In his article on The Liabilities of Mobility, Merker asserts that “Consciousness presents us with a stable arena for our actions—the world …” and argues for this property as providing evolutionary pressure for the evolution of consciousness. In this commentary, I will explore the implications of Merker’s ideas for consciousness in artificial agents as well as animals, and also meet some possible objections to his evolutionary pressure claim.

Baars (1988, 1997) has proposed a psychological theory of consciousness, called global workspace theory. The present study describes a software agent implementation of that theory, called ''Conscious'' Mattie (CMattie). CMattie operates in a clerical domain from within a UNIX operating system, sending messages and interpreting messages in natural language that organize seminars at a university. CMattie fleshes out global workspace theory with a detailed computational model that integrates contemporary architectures in cognitive science and artificial intelligence. Baars (1997) lists the psychological (...) ''facts that any complete theory of consciousness must explain'' in his appendix to In the Theater of Consciousness; global workspace theory was designed to explain these ''facts.'' The present article discusses how the design of CMattie accounts for these facts and thereby the extent to which it implements global workspace theory. (shrink)

Recently, there has been a resurgence of interest in general, comprehensive models of human cognition. Such models aim to explain higher-order cognitive faculties, such as deliberation and planning. Given a computational representation, the validity of these models can be tested in computer simulations such as software agents or embodied robots. The push to implement computational models of this kind has created the field of artificial general intelligence (AGI). Moral decision making is arguably one of the most challenging tasks for computational (...) approaches to higher-order cognition. The need for increasingly autonomous artificial agents to factor moral considerations into their choices and actions has given rise to another new field of inquiry variously known as Machine Morality, Machine Ethics, Roboethics, or Friendly AI. In this study, we discuss how LIDA, an AGI model of human cognition, can be adapted to model both affective and rational features of moral decision making. Using the LIDA model, we will demonstrate how moral decisions can be made in many domains using the same mechanisms that enable general decision making. Comprehensive models of human cognition typically aim for compatibility with recent research in the cognitive and neural sciences. Global workspace theory, proposed by the neuropsychologist Bernard Baars (1988), is a highly regarded model of human cognition that is currently being computationally instantiated in several software implementations. LIDA (Franklin, Baars, Ramamurthy, & Ventura, 2005) is one such computational implementation. LIDA is both a set of computational tools and an underlying model of human cognition, which provides mechanisms that are capable of explaining how an agent’s selection of its next action arises from bottom-up collection of sensory data and top-down processes for making sense of its current situation. We will describe how the LIDA model helps integrate emotions into the human decision-making process, and we will elucidate a process whereby an agent can work through an ethical problem to reach a solution that takes account of ethically relevant factors. (shrink)

The currently leading cognitive theory of consciousness, Global Workspace Theory,1,2 postulates that the primary functions of consciousness include a global broadcast serving to recruit internal resources with which to deal with the current situation and to modulate several types of learning. In addition, conscious experiences present current conditions and problems to a "self" system, an executive interpreter that is identifiable with brain structures like the frontal lobes and precuneus.1Be it human, animal or artificial, an autonomous agent3 is said to be (...) functionally conscious if its control structure (mind) implements Global Workspace Theory and the LIDA Cognitive Cycle, which includes unconscious memory and control functions needed to integrate the conscious component of the system. We would therefore consider humans, many animals4 and even some virtual or robotic agents5,6 to be functionally conscious. Such entities may approach phenomenal consciousness, as found in human and other biological brains, as additional brain-like features are added.Here we argue that adding mechanisms to produce a stable, coherent perceptual field7 in a LIDA controlled mobile robot might provide a small but significant step toward phenomenal consciousness in machines.>8 We also propose that implementing several of the various notions of self in such a LIDA controlled robot may well prove another step toward phenomenal consciousness in machines. (shrink)

The currently leading cognitive theory of consciousness, Global Workspace Theory,1,2 postulates that the primary functions of consciousness include a global broadcast serving to recruit internal resources with which to deal with the current situation and to modulate several types of learning. In addition, conscious experiences present current conditions and problems to a "self" system, an executive interpreter that is identifiable with brain structures like the frontal lobes and precuneus.1Be it human, animal or artificial, an autonomous agent3 is said to be (...) functionally conscious if its control structure (mind) implements Global Workspace Theory and the LIDA Cognitive Cycle, which includes unconscious memory and control functions needed to integrate the conscious component of the system. We would therefore consider humans, many animals4 and even some virtual or robotic agents5,6 to be functionally conscious. Such entities may approach phenomenal consciousness, as found in human and other biological brains, as additional brain-like features are added.Here we argue that adding mechanisms to produce a stable, coherent perceptual field7 in a LIDA controlled mobile robot might provide a small but significant step toward phenomenal consciousness in machines.>8 We also propose that implementing several of the various notions of self in such a LIDA controlled robot may well prove another step toward phenomenal consciousness in machines. (shrink)

In his article on The Liabilities of Mobility, Merker asserts that “Consciousness presents us with a stable arena for our actions—the world …” and argues for this property as providing evolutionary pressure for the evolution of consciousness. In this commentary, I will explore the implications of Merker’s ideas for consciousness in artificial agents as well as animals, and also meet some possible objections to his evolutionary pressure claim.

After discussing various types of consciousness, several approaches to machine consciousness, software agent, and global workspace theory, we describe a software agent, IDA, that is 'conscious' in the sense of implementing that theory of consciousness. IDA perceives, remembers, deliberates, negotiates, and selects actions, sometimes 'consciously'. She uses a variety of mechanisms, each of which is briefly described. It's tempting to think of her as a conscious artifact. Is such a view in any way justified? The remainder of the paper considers (...) this question. (shrink)

In the target article, Baars has offered both a theory of consciousness and a strategy for scientifically testing the theory. This commentary is intended as an addendum. I'd like to suggest implementing global workspace agents as both an additional strategy toward scientific testing, and as a means of fleshing out the theory.

This commentary connects some of Glenberg's ideas to similar ideas from artificial intelligence. Second, it briefly discusses hidden assumptions relating to meaning, representations, and projectable properties. Finally, questions about mechanisms, mental imagery, and conceptualization in animals are posed.

Cognition, writ broadly to include motivation and emotion, is best conceived of as control structure for autonomous agents . Autonomous agents are situated in a environment. They both sense and act on that environment, over time, so as to effect subsequent sensing. Examples of such agents include humans, animals, some mobile robots, some artificial life creatures (who "live" in a simulated environment on a computer) and some software agents (who "live" in a file system, a database, or on a network). (...) Their actions are in pursuit of their own agendas, as designed in by their maker or programmer, or as evolved and shaped by culture. Each such agent employs some control mechanism whose continual duty is to select the next action. The term "cognition," in its broad sense, refers to the workings of such control mechanisms. (shrink)

Robots, as well as software agents, can be of use in biology as implementations of a theory rather than as simulations of specific real world target systems. Such implementations generate hypotheses rather than representing them. Their behavior is not predicted, but rather observed, and is not expected to duplicate that of a target system. Scientific knowledge is gained through the testing of generated hypotheses.

The importance of the Stability Problem in neurocomputing is discussed, as well as the need for the study of infinite networks. Stability must be the key ingredient in the solution of a problem by a neural network without external intervention. Infinite discrete networks seem to be the proper objects of study for a theory of neural computability which aims at characterizing problems solvable, in principle, by a neural network. Precise definitions of such problems and their solutions are given. Some consequences (...) are explored, in particular, the neural unsolvability of the Stability Problem for neural networks. (shrink)

Top-down dynamical models of cognitive processes, such as the one presented by Thelen et al., are important pieces in understanding the development of cognitive abilities in humans and biological organisms. Unlike standard symbolic computational approaches to cognition, such dynamical models offer the hope that they can be connected with more bottom-up, neurologically inspired dynamical models to provide a complete view of cognition at all levels. We raise some questions about the details of their simulation and about potential limitations of top-down (...) dynamical models. (shrink)

Much of our everyday, embodied action comes in the form of smooth coping. Smooth coping is skillful action that has become habituated and ingrained, generally placing less stress on cognitive load than considered and deliberative thought and action. When performed with skill and expertise, walking, driving, skiing, musical performances, and short-order cooking are all examples of the phenomenon. Smooth coping is characterized by its rapidity and relative lack of reflection, both being hallmarks of automatization. Deliberative and reflective actions provide the (...) contrast case. In Dreyfus’ classic view, smooth coping is “mindless” absorption into action, being in the flow, and any reflective thought will only interrupt this flow. Building on the pragmatist account of Dewey, others, such as Sutton, Montero, and Gallagher, insist on the intelligent flexibility built into smooth coping, suggesting that it is not equivalent to automatization. We seek to answer two complementary challenges in this article. First, how might we model smooth coping in autonomous agents at fine granularity? Second, we use this model of smooth coping to show how we might implement smooth coping in artificial intelligent agents. We develop a conceptual model of smooth coping in LIDA. LIDA is an embodied cognitive architecture implementing the global workspace theory of consciousness, among other psychological theories. LIDA’s implementation of consciousness enables us to account for the phenomenology of smooth coping, something that few cognitive architectures would be able to do. Through the fine granular analysis of LIDA, we argue that smooth coping is a sequence of automatized actions intermittently interspersed with consciously mediated action selection, supplemented by dorsal stream processes. In other words, non-conscious, automatized actions often require occasional bursts of conscious cognition to achieve the skillful and flexible adjustments of smooth coping. In addition, never-conscious dorsal stream information and associated sensorimotor processes provide further online adjustments during smooth coping. To achieve smooth coping in LIDA we introduce a new module to the LIDA cognitive architecture the Automatized Action Selection sub-module. Our complex model of smooth coping borrows notions of “embodied intelligence” from enactivism and augments these by allowing representations and more detailed mechanisms of conscious control. We explore several extended examples of smooth coping, starting from basic activities like walking and scaling up to more complex tasks like driving and short-order cooking. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:A Response to Elizabeth Gould, “The Nomadic Turn: Epistemology, Experience, and Women College Band Directors”Stephen Franklin ZdzinskiI want to thank Elizabeth Gould for providing us with a thought-provoking paper examining the journeys of women university band directors through a post-modernist and feminist perspective. As a music education professor who deals with students from undergraduate through doctoral levels, I have the opportunity to provide professional guidance to many students, (...) both female and male. A number of my female instrumental music education students ask me about becoming high school and university band directors. I want to be honest with them about the realities of the profession, but I want also to encourage them to pursue their [End Page 195] professional dreams and goals despite any potential structural limitations. I found this paper to provide me with very good insights that I can use to advise my students.According to Gould, there are a number of factors that contribute to the under-representation of women in the field of college band directing. For example, we can see that historically the first band directors and instrumental music educators came either from military or professional performance backgrounds and as a result, most instrumental music teachers were initially male. In addition, early college band organizations, particularly marching musical organizations, were entirely male in composition. While these conditions have not continued to the present day, they set the stage for what was to follow.Socialization and Women University Band DirectorsThe different socialization of girls and boys may also be found to play a role in the under-representation of women as university band directors. A number of researchers have found gender differences in instrument selection,1 and other research points to additional familial socialization differences by gender.2According to Paul Woodford,3 the primary socialization of music education majors and the formation of a music teacher's identity occur during their own pre-collegiate schooling. Several researchers have suggested that precollegiate teaching experiences may be influential in decisions to choose music teaching as a career.4 Through countless hours of observation in their own programs, female and male students may be socialized to professional expectations of band directing before they ever enter a university-based instrumental music education program. Sylvia Tibbets, Winifred Shepard and David Hess, Stan Albrecht, Philip Griswold, and Denise Chroback all found that instrumental music teaching was viewed by both children and adults as a masculine profession.5 Woodford found that many of our current teacher education programs merely recreate existing practices, thus replicating inequitable situations in regards to opportunities for women in the profession of high school and college band directing.6After graduation, the outcome of a gender-influenced instrument choice may be inhibiting the career aspirations of future women band directors. Research by Barry Kopetz examined the influences of gender, school type, and instrument on instrumental music teacher selection by school principals.7 While significant gender differences in favor of males were found, they accounted for only 3% of the variance in teacher selection. Also important was the type of school being attended (performance versus music education institution), also accounting for 3% of the variance. Instrument, on the other hand, accounted for 10% of the variance in teacher selection, with teachers being selected in the following order: [End Page 196] trumpet, clarinet, oboe, and violin. If one examines the instruments commonly played by female instrumentalists, the research by Kopetz may suggest that gender discrimination in band hiring may in fact be exaggerated by playing the "wrong" instrument. If the student in addition comes from a performance-oriented school, that is considered by hiring officials as another negative factor that reduces their job possibilities.Structural Difficulties and Woman University Band DirectorsGould makes an interesting point when she states that while it is useful to know about the reasons for a lack of women in the band directing profession, this information by itself is not going to change things until we actually understand the structural underpinnings of the problem. The use of the metaphor of the nomad is helpful in attempting to explain the structural difficulties inherent in women becoming university band directors. In fact, I... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:A Response to Elizabeth Gould, “The Nomadic Turn: Epistemology, Experience, and Women College Band Directors”Stephen Franklin ZdzinskiI want to thank Elizabeth Gould for providing us with a thought-provoking paper examining the journeys of women university band directors through a post-modernist and feminist perspective. As a music education professor who deals with students from undergraduate through doctoral levels, I have the opportunity to provide professional guidance to many students, (...) both female and male. A number of my female instrumental music education students ask me about becoming high school and university band directors. I want to be honest with them about the realities of the profession, but I want also to encourage them to pursue their [End Page 195] professional dreams and goals despite any potential structural limitations. I found this paper to provide me with very good insights that I can use to advise my students.According to Gould, there are a number of factors that contribute to the under-representation of women in the field of college band directing. For example, we can see that historically the first band directors and instrumental music educators came either from military or professional performance backgrounds and as a result, most instrumental music teachers were initially male. In addition, early college band organizations, particularly marching musical organizations, were entirely male in composition. While these conditions have not continued to the present day, they set the stage for what was to follow.Socialization and Women University Band DirectorsThe different socialization of girls and boys may also be found to play a role in the under-representation of women as university band directors. A number of researchers have found gender differences in instrument selection,1 and other research points to additional familial socialization differences by gender.2According to Paul Woodford,3 the primary socialization of music education majors and the formation of a music teacher's identity occur during their own pre-collegiate schooling. Several researchers have suggested that precollegiate teaching experiences may be influential in decisions to choose music teaching as a career.4 Through countless hours of observation in their own programs, female and male students may be socialized to professional expectations of band directing before they ever enter a university-based instrumental music education program. Sylvia Tibbets, Winifred Shepard and David Hess, Stan Albrecht, Philip Griswold, and Denise Chroback all found that instrumental music teaching was viewed by both children and adults as a masculine profession.5 Woodford found that many of our current teacher education programs merely recreate existing practices, thus replicating inequitable situations in regards to opportunities for women in the profession of high school and college band directing.6After graduation, the outcome of a gender-influenced instrument choice may be inhibiting the career aspirations of future women band directors. Research by Barry Kopetz examined the influences of gender, school type, and instrument on instrumental music teacher selection by school principals.7 While significant gender differences in favor of males were found, they accounted for only 3% of the variance in teacher selection. Also important was the type of school being attended (performance versus music education institution), also accounting for 3% of the variance. Instrument, on the other hand, accounted for 10% of the variance in teacher selection, with teachers being selected in the following order: [End Page 196] trumpet, clarinet, oboe, and violin. If one examines the instruments commonly played by female instrumentalists, the research by Kopetz may suggest that gender discrimination in band hiring may in fact be exaggerated by playing the "wrong" instrument. If the student in addition comes from a performance-oriented school, that is considered by hiring officials as another negative factor that reduces their job possibilities.Structural Difficulties and Woman University Band DirectorsGould makes an interesting point when she states that while it is useful to know about the reasons for a lack of women in the band directing profession, this information by itself is not going to change things until we actually understand the structural underpinnings of the problem. The use of the metaphor of the nomad is helpful in attempting to explain the structural difficulties inherent in women becoming university band directors. In fact, I... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:A Response to Elizabeth Gould, “The Nomadic Turn: Epistemology, Experience, and Women College Band Directors”Stephen Franklin ZdzinskiI want to thank Elizabeth Gould for providing us with a thought-provoking paper examining the journeys of women university band directors through a post-modernist and feminist perspective. As a music education professor who deals with students from undergraduate through doctoral levels, I have the opportunity to provide professional guidance to many students, (...) both female and male. A number of my female instrumental music education students ask me about becoming high school and university band directors. I want to be honest with them about the realities of the profession, but I want also to encourage them to pursue their [End Page 195] professional dreams and goals despite any potential structural limitations. I found this paper to provide me with very good insights that I can use to advise my students.According to Gould, there are a number of factors that contribute to the under-representation of women in the field of college band directing. For example, we can see that historically the first band directors and instrumental music educators came either from military or professional performance backgrounds and as a result, most instrumental music teachers were initially male. In addition, early college band organizations, particularly marching musical organizations, were entirely male in composition. While these conditions have not continued to the present day, they set the stage for what was to follow.Socialization and Women University Band DirectorsThe different socialization of girls and boys may also be found to play a role in the under-representation of women as university band directors. A number of researchers have found gender differences in instrument selection,1 and other research points to additional familial socialization differences by gender.2According to Paul Woodford,3 the primary socialization of music education majors and the formation of a music teacher's identity occur during their own pre-collegiate schooling. Several researchers have suggested that precollegiate teaching experiences may be influential in decisions to choose music teaching as a career.4 Through countless hours of observation in their own programs, female and male students may be socialized to professional expectations of band directing before they ever enter a university-based instrumental music education program. Sylvia Tibbets, Winifred Shepard and David Hess, Stan Albrecht, Philip Griswold, and Denise Chroback all found that instrumental music teaching was viewed by both children and adults as a masculine profession.5 Woodford found that many of our current teacher education programs merely recreate existing practices, thus replicating inequitable situations in regards to opportunities for women in the profession of high school and college band directing.6After graduation, the outcome of a gender-influenced instrument choice may be inhibiting the career aspirations of future women band directors. Research by Barry Kopetz examined the influences of gender, school type, and instrument on instrumental music teacher selection by school principals.7 While significant gender differences in favor of males were found, they accounted for only 3% of the variance in teacher selection. Also important was the type of school being attended (performance versus music education institution), also accounting for 3% of the variance. Instrument, on the other hand, accounted for 10% of the variance in teacher selection, with teachers being selected in the following order: [End Page 196] trumpet, clarinet, oboe, and violin. If one examines the instruments commonly played by female instrumentalists, the research by Kopetz may suggest that gender discrimination in band hiring may in fact be exaggerated by playing the "wrong" instrument. If the student in addition comes from a performance-oriented school, that is considered by hiring officials as another negative factor that reduces their job possibilities.Structural Difficulties and Woman University Band DirectorsGould makes an interesting point when she states that while it is useful to know about the reasons for a lack of women in the band directing profession, this information by itself is not going to change things until we actually understand the structural underpinnings of the problem. The use of the metaphor of the nomad is helpful in attempting to explain the structural difficulties inherent in women becoming university band directors. In fact, I... (shrink)

Featuring an exceptionally clear writing style and a wealth of real-world examples and exercises, Logic, Second Edition, shows how logic relates to everyday life, demonstrating its applications in such areas as the workplace, media and entertainment, politics, science and technology, student life, and elsewhere.Thoroughly revised and expanded in this second edition, the text now features 2600 exercises, more than 1000 of them new; three new chapters on legal arguments, moral arguments, and analyzing a long essay; enhanced pedagogy; and much more.FEATURES* (...) 2600 exercises--more than 1000 of them new--breathe new life into logic* Real-world examples help bring logic down to earth for students* A unique, extended explanation or model of the answer to the first question of each "Check Your Understanding" section shows students what is expected of their answers* An additional 25% of the exercises are answered at the back of the book* "Profiles in Logic" provide short sketches of logicians, philosophers, mathematicians, and others associated with logic* "Logic Challenge" problems present puzzles and paradoxes that end each chapter on a fun note* Additional pedagogical elements--marginal definitions, key terms, a glossary, reference boxes, and bulleted chapter summaries--make the material even more accessible* Detailed guides help students learn to create "truth tables" and Venn diagramsSUPPORT PACKAGEAn Instructor's Manual with Computerized Test Bank on CD includes: Solutions to all exercises in the book, enhanced by explanations and answers that elucidate the details of the correct answersKey Terms and a summary for each chapterA customizable Computerized Test Bank--with multiple-choice, true/false, and fill-in-the-blank questions--that allows instructors to give exams or homework problems that can be auto-gradedA traditional "pencil-and-paper" Test Bank and answer key containing the same questions as the Computerized Test BankPowerPoint-based lecture outlinesThe Instructor's Manual with Computerized Test Bank and the traditional Test Bank are also available in printed format.A Companion Website offers:Instructor Resources :A downloadable version of the Instructor's Manual PowerPoint-based lecture outlinesStudent Resources:Brief chapter summariesInteractive Flash Cards with key terms and definitionsWeb links and other media resourcesPractice quizzes with answers and explanations The Learning Management System Cartridges include, in a fully downloadable format:Instructor's Manual and Computerized Test Bank Student material from the companion websiteThe Perfect Text for Your Course... No Matter How You Teach ItYour course is unique; you have your own teaching philosophy and style. Whether you teach traditional Introduction to Logic, Critical Thinking/Informal Logic, or Formal Logic, Baronett: Logic, Second Edition, can be tailored to fulfill your course needs.We'll make it easy for you; choose one of our Alternate Editions or build the book you want, chapter by chapter.Option 1. Author Stan Baronett has suggested four Alternate Editions that may work for you. Each Alternate Edition comes in full color, with answers to problems, a full glossary, and an index. The books are in stock and available for ordering. Please see the ISBN information below.Logic: Concise EditionChapters 1, 3, 4, 5, 6, 7, 8Order using ISBN: 978-0-19-994129-2Logic: An Emphasis on Critical Thinking and Informal LogicChapters 1, 2, 3, 4, 10, 11, 12, 13 A-E, 14, 15Order using ISBN: 978-0-19-994128-5Logic: An Emphasis on Formal LogicChapters 1, 5, 6, 7, 8, 9Order using ISBN: 978-0-19-994126-1Logic: With Diagramming used in Chapter 4. Informal FallaciesFull textOrder using ISBN: 978-0-19-997081-0Option 2. Create your own customized textbook by choosing the specific chapters that you need for your course. Please contact your Oxford University Press Sales Representative or call 800.280.0280 for details. (shrink)

Logic and truth -- Inferences : assessment, recognition, and reconstruction -- Categorical statements and inferences -- Truth-functional statements -- Truth tables and proofs -- Natural deduction -- The logic of quantifiers -- Logic and language -- Applied inductive analysis.

This paper examines the issue of what the self is by reviewing neuropsychological research,which converges on the idea that the self may be more complex and differentiated than previous treatments of the topic have suggested. Although some aspects of self-knowledge such as episodic recollection may be compromised in individuals, other aspects—for instance, semantic trait summaries—appear largely intact. Taken together, these findings support the idea that the self is not a single, unified entity. Rather, it is a set of interrelated, functionally (...) independent systems. Implications for understanding the self in various areas of psychological research—e.g., neuroimaging, autism, amnesia, Alzheimer’s disease, and mirror self-recognition—are discussed in brief. (shrink)

I argue that the key dynamical concepts and laws of Newton's Principia never gained a solid foothold in Germany before Kant in the 1750s. I explain this absence as due to Leibniz. Thus I make a case for a robust Leibnizian legacy for Enlightenment science, and I solve what Jonathan Israel called “a meaningful historical problem on its own,” viz. the slow and hesitant reception of Newton in pre-Kantian Germany.

: Radical meta-normative skepticism is the view that no standard, norm, or principle has objective authority or normative force. It does not deny that there are norms, standards of correctness, and principles of various kinds that render it possible that we succeed or fail in measuring up to their prerogatives. Rather, it denies that any norm has the status of commanding with objective authority, of giving rise to normative reasons to take seriously and follow its demands. Two powerful transcendental arguments (...) challenge this view. First, skepticism is said to be self-defeating: Settling what to accept, and in particular whether to accept skepticism, appears to be a reason-guided enterprise. How can skeptics coherently support their view by citing reasons in their favor after they just rejected them throughout? Second, there is the practical-deliberative version, most recently developed by David Enoch: We are essentially deliberative creatures. Yet deliberation appears to require that there are correct answers in the form of normative reasons to our practical questions. Thus confidence in the sensible nature of deliberation should inspire confidence in reasons. The essay undermines both transcendental arguments by demonstrating, first, how to support skepticism without deserting its tenets, and, second, how to deliberate in skeptical fashion. (shrink)

This book provides the reader with a detailed and captivating account of the story where, for the first time, physicists ventured into proposing a new force of nature beyond the four known ones - the electromagnetic, weak and strong forces, and gravitation - based entirely on the reanalysis of existing experimental data. Back in 1986, Ephraim Fischbach, Sam Aronson, Carrick Talmadge and their collaborators proposed a modification of Newton's Law of universal gravitation. Underlying this proposal were three tantalizing pieces of (...) evidence: 1) an energy dependence of the CP (particle-antiparticle and reflection symmetry) parameters, 2) differences between the measurements of G, the universal gravitational constant, in laboratories and in mineshafts, and 3) a reanalysis of the Eötvos experiment, which had previously been used to show that the gravitational mass of an object and its inertia mass were equal to approximately one part in a billion. The reanalysis revealed that, contrary to Galileo's position, the force of gravity was in fact very slightly different for different substances. The resulting Fifth Force hypothesis included this composition dependence and also added a small distance dependence to the inverse-square gravitational force. Over the next four years numerous experiments were performed to test the hypothesis. By 1990 there was overwhelming evidence that the Fifth Force, as initially proposed, did not exist. This book discusses how the Fifth Force hypothesis came to be proposed and how it went on to become a showcase of discovery, pursuit and justification in modern physics, prior to its demise. In this new and significantly expanded edition, the material from the first edition is complemented by two essays, one containing Fischbach's personal reminiscences of the proposal, and a second on the ongoing history and impact of the Fifth Force hypothesis from 1990 to the present. <. (shrink)

Does not include all chapters from the main book--publisher's comments.

Argues that morals and politics require on a metaphysical backing and proposes a neoclassical metaphysics.

Although the dream narrative, of (bio)logical necessity, originates with the dreamer, s/he typically does not know this. For the dreamer, the dream world is the real world. In this article I argue that this nightly misattribution is best explained in terms of the concept of mental ownership (e.g., Albahari, 2006; Klein, 2015a; Lane, 2012). Specifically, the exogenous nature of the dream narrative is the result of an individual assuming perspectival, but not personal, ownership of content s/he authored (i.e., “The content (...) in my head is not mine. Therefore it must be peripherally perceived”). Situating explanation within a theoretical space designed to address questions pertaining to the experienced origins of conscious content has a number of salutatory consequences. For example, it promotes predictive fecundity by bringing to light empirical generalizations whose presence otherwise might have gone unnoticed (e.g., the severely limited role of mental time travel within the dream narrative). -/- . (shrink)

Philosophers and others have often debated whether we have freewill: i.e. whether (in a sense I shall try to elucidate) our power to choose between X and Y is radically undetermined, so that if we choose X we yet might have chosen Y, and vice versa. My concern is not with that question but with a hypothetical one which arises from it: if we had such freewill, what implications, if any, would, that fact have for the sciences. My argument concentrates (...) on the social sciences, since the phenomena with which they deal inevitably involves human choice. (shrink)