What might a theory of mental imagery look like, and how might one begin formulating such a theory? These are the central questions addressed in the present paper. The first section outlines the general research direction taken here and provides an overview of the empirical foundations of our theory of image representation and processing. Four issues are considered in succession, and the relevant results of experiments are presented and discussed. The second section begins with a discussion of the proper form (...) for a cognitive theory, and the distinction between a theory and a model is developed. Following this, the present theory and computer simulation model are introduced. This theory specifies the nature of the internal representations (data structures) and the processes that operate on them when one generates, inspects, or transforms mental images. In the third, concluding, section we consider three very different kinds of objections to the present research program, one hinging on the possibility of experimental artifacts in the data, and the others turning on metatheoretical commitments about the form of a cognitive theory. Finally, we discuss how one ought best to evaluate theories and models of the sort developed here. (shrink)

This study invited curates and training incumbents attending a 3-day residential programme to function as a hermeneutical community engaging conversation between the Lucan post-resurrection narrative concerning the Road to Emmaus and the learning relationship in which they were engaged. Building on the SIFT approach to biblical hermeneutics the participants were invited to work in type-alike groups, structured first on the basis of the perceiving process and second on the basis of the judging process. This approach facilitated rich and varied insights (...) into the Emmaus Road narrative and into the theme of learning relationships. (shrink)

The proposal to create a chamber selected by sortition would extend this democratic procedure into the legislative branch of government. However, there are good reasons to believe that, as currently conceived by John Gastil and Erik Olin Wright, the proposal will fail to realize sufficiently two fundamental democratic goods, namely, political equality and deliberative reasoning. It is argued through analysis of its historic and contemporary application that sortition must be combined with other institutional devices, in particular, rotation of membership and (...) limited mandate, in order to be democratically effective and to realize political equality and deliberative reasoning. An alternative proposal for a responsive sortition legislature is presented as more realistic and utopian: one that increases substantially the number of members, makes more extensive use of internal sortition and rotation, and recognizes the importance of establishing limited mandates. (shrink)

This study explores the connection between dominant psychological type preferences and reader interpretations of biblical texts. Working in type-alike groups, a group of 40 Anglican clergy were invited to employ their strongest function to engage conversation between Mark’s account of Jesus sending out the disciples and the experience of ministry in today’s world. The data supported the hermeneutical theory proposed by the SIFT approach to biblical interpretation and liturgical preaching by demonstrating the four clear and distinctive voices of sensing, intuition, (...) feeling and thinking. (shrink)

Cultural influences are pervasive throughout human behaviour, and as human–robot interactions become more common, roboticists are increasingly focusing attention on how to build robots that are culturally competent and culturally sustainable. The current treatment of culture in robotics, however, is largely limited to the definition of culture as national culture. This is problematic for three reasons: it ignores subcultures, it loses specificity and hides the nuances in cultures, and it excludes refugees and stateless persons. We propose to shift the focus (...) of cultural robotics to redefine culture as an emergent phenomenon. We make use of three research programmes in the social and cognitive sciences to justify this definition. Consequently, cultural behaviour cannot be explicitly programmed into a robot, rather, a robot must be designed with the capability to participate in the interactions that lead to the arising of cultural behaviour. In the final part of the paper, we explore which capacities and abilities are the most salient for a robot to do this. (shrink)

Sir Isaac Newton was one of the greatest scientists of all time, a thinker of extraordinary range and creativity who has left enduring legacies in mathematics and the natural sciences. In this volume a team of distinguished contributors examine all the main aspects of Newton's thought, including not only his approach to space, time, mechanics, and universal gravity in his Principia, his research in optics, and his contributions to mathematics, but also his more clandestine investigations into alchemy, theology, and prophecy, (...) which have sometimes been overshadowed by his mathematical and scientific interests. (shrink)

One of the key questions to have exercised green political theorists in recent years concerns the relationship of the environment 'agenda' and democracy. Both environmentalists and democrats have a tendency to think of each other as natural bedfellows but in fact there is little theoretical or practical reason why they should be. Indeed some theorists have argued that the environmental movement has grown from fundamentally authoritarian roots and it is arguable that the only really effective way of implementing environmental politics (...) is by imposing them in an authoritarian manner. This book deals with the tensions between democracy and environmentalism from a variety of theoretical and empirical perspectives. (shrink)

We present a self-organizing approach to sentence processing that sheds new light on notional plurality effects in agreement attraction, using pseudopartitive subject noun phrases. We first show that notional plurality ratings predict verb agreement choices in pseudopartitives, in line with the “Marking” component of the Marking and Morphing theory of agreement processing. However, no account to date has derived notional plurality values from independently needed principles of language processing. We argue on the basis of new experimental evidence and a dynamical (...) systems model that the theoretical black box of notional plurality can be unpacked into objectively measurable semantic features. With these semantic features driving structure formation, our model reproduces the human verb production patterns as a byproduct of normal processing. Finally, we discuss how the self-organizing approach might be extended to other agreement attraction phenomena. (shrink)

This qualitative study was positioned within an emerging scientific field concerned with the interaction between biblical text and the psychological profile of the preacher. The theoretical framework was provided by the sensing, intuition, feeling and thinking (SIFT) approach to biblical hermeneutics, an approach rooted in reader-perspective hermeneutical theory and in Jungian psychological type theory that explores the distinctive readings of sensing perception and intuitive perception, and the distinctive readings of thinking evaluation and feeling evaluation. The empirical methodology was provided by (...) developing a research tradition concerned with applying the SIFT approach to biblical text. In the present study, a group of 17 Anglican clergy were invited to work in psychological type-alike groups to explore two of the biblical passages identified by Year B of the Revised Common Lectionary for the Feast of Christ the King. Dividing into three workshops, according to their preferences for sensing and intuition, the clergy explored Psalm 93. Dividing into three workshops, according to their preferences for thinking and feeling, the clergy explored John 18:33–37. The rich data gathered from these workshops supported the hypothesis that biblical interpretation and preaching may be shaped by the reader’s psychological type preference and suggested that the passages of scripture proposed for the Feast of Christ the King may be a joy for intuitive thinking types, but a nightmare for sensing feeling types. Contribution: Situated within the reader perspective approach to biblical hermeneutics, the SIFT method is concerned with identifying the influence of the psychological type of the reader in shaping the interpretation of text. Employing this method, the present study contributes to the fields of homiletics and hermeneutics by demonstrating how some readers (sensing types) may struggle more than others (intuitive types) to interpret the scripture readings proposed by the lectionary for the Feast of Christ the King. (shrink)

Between 1905 and 1913, French physicist Jean Perrin's experiments on Brownian motion ostensibly put a definitive end to the long debate regarding the real existence of molecules, proving the atomic theory of matter. While Perrin's results had a significant impact at the time, later examination of his experiments questioned whether he really gained experimental access to the molecular realm. The experiments were successful in determining the mean kinetic energy of the granules of Brownian motion; however, the values for molecular magnitudes (...) Perrin inferred from them simply presupposed that the granule mean kinetic energy was the same as the mean molecular kinetic energy in the fluid in which the granules move. This stipulation became increasingly questionable in the years between 1908 and 1913, as significantly lower values for these magnitudes were obtained from other experimental results like alpha-particle emissions, ionization, and Planck's blackbody radiation equation. In this case study in the history and philosophy of science, George E. Smith and Raghav Seth here argue that despite doubts, Perrin's measurements were nevertheless exemplars of theory-mediated measurement-the practice of obtaining values for an inaccessible quantity by inferring them from an accessible proxy via theoretical relationships between them. They argue that it was actually Perrin more than any of his contemporaries who championed this approach during the years in question. The practice of theory-mediated measurement in physics had a long history before 1900, but the concerted efforts of Perrin, Rutherford, Millikan, Planck, and their colleagues led to the central role this form of evidence has had in microphysical research ever since. Seth and Smith's study thus replaces an untenable legend with an account that is not only tenable, but more instructive about what the evidence did and did not show. (shrink)

In recent years regenerative agriculture has attracted growing attention as a means to improve soil health and farmer livelihoods while slowing climate change. With this attention has come increased policy support as well as the launch of private sector programs that promote regenerative agriculture as a form of carbon farming. In the United States many of these programs recruit primarily in regions where large-scale commodity production prevails, such as the Great Plains. There, a decades-old regenerative agriculture movement is growing rapidly, (...) but not due to the incentives offered by companies’ carbon programs. On the contrary, farmers are adopting regenerative practices to cut their dependence on corporate agrochemical inputs and expertise, and to thereby achieve technology sovereignty. These practice changes often strain farmers’ existing social relationships while drawing them into new and previously neglected ones, including the more-than-human relations necessary for building soil health. These new relationships and the knowledge they generate may in turn lead farmers to think differently about their own autonomy. These findings provide insight into farmers’ skepticism of private sector carbon farming programs, and highlight the value of attention to the multiple types of relationship change that accompany and facilitate regenerative transitions. (shrink)

Today’s bodies are akin to ‘walking sensor platforms’. Bodies either host, or are the subjects of, an array of sensing devices that act to convert bodily movements, actions and dynamics into circulative data. This article proposes the notions of ‘disembodied exhaust’ and ‘embodied exhaustion’ to conceptualise processes of bodily sensorisation and datafication. As the material body interfaces with networked sensor technologies and sensing infrastructures, it emits disembodied exhaust: gaseous flows of personal information that establish a representational data-proxy. It is this (...) networked actant that progressively structures how embodied subjects experience their daily lives. The significance of this symbiont medium in determining the outcome of interplays between networked individuals and audiences necessitates that it is carefully contrived. The article explores the nature and function of the data-proxy, and its impact on social relations. Drawing on examples that depict individuals engaging with their data-proxies, the article suggests that managing a virtual presence is analogous to a work relation, demanding diligence and investment. But it also shows how the data-proxy operates as a mode of affect that challenges conventional distinctions made between organic and inorganic bodies, agency and actancy, mortality and immortality, presence and absence. (shrink)

Among theories of human language comprehension, cue‐based memory retrieval has proven to be a useful framework for understanding when and how processing difficulty arises in the resolution of long‐distance dependencies. Most previous work in this area has assumed that very general retrieval cues like [+subject] or [+singular] do the work of identifying (and sometimes misidentifying) a retrieval target in order to establish a dependency between words. However, recent work suggests that general, handpicked retrieval cues like these may not be enough (...) to explain illusions of plausibility (Cunnings & Sturt, 2018), which can arise in sentences like The letter next to the porcelain plate shattered. Capturing such retrieval interference effects requires lexically specific features and retrieval cues, but handpicking the features is hard to do in a principled way and greatly increases modeler degrees of freedom. To remedy this, we use well‐established word embedding methods for creating distributed lexical feature representations that encode information relevant for retrieval using distributed retrieval cue vectors. We show that the similarity between the feature and cue vectors (a measure of plausibility) predicts total reading times in Cunnings and Sturt’s eye‐tracking data. The features can easily be plugged into existing parsing models (including cue‐based retrieval and self‐organized parsing), putting very different models on more equal footing and facilitating future quantitative comparisons. (shrink)

Against the backdrop of cultural and political ideals, this article highlights both the significance of mental health nursing in meeting population needs and the regulatory barriers that may be impeding its ability to adequately do so. Specifically, we consider how ambiguous notions of ‘proficiency’ in nurse education—prescribed by the regulator—impact the development of future mental health nurses and their mental health nursing identity. A key tension in mental health practice is the ethical‐legal challenges posed by sanctioned powers to restrict patients' (...) freedom at the same time as the desire (and obligation) to promote patients' self‐determined recovery. The genericism of the UK's Future Nurse Standards do little to prepare mental health nurses to navigate the tensions that ensue. This has consequences for nurses and patients alike, as both risk experiencing the distress and dissonance that attends giving or receiving poor care. We argue that more needs to be done to enable mental health nurses to define and articulate the nuances of the profession as part of becoming critical, thoughtful and confident practitioners. Educators can contribute to this mission by aligning curriculum, pedagogy and assessment to create meaningful opportunities for mental health nursing students to engage with the complexities of mental health nursing practice. Without this, the credibility of the profession will continue to be questioned; its future uncertain. (shrink)

There is no doubt science is currently suffering from a credibility crisis. This thought-provoking book argues that, ironically, science's credibility is being undermined by tools created by scientists themselves. Scientific disinformation and damaging conspiracy theories are rife because of the internet that science created, the scientific demand for empirical evidence and statistical significance leads to data torturing and confirmation bias, and data mining is fuelled by the technological advances in Big Data and the development of ever-increasingly powerfulcomputers. Using a wide (...) range of entertaining examples, this fascinating book examines the impacts of society's growing distrust of science, and ultimately provides constructive suggestions for restoring the credibility of the scientific community. (shrink)

It is widely believed today that John Duns Scotus’s doctrine of the univocity of being ushered in various deleterious philosophical and theological consequences that resulted in the negative features of modernity. Included in this common opinion, but not examined, is the belief that by affirming univocity Scotus thereby also denied the analogy of being. The present essay challenges this belief by recovering Scotus’s true position on analogy, namely that it obtains in the order of the real, and that complex concepts (...) of creatures are analogically related to complex concepts of God. Scotus’s doctrine is then compared to the later Scotist tradition. The common opinion of the Scotist school from the fourteenth century onward followed Scotus’s position on analogy and considerably expanded upon his scattered remarks. (shrink)

Psalm 139 provides both great opportunities and huge challenges for the preacher. It is a Psalm crafted in four parts: part two is an imaginative and poetic affirmation of God’s omnipresence that engages the Jungian perceiving process; part four is a fierce and uncompromising diatribe against God’s enemies that engages the Jungian judging process. Interpretations of these two sections of the Psalm are explored among a sample of 30 Anglican deacons and priests serving as curates who were invited to work (...) in small hermeneutical communities, structured according to psychological type theory and designed to test the sensing, intuition, feeling and thinking (SIFT) approach to biblical hermeneutics and liturgical preaching. The findings from the hermeneutical communities demonstrated that the poetic power of part two was perceived quite differently by sensing types and by intuitive types. The judgement against God’s enemies in part four was evaluated quite differently by feeling types and by thinking types. The implications of these different readings of sacred text are discussed in relation both to hermeneutical theory and to homiletic practice. (shrink)

This paper explores the embedding of data producing technologies in people's everyday lives and practices. It traces how repeated encounters with digital data operate to naturalise these entities, while often blindsiding their agentive properties and the ways they get implicated in processes of exploitation and governance. I propose and develop the notion of ‘data doxa’ to conceptualise the way in which digital data – and the devices and platforms that stage data – have come to be perceived in Western societies (...) as normal, necessary and enabling. The ‘data doxa’ concept also accentuates the enculturation of many individuals into a data sharing habitus which frames digital technologies in simplistic terms as panaceas for the problems associated with contemporary life, figures of progress and convenience, and mediums of knowledge, pleasure and identity. I suggest that three types of data-based relations contribute to the formation of this doxic sensibility: fetishisation, habit and enchantment. Each of these relations come to mediate public understandings of digital devices and the data they generate, obscuring the multifaceted nature and hidden depths of data and their propensity to double up as technologies of exposure and discipline. As a result of this situation, imaginative educational programs and revamped regulatory frameworks are urgently needed to inform individuals about the contribution of data to the leveraging of value and power in today's digital economies, but also to protect them from experiencing data-based harms. (shrink)

This study is situated within the newly emerging interest in the concept of grace as a legitimate topic for empirical enquiry, and draws on the theoretical framework provided by the SIFT approach to biblical hermeneutics, an approach rooted in reader-perspective hermeneutical theory and in Jungian psychological type theory. Data were draw from two one-day workshops with Anglican Readers (lay ministers). On each occasion the participants were invited to divide into three separate groups according to their preferences for sensing or intuition (...) (the two perceiving functions) and within these groups to explore the messages of grace in Matthew 6: 25–30 (Jesus’ invitation to look at the birds and to consider the lilies). The rich data gathered from these workshops generated insights into contemporary theologies of grace and also confirmed the hypothesis that biblical interpretation is shaped by the reader’s psychological type preference for sensing or for intuition. (shrink)

Among the most influential and enigmatic thinkers of the modern age, Nietzsche and Heidegger have become pivotal in the struggle to define postmodernism. In this work, Gregory Smith offers the most comprehensive examination to date of the turn to postmodernity in the writings of these philosophers. Smith argues that, while much of postmodern thought is rooted in Nietzsche and Heidegger, it has ironically attempted, whether unwittingly or by design, to deflect their philosophy back onto a modern path. Other alternative paths (...) emanating from both Nietzschean and Heideggerian thought that might more powerfully speak to postmodern culture have been ignored. Nietzsche and Heidegger, Smith suggests, have made possible a far more revolutionary critique of modernity then even their most ardent postmodern admirers have realized. Smith contends that the influences on the postmodern in the thought of Nietzsche and Heidegger are founded in a new vision of praxis liberated from theory. Ultimately, these philosophers do transcend the nihilism often found in the guise of postmodernism. Their thought is, moreover, consistent with the possibility of limited constitutional government and the rule of law. Smith's book takes the first step toward recovering these possibilities and posing the fundamental questions of politics and ethics in ways that have heretofore been closed off by late-modern thought. (shrink)

This paper examines the role that attention to emotions around climate change can play for third sector climate change engagement initiatives, an area to which the literature on such initiatives has paid little attention. It focuses on Carbon Conversations, a programme that explicitly acknowledges the role of difficult emotions and underlying values in people's engagement with climate change. While there are limitations to this approach, results show that it can help certain audiences engage more deeply with issues around climate change (...) and carbon reduction. Important lessons can be drawn for other initiatives that aim to engage the public on climate change. (shrink)

Incommensurability between successive scientific theories—the impossibility of empirical evidence dictating the choice between them—was Thomas Kuhn's most controversial proposal. Toward defending it, he directed much effort over his last 30 years into formulating precise conditions under which two theories would be undeniably incommensurable with one another. His first step, in the late 1960s, was to argue that incommensurability must result when two theories involve incompatible taxonomies. The problem he then struggled with, never obtaining a solution that he found entirely satisfactory, (...) was how to extend this initial line of thought to sciences like physics in which taxonomy is not so transparently dominant as it is, for example, in chemistry. This paper reconsiders incommensurability in the light of examples in which evidence historically did and did not carry over continuously from old laws and theories to new ones. The transition from ray to wave optics early in the nineteenth century, we argue, is especially informative in this regard. The evidence for the theory of polarization within ray optics did not carry over to wave optics, so that this transition can be regarded as a prototypical case of discontinuity of evidence, and hence of incommensurability in the way Kuhn wanted. Yet the evidence for classic geometric optics did carry over to wave optics, notwithstanding the fundamental conceptual readjustment that Fresnel's wave theory required. (shrink)

Thomas S. Kuhn's singular voice was stilled by cancer on June 17, 1996, some 49 years after his initial encounters with past science had drawn him into a career in the history and philosophy of science. One of the most widely-read and influential academics of the 20th century, Kuhn was educated at Harvard University, where he received an S.B. in Physics in 1943 and a Ph.D. in the subject in 1949. He remained there until 1956, first as a Junior Fellow (...) in the Society of Fellows from 1948 to 1951, when he in effect retrained himself as a historian of science, and then as an Assistant Professor of General Education and History of Science. He joined the faculty of the University of California, Berkeley, in 1956, becoming Professor of History of Science in 1961. From 1964 to 1979 he was on the faculty of the History of Science Program of Princeton University, and from 1972 to 1979 also a member of the Institute for Advanced Study. He moved to the Department of Linguistics and Philosophy of Massachusetts Institute of Technology in 1979, where he became Professor Emeritus in 1991. He was President of the History of Science Society in 1968—70 and of the Philosophy of Science Association in 1988–90. He received the George Sarton Medal of the History of Science Society in 1982 and the John Desmond Bernal Award of the Society for the Social Studies of Science in 1983. (shrink)

An ethic of care acknowledges the centrality of the role of caring relationships in moral education. Care ethics requires a conception of ?care? that differs from the quotidian use of the word. In order to teach care ethics more effectively, this article discusses four interrelated ways that teachers? understandings of care differ from care ethics: (1) conflating the term of reference ?care? with its quotidian use; (2) overlooking the challenge of developing caring relationships; (3) tending toward monocultural understandings of care; (...) and (4) separating affect and intellect. Awareness of these conceptions of care supports teacher educators to teach care ethics in more meaningful and relevant ways. We explore stories and their dramatization as a medium to facilitate effective and in-depth teaching of care ethics. (shrink)

Reflections on the tradition of Republicanism -- Initial reflections on political philosophy -- Who was Cicero? -- Cicero on the nature of philosophy -- Cicero on cosmology and natural philosophy -- Cicero on natural theology -- Cicero on ethics -- Cicero on oratory and the language arts -- Cicero on politics -- A brief reflection on Nietzsche -- Political philosophy and the Republican future.

The Matthean parable of the labourers in the vineyard is open to multiple interpretations. For some, the parable may speak of God's unlimited grace and generosity; for others the parable may speak of God's unfairness. The present study is set within the context of an emerging interest in the concept of grace as a topic for empirical enquiry. The study draws on the theoretical framework provided by the notion of ordinary theology and employs the sensing, intuition, feeling and thinking (SIFT) (...) approach to biblical hermeneutics, which is rooted in Jungian psychological type theory. Data were drawn from two one-day workshops with Church of England Readers (lay ministers). On each occasion the participants were divided into three separate groups according to their preferences for thinking or feeling (the two judging functions proposed by psychological type theory) and within these groups they were invited to explore the messages about grace in Matthew 20:1-15 (Jesus' parable of the labourers in the vineyard). The rich data gathered from these workshops generated insights into contemporary theologies of grace and also confirmed the hypothesis that a biblical interpretation of grace is shaped by the reader's psychological type preference for thinking or feeling. While feeling types tended to empathise, thinking types pondered motives and unfairness. CONTRIBUTION: Situated within the reader perspective approach to biblical hermeneutics, the SIFT method is concerned with identifying the influence of the psychological type of the reader in shaping the interpretation of sacred text. Employing this method, the present study contributes to three fields of scholarship: to the field of homiletics and hermeneutics, to the field of ordinary theology and to the emerging field concerned with the concept of grace as a topic for empirical enquiry. (shrink)

When Christiaan Huygens prepared the 1686/1687 expedition to the Cape of Good Hope on which his pendulum clocks were to be tested for their usefulness in measuring longitude at sea, he also gave instructions to Thomas Helder to perform experiments with the seconds-pendulum. This was prompted by Jean Richer's 1672 finding that a seconds-pendulum is 1 1/4 lines shorter in Cayenne than in Paris. Unfortunately, Helder died on the voy¬age, and no data from the seconds-pendulum ever reached Huygens. He nevertheless (...) did receive data from his clocks on the return-voyage from the Cape of Good Hope to Texel. When he first calculated the ship's course according to these data, it appeared to have gone straight through Ireland. He then tried introducing a correction to the data, based on an idea he had previously entertained as a possible explanation of Richer's finding: he corrected the observed time to com¬pen¬sate for a reduction in the effect of gravity from the Poles to the Equator resulting purely from the Earth's rotation. His newly calculated course convinced him that this rotational effect is the sole source of any variations in gravity with latitude. This paper examines Huygens's correc¬tions to the data and his reasoning from the new course to the conclusion that nothing else causes a variation in gravity. In the process, we show that Huygens had cogent empirical reasons to reject Isaac Newton's theory of universal gravity, which predicted a some¬what larger variation in gravity. (shrink)

Erving Goffman's distinctive contribution to an understanding of others was grounded in his information control and ritual models of the interaction process. This contribution centered on the forms of the interaction order rather than self-other relations as traditionally conceived in phenomenology. Goffman came to phenomenology as a sympathetic but critical outsider who sought resources for the sociological mining of the interaction order. His engagement with phenomenological thinkers (principally Gustav Ichheiser, Jean-Paul Sartre and Alfred Schutz) has to be understood in these (...) terms. The article traces basic differences in analytical focus through a range of phenomenological critiques of Goffman and a comparison of salient aspects of Schutz's and Goffman's writings. While the contrasts have perhaps been overplayed, I conclude that Goffman's thinking about others probably owed more to his pragmatist roots than to his later encounters with phenomenology. (shrink)

Adopting a much broader notion of thinking than that associated with the Critical Thinking movement, this paper addresses the question of thinking skill generality. An analysis of the concept of ‘thinking skill’ suggests ways in which this notion has been misapplied. The paper demonstrates the importance of thinking tasks and argues for a non–universalistic notion of thinking skill generality. The domains–view of thinking is assessed, evidence from secondary research being used to show that thinking skills are not domain–specific simply by (...) virtue of being instantiated with disciplinary content. The prevalence of general procedural knowledge in our thinking practices notwithstanding, empirical evidence suggests the existence of at least two kinds of domain–specific thinking skills: those in which thinking is essentially the application of domain–specific declarative knowledge; and those addressing specialised, domain–specific, thinking tasks. (shrink)

In this paper we will take a careful look at the well-known fact that a complete 2 rotation in three dimensional space, while leaving vectors, tensors and generally the integral representations of the rotation group unchanged, causes a sign change in the half-integral spinor representations of the rotation group. First, in a brief introduction, we review the origin of the sign change of spinors by a 2 rotation. Next, we analyze Aharonov and Susskind's (hereafter referred to as A. & S.) (...) (1967) original proposal for detecting such a sign change and compare it with a later proposal1 for detecting the sign change using neutron beams that are coherently split and recombined. While the A. & S. experiment is, we think, conceptually more interesting, the neutron beam experiment has actually been carried out. And finally, we discuss the philosophical significance of the rotationally induced spinor sign change. (shrink)

George Boole collected ideas for the improvement of his Mathematical analysis of logic(1847) on interleaved copies of that work. Some of the notes on the interleaves are merely minor changes in explanation. Others amount to considerable extension of method in his mathematical approach to logic. In particular, he developed his technique in solving simultaneous elective equations and handling hypotheticals and elective functions. These notes and extensions provided a source for his later book Laws of thought(1854).