A brief review is given of the continuous spontaneous localization (CSL) model, in which a classical field interacts with quantized particles to cause dynamical wavefunction collapse. One of the model's predictions is that particles “spontaneously” gain energy at a slow rate. When applied to the excitation of a nucleon in a Ge nucleus, it is shown how a limit on the relative collapse rates of neutron and proton can be obtained, and a rough estimate is made from data. When applied (...) to the spontaneous excitation of 1s electrons in Ge, by a more detailed analysis of more accurate data than given previously, an updated limit is obtained on the relative collapse rates of the electron and proton, suggesting that the coupling of the field to electrons and nucleons is mass proportional. (shrink)

The continuous spontaneous localization (CSL) model modifies Schrödinger's equation so that the collapse of the state vector is described as a physical process (a special interaction of particles with a universal fluctuating field). A consequence of the model is that an electron in an atom should occasionally get “spontaneously” knocked out of the atom. The CSL ionization rate for the 1s electrons in the Ge atom is calculated and compared with an experimental upper limit for the rate of “spontaneously” generated (...) x-ray pulses in Ge. This gives, for the first time, an experimental constraint on the parameters which characterize this model (the GRW parameters and the relative collapse rate of electrons and nucleons). It is concluded that the values assigned to the GRW parameters by GRW may be maintained only if the coupling of electrons to the fluctuating field is 0.35% or less than the coupling of nucleons, suggestive of a mass-proportional (and therefore gravitational) collapse mechanism. For other allowed values of the GRW parameters, it is still argued that nucleons should collapse more rapidly than electrons. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:BOOK REVIEWS 337 Quodlibetal Questions. By WILLIAM OF OcKHAM. Vol. 1 trans. Alfred J. Freddoso and Francis E. Kelley; vol. 2 trans. Alfred J. Freddoso ; pref. Norman Kretzmann. Vol. l of the Yale Library of Medieval Philosophy. New Haven and London: Yale University Press, 1991. Pp. 391 and 305. $100.00 for both (cloth). In these handsome volumes, Professor Alfred J. Freddoso and the late Professor Frank E. (...) Kelley have provided the scholarly community with an English translation of William of Ockham's Quodlibeta septem (hereafter QS). The volumes constitute the first volume in the new Yale Library of Medieval Philosophy, and both the new series and this first contribution within it will add generously to the growing num· her of medieval philosophical texts available in English. Using the critical edition of Ockham's Latin text established by the Rev. Joseph C. Wey (Opera theologica, vol. 9, Franciscan Institute: St. Bonaventure, NY, 1980) as the basis for their work, the translators offer to readers of English an accurate translation of one of Ockham's mature theological works, treating a wide variety of philosophical and theological topics. Indeed, thanks to their efforts, the broad range of Ockham's thought in natural and revealed theology, ontology, epistemology, and ethics becomes available in English for the first time. The purpose of the Yale series is to translate into English " complete works of philosophical and historical importance". In deciding which work of Ockham to translate for the series, the translators faced two potential hazards: the danger of translating one of Ockham's earlier works that might contain ideas which he subsequently reconsidered; and the danger of translating a work that focused upon a narrow range of topics, something which would give readers the false impression that Ockham's philosophy was concerned only with those topics. The translators have adroitly managed to avoid both of these potential hazards. The translators certainly steered clear of the first hazard by deciding to translate Ockham's QS. These quodlibetal questions are believed to represent the substance of disputations Ockham held at the Franciscan studium in London during the years 1322-1324, although the final written form of the work probably was not established until 1325 or shortly thereafter at Avignon. Hence the QS represent to a large extent Ockham's final word on the topics discussed, since in the period after 1325 up until the time of his death in 1347 Ockham was too heavily embroiled in ecclesiological and political controversies in Avignon and Munich to give much consideration to more speculative concerns. Yet the translators also avoided the second hazard by choos- 338 BOOK REVIEWS ing to translate the QS. True, the QS is akin to numerous other medieval quodlibetal questions in that it treats an array of questions; hut, in the case of Ockham's work, the range of topics is so broad and the issues broached therein so fundamental to his personal thought that one has, in effect, a compendium of Ockham's major philosophical and theological ideas. A brief glance at the table of questions indicates the breadth of the questions and their relevance to perennial philosophical discussions. In the area of philosophical theology, Ockham asks whether it can be proved by natural reason that there is only one God; whether it can be proved by natural reason that God's power is infinite; whether God could have made the world from eternity. In regard to ethical theory, Ockham asks whether the exterior act has its own proper moral goodness, and whether there can be a demonstrative science about morals. In fields of epistemology and the philosophy of mind, Ockham asks whether the human intellect knows its own acts intuitively in this life; whether it knows sensible things intuitively; and whether there can be an intuitive cognition of a non-existent object. Closer to the area of logic and semantics, Ockham raises several questions about the status of propositions and their components: whether a mental proposition is composed of things or concepts; whether mental names are divided into concrete and abstract names in the manner of spoken names; whether the object of a definition is an extra-mental reality or a concept. Finally, readers... (shrink)

In Concepts, Kinds, and Cognitive Development, Frank C. Keil provides a coherent account of how concepts and word meanings develop in children, adding to our understanding of the representational nature of concepts and word meanings at all ages. Keil argues that it is impossible to adequately understand the nature of conceptual representation without also considering the issue of learning. Weaving together issues in cognitive development, philosophy, and cognitive psychology, he reconciles numerous theories, backed by empirical evidence from nominal kinds (...) studies, natural-kinds studies, and studies of fundamental categorical distinctions. He shows that all this evidence, when put together, leads to a better understanding of semantic and conceptual development. The book opens with an analysis of the problems of modeling qualitative changes in conceptual development, investigating how concepts of natural kinds, nominal kinds, and artifacts evolve. The studies on nominal kinds document a powerful and unambiguous developmental pattern indicating a shift from a reliance on global tabulations of characteristic features to what appears to be a small set of defining ones. The studies on natural kinds document an analogous shift toward a core theory instead of simple definition. Both sets of studies are strongly supported by cross cultural data. While these patterns seem to suggest that the young child organizes concepts according to characteristic features, Keil argues that there is a framework of conceptual categories and causal beliefs that enables even very young children to understand kinds at a deeper, theoretically guided, level. This account suggests a new way of understanding qualitative change and carries strong implications for how concepts are represented at any point in development. A Bradford Book. (shrink)

We attempt to extend the nominalistic project initiated in Hartry Field's Science Without Numbers to modern physical theories based in differential geometry.

We pose and resolve several vexing decision theoretic puzzles. Some are variants of existing puzzles, such as 'Trumped' (Arntzenius and McCarthy 1997), 'Rouble trouble' (Arntzenius and Barrett 1999), 'The airtight Dutch book' (McGee 1999), and 'The two envelopes puzzle' (Broome 1995). Others are new. A unified resolution of the puzzles shows that Dutch book arguments have no force in infinite cases. It thereby provides evidence that reasonable utility functions may be unbounded and that reasonable credence functions need not be countably (...) additive. The resolution also shows that when infinitely many decisions are involved, the difference between making the decisions simultaneously and making them sequentially can be the difference between riches and ruin. Finally, the resolution reveals a new way in which the ability to make binding commitments can save perfectly rational agents from sure losses. (shrink)

This book takes up the central themes of Aristotle's metaphysical theory and the various transformations they undergo prior to their full expression in the Metaphysics. Aristotle's metaphysics is bedevilled by classic puzzles involving such notions as form, predication, universal, and substance, which result from his attempt to adapt the various requirements on primary substance developed in his earlier works so that they fit the very different metaphysical picture in his later work. Professor Lewis argues that Aristotle is himself aware of (...) most if not all of these difficulties and in the Metaphysics works hard to ensure the coherence of his theory. He presents Aristotle's views as a formal theory complete with axioms, definitions, and theorems. (shrink)

It is a commonplace within philosophy that the ontology of institutions can be captured in terms of constitutive rules. What exactly such rules are, however, is not well understood. They are usually contrasted to regulative rules: constitutive rules (such as the rules of chess) make institutional actions possible, whereas regulative rules (such as the rules of etiquette) pertain to actions that can be performed independently of such rules. Some, however, maintain that the distinction between regulative and constitutive rules is merely (...) a linguistic one. In this paper I present the status account of constitutive rules in order to address this criticism. According to the status account constitutive rules pertain to institutional statuses and statuses are to be understood in terms of status rules. Status rules concern the enabling and constraining roles of institutions, and constitutive rules specify the preconditions that have to be met in order for them to play these roles. Even though I end up endorsing the claim that the distinction mentioned is a linguistic one, I go on to argue that there is an underlying reality that constitutive rules serve to make apparent. (shrink)

We investigate the problem of how nonnatural entities are represented by examining university students’ concepts of God, both professed theological beliefs and concepts used in comprehension of narratives. In three story processing tasks, subjects often used an anthropomorphic God concept that is inconsistent with stated theological beliefs; and drastically distorted the narratives without any awareness of doing so. By heightening subjects’ awareness of their theological beliefs, we were able to manipulate the degree of anthropomorphization. This tendency to anthropomorphize may be (...) generalizable to other agents. God (and possibly other agents) is unintentionally anthropomorphized in some contexts, perhaps as a means of representing poorly understood.. (shrink)

I argue that it may well be the case that space and time do not consist of points, indeed that they have no smallest parts. I examine two different approaches to such pointless spaces : a topological approach and a measure theoretic approach. I argue in favor of the measure theoretic approach.

Space, Time, and Stuff is an attempt to show that physics is geometry: that the fundamental structure of the physical world is purely geometrical structure. Along the way, he examines some non-standard views about the structure of spacetime and its inhabitants, including the idea that space and time are pointless, the idea that quantum mechanics is a completely local theory, the idea that antiparticles are just particles travelling back in time, and the idea that time has no structure whatsoever. The (...) main thrust of the book, however, is that there are good reasons to believe that spaces other than spacetime exist, and that it is the existence of these additional spaces that allows one to reduce all of physics to geometry. Philosophy, and metaphysics in particular, plays an important role here: the assumption that the fundamental laws of physics are simple in terms of the fundamental physical properties and relations is pivotal."--P. [4] of cover. (shrink)

The linguistic input children receive across early childhood plays a crucial role in shaping their knowledge about the world. To study this input, researchers have begun applying distributional semantic models to large corpora of child‐directed speech, extracting various patterns of word use/co‐occurrence. Previous work using these models has not measured how these patterns may change throughout development, however. In this work, we leverage natural language processing methods—originally developed to study historical language change—to compare caregivers' use of words when talking to (...) younger versus older children. Some words' usage changed more than others; this variability could be predicted based on the word's properties at both the individual and category levels. These findings suggest that caregivers' changing patterns of word use may play a role in scaffolding children's acquisition of conceptual structure in early development. (shrink)

The ‘Principal Principle’ states, roughly, that one's subjective probability for a proposition should conform to one's beliefs about that proposition's objective chance of coming true. David Lewis has argued (i) that this principle provides the defining role for chance; (ii) that it conflicts with his reductionist thesis of Humean supervenience, and so must be replaced by an amended version that avoids the conflict; hence (iii) that nothing perfectly deserves the name ‘chance’, although something can come close enough by playing the (...) role picked out by the amended principle. We show that in fact there must be ‘chances’ that perfectly play what Lewis takes to be the defining role. But this is not the happy conclusion it might seem, since these ‘chances’ behave too strangely to deserve the name. The lesson is simple: much more than the Principal Principle—more to the point, much more than the connection between chance and credence—informs our understanding of objective chance. 1 Introduction 2 Preliminaries 3 Undermining futures and the New Principle 4 The Old Principle rescued? 5 The New Bug 6 Conclusion. (shrink)

Richard Feynman has claimed that anti-particles are nothing but particles `propagating backwards in time'; that time reversing a particle state always turns it into the corresponding anti-particle state. According to standard quantum field theory textbooks this is not so: time reversal does not turn particles into anti-particles. Feynman's view is interesting because, in particular, it suggests a nonstandard, and possibly illuminating, interpretation of the CPT theorem. In this paper, we explore a classical analog of Feynman's view, in the context of (...) the recent debate between David Albert and David Malament over time reversal in classical electromagnetism. (shrink)

Edited by Susan E. Carey, Harvard University, Cambridge, MA, and approved October 18, 2007 (received for review May 11, 2007).

Recent years have seen a significant increase in stakeholder pressure on firms to be not only economically sustainable but also from an environmental and social perspective. Besides operational changes in practices and products companies have reacted toward this increased pressure from a strategic perspective through structural changes of their top management team. A recent addition to the TMT has been the appointment of the chief officer of corporate social responsibility. In this paper, we take a behavioral perspective and investigate how (...) the employment of a chief officer of CSR to the TMT impact on firm performance. Specifically, we explore how certain characteristics of the newly appointed chief executive of CSR impact on a firm’s financial performance. We collected secondary, longitudinal data of listed companies in the United States. Results indicate that appointing a chief executive of CSR does under certain conditions and characteristics result in financial performance benefits. Furthermore, the greatest financial performance benefits can be achieved if the appointee is female and has a CSR functional background. (shrink)

This paper explores the consequences of applying two natural ideas from epistemology to decision theory: (1) that knowledge should guide our actions, and (2) that we know a lot of non-trivial things. In particular, we explore the consequences of these ideas as they are applied to standard decision theoretic puzzles such as the St. Petersburg Paradox. In doing so, we develop a “knowledge-first” decision theory and we will see how it can help us avoid fanaticism with regard to the St. (...) Petersburg puzzle and related puzzles. The result will be a decision theory that gives a novel, but well-motivated, reason for discounting small probabilities when making decisions. We examine the merits and demerits of such a decision theory. (shrink)

Paradoxical results concerning judgment aggregation have recently been invoked to defend the thesis that a corporate agent can be morally responsible for a decision without any of its individual members bearing such responsibility. I contend that the arguments offered for this irreducibility thesis are inconclusive. They do not pay enough attention to how we evaluate individual moral responsibility, in particular not to the role that a flawed assessment of the normative reasons that bear on the issue to be decided on (...) play in this context. I go on to propose a method for distributing corporate responsibility to individual members within the judgment aggregation framework. (shrink)

I start off by relating the standard philosophical account of what time travel is to models of time travel that have recently been discussed by physicists. I then discuss some puzzles associated with time travel. I conclude that philosophers’ arguments against time travel are relevant when assessing the likelihood of the occurrence time travel in our world, and are relevant to the assessment whether time travel is physically possible.

Time travel has been a staple of science fiction. With the advent of general relativity it has been entertained by serious physicists. But, especially in the philosophy literature, there have been arguments that time travel is inherently paradoxical. The most famous paradox is the grandfather paradox: you travel back in time and kill your grandfather, thereby preventing your own existence. To avoid inconsistency some circumstance will have to occur which makes you fail in this attempt to kill your grandfather. Doesn't (...) this require some implausible constraint on otherwise unrelated circumstances? We examine such worries in the context of modern physics. (shrink)

Two studies with 3-, 4-, and 5-year-olds (N 104) examined whether young children can differentiate expertise in the minds of others. Study 1 revealed that all children in the sample could correctly attribute observable knowledge to familiar experts (i.e., a doctor and a car mechanic). Further, 4- and 5-year-olds could correctly attribute knowledge of underlying scientific principles to the appropriate experts. In contrast, Study 2 demonstrated that 3-, 4-, and 5-year-olds have difficulty making attributions of knowledge of scientific principles to (...) unfamiliar experts. A computational analysis in Study 3 indicated that 4- and 5-year-olds’ successes on the first two studies could not be attributed to the way in which words co-occur in discourse. Overall, these studies showed that young children have a sense of the division of cognitive labor, albeit fragile. (shrink)

Historicism -- Time -- Interpretation -- Representation -- Reference -- Truth -- Meaning -- Presence -- Experience (I) -- Experience (II) -- Subjectivity -- Politics.

In this paper the system IL for relative interpretability is studied.

The frequencies with which photons pass through half-silvered mirrors in the forward direction of time is always approximately 1/2, whereas the frequencies with which photons pass through mirrors in the backward direction in time can be highly time-dependent. I argue that whether one should infer from this time-asymmetric phenomenon that time has an objective direction will depend on one's interpretation of quantum mechanics.

Turgot, Baron de l'Aulne: The future of mind.--Marquis de Condorcet: The taming of the future.--Comte de Saint-Simon: The pear is ripe.--Children of Saint-Simon: The triumph of love.--Charles Fourier: The burgeoning of instinct.--Auguste Comte: Embodiment in the great being.

Many phenomena in the world display a striking time-asymmetry: the forwards transition frequencies are approximately invariant while the backwards ones are not. I argue in this paper that theories of such phenomena will entail that time has a direction, and that quantum mechanics in particular entails that the future is objectively different from the past.

The two envelope paradox can be dissolved by looking closely at the connection between conditional and unconditional expectation and by being careful when summing an infinite series of positive and negative terms. The two envelope paradox is not another St. Petersburg paradox and that one does not need to ban talk of infinite expectation values in order to dissolve it. The article ends by posing a new puzzle to do with infinite expectations.

Die {raquo}Revolution der Denkart{laquo} hat nicht nur den Anlauf genommen, welchem sie ihren Namen verdankt.! Gezahlt werden noch weitere Umstellungen der Theorie bildung als bloG die kopernikanische Kants. Hier interessieren gleich zwei. Die eine liefert den Gegenstand, die entsprechende, RevolutionPhanomenologie.

Strong reciprocity is an effective way to promote cooperation. This is especially true when one not only cooperates with cooperators and defects on defectors (second-party punishment) but even punishes those who defect on others (third-party, “altruistic” punishment). Some suggest we humans have a taste for such altruistic punishment and that this was important in the evolution of human cooperation. To assess this we need to look across a wide range of cultures. As part of a cross-cultural project, I played three (...) experimental economics games with the Hadza, who are hunter-gatherers in Tanzania. The Hadza frequently engaged in second-party punishment but they rarely engaged in third-party punishment. Other small-scale societies engaged in less third-party punishment as well. I suggest third-party punishment only became more important in large, complex societies to solve more pressing collective-action problems. (shrink)

One of our great contemporary scientists presents ten insights that illuminate what every thinking person needs to know about what the world is and how it works. Nobel Prize winner Frank Wilczek's Fundamentals is built around a simple but profound idea: the models of the world we construct as children are practical and adequate for everyday life, but they do not bring in the surprising and mind-expanding revelations of modern science. To do that, we must look at the world (...) anew, combining clear thinking with an openness to wonder. This "born again" world is in many ways larger, fuller, and much stranger than it appears. Through an exploration of space, time, matter, and ideas--and equipped with facts, questions, and brilliant speculations--Wilczek guides us through the past, present, and future of fundamental science. Readers will emerge with an expanded vision of our universe. Author Bio: Frank Wilczek won the Nobel Prize in Physics in 2004 for work he did as a graduate student. He was among the earliest MacArthur fellows, and has won many awards both for his scientific work and his writing. He is the author of A Beautiful Question, The Lightness of Being, Fantastic Realities, Longing for the Harmonies, and hundreds of articles in leading scientific journals. His "Wilczek's Universe" column appears regularly in the Wall Street Journal. Wilczek is the Herman Feshbach Professor of Physics at the Massachusetts Institute of Technology, founding director of the T. D. Lee Institute and chief scientist at the Wilczek Quantum Center in Shanghai, China, and a distinguished professor at Arizona State University and Stockholm University. (shrink)

In 1995 the People's Republic of China passed a controversial Eugenics Law, which, after a torrent of international criticism, was euphemistically renamed the Maternal and Infant Health Law. Aimed at "the implementation of premarital medical checkups" to ensure that neither partner has any hereditary, venereal, reproductive, or mental disorders, the ordinance implies that those deemed "unsuitable for reproduction" should undergo sterilization or abortion or remain celibate in order to prevent "inferior births." Using this recent statute as a springboard, Frank (...) Dikötter explores the contexts and history of eugenics in both Communist China and Taiwan. Dikötter shows how beginning in Late Imperial China, Western eugenics was imported and combined with existing fears of cultural, racial, or biological degeneration in Chinese society, leading to government regulation of sexual reproduction. _Imperfect Conceptions_ is a revealing look at the cultural history of medical explanations of birth defects that demonstrates how Chinese assumptions about the relationship of the individual to society form the very core of their attitudes toward procreation. Dikötter explains the patrilineal model of descent, where a person is viewed as the culmination of his or her ancestors and is held responsible for the health of all future generations. By this logic, a pregnant woman's behavior and attitude directly influence the well-being of her baby, and a deformed or retarded child reflects a moral failing on the part of the parents. Dikötter also shows how the holistic medicine practiced in China blurs any distinction between individual and environment so that people are held responsible for illness. Drawing on cultural, social, economic, and political approaches, Dikötter goes beyond a simple authoritarian model to provide a more complex view of eugenic policy, showing how a variety of voices including those of popular journalists, social reformers, medical writers, sex educators, university professors, and politicians all disseminate information that supports rather than questions the state's program. _Imperfect Conceptions_ reveals how Chinese cultural currents--fear and fascination with the deviant and the urge to draw clear boundaries between the normal and the abnormal--have combined with medical discourse to form a program of eugenics that is viewed with alarm by the rest of the world. (shrink)

Though the geographic dimensions of philosophical history were always, in principle at least, the whole globe, for the last two thousand years the ...

Secular change in sex ratios is examined in relation to experience in the family. Two theoretical perspectives are outlined: Guttentag and Secord’s (1983) adaptation of social exchange theory, and sexual selection theory. Because of large-scale change in number of births and typical age differentials between men and women at marriage, low sex ratios at couple formation ages existed in the U.S. between 1965 and the early 1980s. The currently high sex ratios, however, will persist until the end of the century. (...) High sex ratios appear to be associated with lower divorce rates, male commitment to careers that promise economic rewards, male willingness to engage in child care, higher fertility, and higher rates of sexual violence. Sexual selection theory calls attention to intrasexual competition in the numerically larger sex. (shrink)