The tendency to test outcomes that are predicted by our current theory (the confirmation bias) is one of the best-known biases of human decision making. We prove that the confirmation bias is an optimal strategy for testing hypotheses when those hypotheses are deterministic, each making a single prediction about the next event in a sequence. Our proof applies for two normative standards commonly used for evaluating hypothesis testing: maximizing expected information gain and maximizing the probability of falsifying the current hypothesis. (...) This analysis rests on two assumptions: (a) that people predict the next event in a sequence in a way that is consistent with Bayesian inference; and (b) when testing hypotheses, people test the hypothesis to which they assign highest posterior probability. We present four behavioral experiments that support these assumptions, showing that a simple Bayesian model can capture people's predictions about numerical sequences (Experiments 1 and 2), and that we can alter the hypotheses that people choose to test by manipulating the prior probability of those hypotheses (Experiments 3 and 4). (shrink)

Generalization is a fundamental problem solved by every cognitive system in essentially every domain. Although it is known that how people generalize varies in complex ways depending on the context or domain, it is an open question how people learn the appropriate way to generalize for a new context. To understand this capability, we cast the problem of learning how to generalize as a problem of learning the appropriate hypothesis space for generalization. We propose a normative mathematical framework for learning (...) how to generalize by learning inductive biases for which properties are relevant for generalization in a domain from the statistical structure of features and concepts observed in that domain. More formally, the framework predicts that an ideal learner should learn to generalize by either taking the weighted average of the results of generalizing according to each hypothesis space, with weights given by how well each hypothesis space fits the previously observed concepts, or by using the most likely hypothesis space. We compare the predictions of this framework to human generalization behavior with three experiments in one perceptual (rectangles) and two conceptual (animals and numbers) domains. Across all three studies we find support for the framework's predictions, including individual‐level support for averaging in the third study. (shrink)

To attribute confusion to someone is to take up a paternalistic stance in evaluating his reasoning.

Everyone has mistaken one thing for another, such as a stranger for an acquaintance. A person who has mistaken two things, Joseph Camp argues, even on a massive scale, is still capable of logical thought. In order to make that idea precise, one needs a logic of confused thought that is blind to the distinction between the objects that have been confused. Confused thought and language cannot be characterized as true or false even though reasoning conducted in such language (...) can be classified as valid or invalid. To the extent that philosophers have addressed this issue at all, they take it for granted that confusion is a kind of ambiguity. Camp rejects this notion; his fundamental claim is that confusion is not a mental state. To attribute confusion to someone is to take up a paternalistic stance in evaluating his reasoning. Camp proposes a novel characterization of confusion, and then demonstrates its fruitfulness with several applications in the history of philosophy and the history of science. (shrink)

The Internet furore over Intel’s flawed Pentium chip provides an important case study of the ethical ambiguity of internet communications and the legitimacy of certain forms of “electronic activism”. Joseph Badaracco, Jr., is John Shad Professor of Business Ethics at the Harvard Business School and his co‐author is a former Research Associate at Harvard and currently on the editorial staff of Inc. magazine.

How does the visual system recognize images of a novel object after a single observation despite possible variations in the viewpoint of that object relative to the observer? One possibility is comparing the image with a prototype for invariance over a relevant transformation set. However, invariance over rotations has proven difficult to analyze, because it applies to some objects but not others. We propose that the invariant transformations of an object are learned by incorporating prior expectations with real-world evidence. We (...) test this proposal by developing an ideal learner model for learning invariance that predicts better learning of orientation dependence when prior expectations about orientation are weak. This prediction was supported in two behavioral experiments, where participants learned the orientation dependence of novel images using feedback from solving arithmetic problems. (shrink)

This book presents a new, powerful, and practical way of making final decisions on the hard, complex, uncertain problems of life and work. What if you have looked at the data, talked with trusted colleagues, and applied all the relevant managerial and ethical frameworks, but you still don't know what is right. How should you make your final decision? This crucial question is rarely asked or answered. And some standard answers – follow your moral compass, your conscience, or your values (...) – offer more inspiration than practical guidance. This book argues that, when we make final, hard decisions, we learn what is right by defining – personally – what is right. We find moral clarity by creating it. The book presents a fresh, challenging, and practical perspective on our hardest decisions. It offers a new conceptual approach for teachers and scholars and practical guidance for leaders and managers. (shrink)

At first glance, legislation intended to shape American adult Iiteracy programs appears egalitarian and hopeful. After a more thorough reading, the legislative objectives are Iimited, culturally biased, and largely unattainable. In order to develop coherent Iiteracy pedagogy, we explore Paulo Freire’s definition of critical thinking. From a critical theory perspective, we argue that a vocational education of learning basic skills is insufficient. Furthermore, we believe that more is needed to help adult learners beconle self-sufficient in a modern, dynamic economy. Critical (...) thinking, as defined by Freire, along with vocational education allows individuaIs to develop their ontological right to become aware of historical and social forces. (shrink)

The debate between the theory-theory and simulation has largely ignored issues of cognitive architecture. In the philosophy of psychology, cognition as symbol manipulation is the orthodoxy. The challenge from connectionism, however, has attracted vigorous and renewed interest. In this paper I adopt connectionism as the antecedent of a conditional: If connectionism is the correct account of cognitive architecture, then the simulation theory should be preferred over the theory-theory. I use both developmental evidence and constraints on explanation in psychology to support (...) this claim. (shrink)

There is growing interest in developing co-operation between adult literacy researchers and practitioners to further research skills and approaches. Canada’s National Literacy Secretariat has recently initiated a series of policy debates that suggested several possibilities: targeted research grants, research internships for practitioners, practical sabbaticals for researchers, support for networking between literacy researchers and practitioners, and joint seminars and workshops between researchers and practitioners. A common theme throughout these discussions is the need to develop critical thinking about both collaborative research and (...) adult literacy. In this paper we discuss two collaborative initiatives between university-based researchers and adult literacy groups in the provinces of British Columbia and Ontario. Each project was based on the notion of “research circles” and specifically designed to enhance research capacity and critical thinking about literacy research. (shrink)

The debate between the theory‐theory and simulation has largely ignored issues of cognitive architecture. In the philosophy of psychology, cognition as symbol manipulation is the orthodoxy. The challenge from connectionism, however, has attracted vigorous and renewed interest. In this paper I adopt connectionism as the antecedent of a conditional: If connectionism is the correct account of cognitive archi‐tecture, then the simulation theory should be preferred over the theory‐theory. I use both developmental evidence and constraints on explanation in psychology to support (...) this claim. (shrink)

What has been has been; what is is; what will be will be. Where in this solidity is there room for the alternative paths seemingly demanded by "can"s and "could"s? What is the relation of that which can be, could be, or could have been to that which is, was or will be? The suggestions that "can" is ambiguous and that it is implicitly conditional are rejected. It is argued instead that "can't" is the affirmative, asserting the existence of one (...) or more "preventers" of the event in question. "Can," its contradictory, is then actually the negative, denying the existence of a limited set of preventers generally specified more or less clearly and delimited more or less sharply by the context in question. This eliminates one, illegitimate, class of deterministic worries over responsibility, praise and blame, but merely intensifies those of another, genuine, kind. (shrink)

Mealey's (1995a) psychological explanation of the sociopath's antisocial activity appeals to an incomplete or nonstandard theory of mind. This is not the only possible mechanism of mental state attribution. The simulation theory of mental state ascription offers a better hope of explaining the diverse elements of sociopathy reported by Mealey.

In 1968, the Harvard criteria equated irreversible coma and apnea with human death and later, the Uniform Determination of Death Act was enacted permitting organ procurement from heart-beating donors. Since then, clinical studies have defined a spectrum of states of impaired consciousness in human beings: coma, akinetic mutism, minimally conscious state, vegetative state and brain death. In this article, we argue against the validity of the Harvard criteria for equating brain death with human death. Brain death does not disrupt somatic (...) integrative unity and coordinated biological functioning of a living organism. Neurological criteria of human death fail to determine the precise moment of an organism’s death when death is established by circulatory criterion in other states of impaired consciousness for organ procurement with non-heart-beating donation protocols. The criterion of circulatory arrest 75 s to 5 min is too short for irreversible cessation of whole brain functions and respiration controlled by the brain stem. Brain -based criteria for determining death with a beating heart exclude relevant anthropologic, psychosocial, cultural, and religious aspects of death and dying in society. Clinical guidelines for determining brain death are not consistently validated by the presence of irreversible brain stem ischemic injury or necrosis on autopsy; therefore, they do not completely exclude reversible loss of integrated neurological functions in donors. The questionable reliability and varying compliance with these guidelines among institutions amplify the risk of determining reversible states of impaired consciousness as irreversible brain death. The scientific uncertainty of defining and determining states of impaired consciousness including brain death have been neither disclosed to the general public nor broadly debated by the medical community or by legal and religious scholars. Heart-beating or non-heart-beating organ procurement from patients with impaired consciousness is de facto a concealed practice of physician-assisted death, and therefore, violates both criminal law and the central tenet of medicine not to do harm to patients. Society must decide if physician-assisted death is permissible and desirable to resolve the conflict about procuring organs from patients with impaired consciousness within the context of the perceived need to enhance the supply of transplantable organs. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:248 HISTORY OF PHILOSOPHY be taken from a philosophical point of view. Since it is not certain whether the author of the Prolegomena was or was not a Christian (p. xlix), "god" should not be capitalized, and the translation of T&~ia 5~l~ttovo'f~l~taTa as "God's creation" at IV. 15. 6 is actually misleading. Moreover, for no apparent reason, 0~oX07tz6gis translated as "metaphysical" in the first four chapters, but as "theological" (...) thereafter. Inaccuracies are very few indeed. "Ungrateful" is peculiar for o~5~5t• at I. 2. 25, and so is "adapted state" for ~to~tTe[a~ ~no~ae0g at I. 5.35; X. 26. 38, 40, and 44; at II. 10. 11, there is no need to translate o~Te&0t~6)g bu~yovxctL as "they do not aim at accurate expression," and on p. 32, line 1, "as yet" is not in the Greek of the Prolegomena, although it should have been, if the Anonymous had quoted correctly from Plato, Phaedrus 229 E. But this is trifling criticism of a work which leaves nothing to be desired in any other respect, and which displays the same high qualities of scholarship which we have come to expect of the author on the basis of his earlier achievements. MARTIN OSTWALI) Swarthmore College The Fountain of Life (Fons Vitae). By Solomon ibn Gabirol (Avicebron). Specially abridged edition, translated from the Latin by Harry E. Wedeck, with an Introduction by Theodore E. James. (New York: Philosophical Library, 1962. Unpaged introduction, 133 pp. $4.75.) The romance of the nineteenth-century discovery, by Salomon Munk, that "Avicebron's" Fons Vitae, a major source of neoplatonic thought in the thirteenth and fourteenth centuries, was actually the work of the eleventhcentury Hispano-Jewish poet, Solomon ibn Gabirol, and has often been retold. It is, indeed, a remarkable story. Perhaps its most noteworthy feature is that it reveals how closely alike Muslim, Jewish, and Christian philosophers were; by implication, then, it indicates that theological considerations were of less importance in medieval philosophy than is suggested by most historical accounts. Although the story of The Fountain of Lqe has now become an oft-told tale, the work itself has never been available in English dress. The present edition remedies this situation in part. It presents Tract III of the original text, a section dealing with the existence of simple spiritual substances. Harry Wedeck's translation is lucid and readable. Theodore E. James's introduction is useful for the beginning student but too elementary to be of much use to a more advanced reader. It is good that there is now this much to recommend to our students; we may hope that the day will come when BOOK REVIEWS 249 larger sections of the work will be translated-preferably not from the Latin, but from the Arabic original. JOSEPHL. B~u Columbia University Commentary on the Metaphysics of Aristotle. By St. Thomas Aquinas. Trans. by John P. Rowan. (Chicago, Illinois: Henry Regnery Company, 1961. Pp. xxiii + 955.2 vols., boxed, $25.00.) Generally speaking, the two Summae of St. Thomas, long available in English translation, contain all that is most personal and most profound in his philosophical thought. Nonetheless, it is quite impossible to get a fully adequate conception of St. Thomas' place in the history of western thought from a consideration of his theological writings alone. Hence, by translating St. Thomas' Commentary on the Metaphysics of Aristotle into English, Professor J. P. Rowan has provided the non-Latin reading student of the history of philosophy an invaluable service. For it is in his r61e as Aristotelian commentator that we see St. Thomas creating for the Schoolmen a version of Aristotle which served to render the Stagirite's thought into terms which became fundamental to the philosophical defense of Christianity. Further, by keeping in mind the fully-developed notions of St. Thomas on the existence of God and the nature of being as these are given us to understand in the Summae, the reader becomes better enabled, by a critical reading of Thomas' Commentary, to grasp the sense in which the Saint's theological writings are said by his enthusiasts to represent a "completing" and "perfecting" of... (shrink)

In challenging Marxist theorists to confront the radical rebirth at the core of the fascist revolution, Roger Griffin has carried fascist studies to a new and valuable plateau. Likewise, David D. Roberts’s elaboration of Griffin’s model offers a provocative and fruitful avenue to rethink fascist political culture. This article seeks to advance the dialogue to the next level by considering what an international approach can add to these primarily nationalist interpretations of generic fascism. Drawing on examples from the history of (...) the United States, I argue that fascism is a fundamentally cosmopolitan process and that it needs to be placed on a broader continuum with the histories of slavery, racism and nationalism. (shrink)