smullyan offers clear, incremental presentations of difficult logic concepts. He highlights each subject with inventive explanations and unique problems. Smullyan's accessible narrative provides memorable examples of concepts related to proofs, propositional logic and first-order logic, incompleteness theorems, and incompleteness proofs. Additional topics include undecidability, combinatoric logic, and recursion theory. Suitable for undergraduate and (...) graduate courses, this book will also amuse and enlighten mathematically minded readers. (shrink)

This book traces the development of theories of the self and personal identity from the ancient Greeks to the present day. From Plato and Aristotle to Freud and Foucault, Raymond Martin and John Barresi explore the works of a wide range of thinkers and reveal the larger intellectual trends, controversies, and ideas that have revolutionized the way we think about ourselves. The authors open with ancient Greece, where the ideas of Plato, Aristotle, and the materialistic atomists laid the groundwork (...) for future theories. They then discuss the ideas of the church fathers and medieval and Renaissance philosophers, including St. Paul, Philo, Augustine, Aquinas, and Montaigne. In their coverage of the emergence of a new mechanistic conception of nature in the seventeenth century, Martin and Barresi note a shift away from religious and purely philosophical notions of self and personal identity to more scientific and social conceptions, a trend that has continued to the present day. They explore modern philosophy and psychology, including the origins of different traditions within each discipline, and explain both the theoretical relevance of feminism and gender and ethnic studies and also the ways that Derrida and other recent thinkers have challenged the very idea that a unified self or personal identity even exists. Martin and Barresi cover a number of issues broached by philosophers and psychologists, such as the existence of a fixed and unchanging self and whether the concept of the soul has a use outside of religious contexts. They address the question of whether notions of the soul and the self are still viable in today's world. Together, they reveal the fascinating ways in which great thinkers have grappled with these and other questions and the astounding impact their ideas have had on the development of self-understanding in the west. (shrink)

Acknowledged as perhaps _the_ masterpiece of materialist criticism in the English language, this omnibus ranges over British literary history from George Eliot to George Orwell to inquire about the complex ways economic reality shapes the imagination.

In a devastating critique Raymond Tallis exposes the exaggerated claims made for the ability of neuroscience and evolutionary theory to explain human consciousness, behaviour, culture and society. While readily acknowledging the astounding progress neuroscience has made in helping us understand how the brain works, Tallis directs his guns at neuroscience’s dark companion – "Neuromania" as he describes it – the belief that brain activity is not merely a necessary but a sufficient condition for human consciousness and that consequently our (...) everyday behaviour can be entirely understood in neural terms. With the formidable acuity and precision of both clinician and philosopher, Tallis dismantles the idea that "we are our brains", which has given rise to a plethora of neuro-prefixed pseudo-disciplines laying claim to explain everything from art and literature to criminality and religious belief, and shows it to be confused and fallacious, and an abuse of the prestige of science, one that sidesteps a whole range of mind–body problems. The belief that human beings can be understood essentially in biological terms is a serious obstacle, argues Tallis, to clear thinking about what human beings are and what they might become. To explain everyday behaviour in Darwinian terms and to identify human consciousness with the activity of the evolved brain denies human uniqueness, and by minimising the differences between us and our nearest animal kin, misrepresents what we are, offering a grotesquely simplified and degrading account of humanity. We are, shows Tallis, infinitely more interesting and complex than we appear in the mirror of biologism. Combative, fearless and always thought-provoking, _Aping Mankind _is an important book, one that scientists, cultural commentators and policy-makers cannot ignore. (shrink)

What are the origins of human difference? The Hand, which is the first part of a bold philosophical inquiry into the nature of the difference between human beings and other animals, argues that it is the result of a complex sequence of events which began several million years ago with the evolution of the human hand.Possession of a fully developed hand profoundly transformed the relationship of the human being to its own body, thus altering the relationship between humans and the (...) natural world. The interaction of the hand with the rest of the body brought about self-consciousness and laid the foundations for the unique sense of agency that is experienced by humans. Crucially, the hand inspired the tool-use that has come to dominate human life and which has led to the emergence of the complex symbolic systems - most importantly language - that underpin civilisation.The book also celebrates the hand in human life: the almost miraculous complexity of its manipulative, exploratory and communicative functions. Raymond Tallis combines philosophical reflection with a light-hearted look at gestures, the role of each finger, the origins of numbers - and the case for and against what he names 'handkind'.The Hand is the first of three volumes. The other titles are I Am: A Philosophical Inquiry into First-Person Being and The Knowing Animal: A Philosophical Inquiry into Truth and Knowledge. (shrink)

Raymond Geuss has been a distinctive contributor to the analysis and evaluation of German philosophy and to recent debates in ethics. In this new collection he treats a variety of topics in ethics, aesthetics, and the philosophy of history with special reference to the work of Hegel, Nietzsche, and Adorno. Two of the essays in the volume deal with central aspects of the philosophy of Nietzsche. The collection also contains an essay on the history of conceptions of 'culture' and (...) one on the ethics of Ernst Tugendhat. The remaining three essays focus on questions in aesthetics. The volume will be of interest to students of modern philosophy, German intellectual and cultural history, and literary theory. (shrink)

First published in 1980. Routledge is an imprint of Taylor & Francis, an informa company.

Neuroscience has made astounding progress in the understanding of the brain. What should we make of its claims to go beyond the brain and explain consciousness, behaviour and culture? Where should we draw the line? In this brilliant critique Raymond Tallis dismantles "Neuromania", arising out of the idea that we are reducible to our brains and "Darwinitis" according to which, since the brain is an evolved organ, we are entirely explicable within an evolutionary framework. With precision and acuity he (...) argues that the belief that human beings can be understood in biological terms is a serious obstacle to clear thinking about what we are and what we might become. Neuromania and Darwinitis deny human uniqueness, minimise the differences between us and our nearest animal kin and offer a grotesquely simplified account of humanity. We are, argues Tallis, infinitely more interesting and complex than we appear in the mirror of biology. Combative, fearless and thought-provoking, _Aping Mankind_ is an important book and one that scientists, cultural commentators and policy-makers cannot ignore. This Routledge Classics edition includes a new preface by the Author. (shrink)

Collects a variety of mathematics and logic puzzles, some based on the theorems of the mathematician Kurt Godel.

This book is vigorous in its arguments, displays an impressive historical sweep, and on several occasions gets in the perfect skewering criticism.

What is law? Does it have a purpose? What is its relationship with justice? Do we have a moral duty to obey the law? These sorts of questions lie at the heart of jurisprudence. Moreover, every substantive or 'black letter' branch of the law raises questions about its own meaning and function. The law of contract cannot be properly understood without an appreciation of the concepts of rights and duties. The law of tort is directly related to several economic theories (...) of compensation. The criminal law is inextricably linked to philosophies of punishment? Understanding Jurisprudence explores these problems and provides an engaging introduction to the central issues of legal theory. The book navigates the reader through legal philosophy's fundamental concepts, concerns, and controversies. An experienced teacher of jurisprudence and distinguished writer in the field, Professor Wacks adopts an approach that is easy to follow and understand without avoiding the complexities and subtleties of the subject. Students of law, politics, philosophy, and other social sciences will find this an ideal guide to the essential themes of contemporary jurisprudence. Online Resource Centre A free online resource accompanies the book and provides the following resources: Analysis of current controversies of a jurisprudential nature such as current legal and moral controversies and political debates An additional chapter providing guidance and advice on the study of jurisprudence An interactive glossary of key terms relating to legal theory Further reading, including links to full text journal articles Questions and answers Useful Web links to support learning. (shrink)

Raymond Wacks is Emeritus Professor of Law and Legal Theory at the University of Hong Kong.

This book presents a systematic, unified treatment of fixed points as they occur in Godels incompleteness proofs, recursion theory, combinatory logic, semantics, and metamathematics. Packed with instructive problems and solutions, the book offers an excellent introduction to the subject and highlights recent research.

Philosophy is one of the most intimidating and difficult of disciplines, as any of its students can attest. This book is an important entry in a distinctive new series from Routledge: "The Great Philosophers." Breaking down obstacles to understanding the ideas of history's greatest thinkers, these brief, accessible, and affordable volumes offer essential introductions to the great philosophers of the Western tradition from Plato to Wittgenstein.In just 64 pages, each author, a specialist on his subject, places the philosopher and his (...) ideas into historical perspective. Each volume explains, in simple terms, the basic concepts, enriching the narrative through the effective use of biographical detail. And instead of attempting to explain the philosopher's entire intellectual history, which can be daunting, this series takes one central theme in each philosopher's work, using it to unfold the philosopher's thoughts. (shrink)

Treating mathematical science as a distinct cultural entity subject to environmental factors which influence its evolution, the author examines the creation and development of its major concepts since early times.

A stimulating introduction to central issues of political theory, including liberty, rights and the state, and the claims of need and politics.

Facing up to the head -- The secreting head -- Being my head -- The head comes to -- Airhead : breathing and its variations -- Communicating with air -- Enjoying and suffering my head -- Communicating without air -- Notes on the red-cheeked animal : the geology of a blush -- The watchtower -- The sensory room -- Having and using my head -- Head traffic : eating, vomiting and smoking -- Head on head : notes on kissing -- (...) Headgear -- Caretaking my head -- In the wars -- The dwindles -- Knowing (and not knowing) my head -- Head and world -- The thinking head -- Epilogue: Heading off. (shrink)

Raymond Klibansky est né à Paris en 1905, dans une famille d'origine juive allemande. De l'Allemagne cultivée de l'entre-deux-guerres et des sociétés d'étudiants, via la montée du nazisme et le sauvetage de la bibliothèque Warburg, jusqu'à son rôle d'espion pour les Britanniques, ce philosophe a côtoyé les plus grands esprits de ce siècle.