The late eleventh and twelfth centuries were Europe's first age of pamphlet warfare, of invective and satire. The perceived failure, or at least hypocrisy, of its new institutions-the new monastic orders and the reformed papacy-gave rise to the phenomenon, and it was shaped by the study of grammar and rhetoric in the new Schools. The central figures in the texts in the present book are Bernard of Clairvaux, the powerful ostensible founder of the Cistercian order, and the popular and influential (...) teacher Peter Abelard, leader of the radical faction in the Schools of Paris. The event which sparked this controversy was the Church council at Sens in 1141 which had led to the condemnation of Abelard's doctrines. Abelard proposed to use reason to explain the mysteries of faith, and this had led him into all kinds of difficulties with established church doctrine. The leading light in the atttack on his ideas was Bernard, the famous abbot of Clairvaux, a group of whose letters, written to gather support for it before and after the Council, are presented here. A little while later Abelard was defended by the vituperative but otherwise unknown Berengar, who wrote an outrageous Apology attacking Bernard; we also edit his remaining polemical works: his Letter to the Carthusians, and his Letter to the Bishop of Mende. None of Berengar's works has been translated before. An extensive introductory essay describes the course of the debate and the personnel, and analyses the invective employed by both Bernard and Berengar. There is full annotation identifying the writers' sources and clarifying the issues."-- Back cover. (shrink)

This is an exciting time for brain science. Recent progress has been such that it now seems realistic to look toward an explanation of mind in terms of the brain's anatomy and physiology. Models based on artificially symmetrical arrays of idealized neurons are now being superseded by ones which properly take into account the brain's actual circuitry. This book presents a comprehensive overview of the current state of brain modeling, containing contributions from many leading researchers in this field. It will (...) be of interest not only to researchers in the fields of brain science and neurobiology, but also to psychologists and those involved in the study of artificial intelligence. (shrink)

It is suggested that consciousness is primarily associated not with stimuli and perception, as commonly supposed, but with movement and responses. Consciousness of stimuli arises in situations in which possible movements are planned, or in which information must be actively acquired rather than passively registered, and may or may not require overt movements to be performed. By emphasizing response, this formulation provides a simple explanation for the perceived unity of consciousness: though stimuli can be diverse, with independent components, movements must (...) necessarily be coordinated. Therefore, if we are to look for a `site' for consciousness, it is likely to be in a region such as the anterior cingulate that is neurally close to the higher motor hierarchical levels, and also accessible both to real sensory feedback and also to virtual feedback derived through mechanisms of efference copy from actual or proposed motor commands. It is suggested that synchrony of arrival of such information may be an important prerequisite of this unity, and that on this basis such a `master node' might be expected to be temporally `equidistant' from each of these sources; this may well be true of the anterior cingulate, but no doubt also of other structures. (shrink)

The first brief description is given of a project aimed at searching for the neural correlates of consciousness through computer simulation. The underlying model is based on the known circuitry of the mammalian nervous system, the neuronal groups of which are approximated as binary composite units. The simulated nervous system includes just two senses - hearing and touch - and it drives a set of muscles that serve vocalisation, feeding and bladder control. These functions were chosen because of their relevance (...) to the earliest stages of human life, and the simulation has been given the name CyberChild. The system's pain receptors respond to a sufficiently low milk level in the stomach, if there is simultaneously a low level of blood sugar, and also to a full bladder and an unchanged diaper. It is believed that it may be possible to infer the presence of consciousness in the simulation through observations of CyberChild's behaviour, and from the monitoring of its ability to ontogenetically acquire novel reflexes. The author has suggested that this ability is the crucial evolutionary advantage of possessing consciousness. The project is still in its very early stages, and although no suggestion of consciousness has yet emerged, there appears to be no fundamental reason why consciousness could not ultimately develop and be observed. (shrink)

The master-module theory of consciousness is considered in the light of experimental evidence that has emerged since the model was first published. It is found that these new results tend to strengthen the original hypothesis. It is also argued that the master module is involved in generation of the schemata previously postulated to be associated with consciousness . The recent discovery of attention-related activity in the thalamic intralaminar nuclei is taken to indicate that these structures constitute an important part of (...) the feedback loop which the theory conjectured to mediate thought. The theory is shown to lead to a remarkably simple rationalization of the cerebral cortex, and it offers explanations of attention, binocular rivalry and qualia. It also makes the surprising prediction that Broca's area might not exclusively serve speech. (shrink)

It is suggested that the evolutionary advantage of consciousness lies in its mediating the acquisition of novel context-specific reflexes, particularly when the context has temporally varying components. Such acquisition is conjectured to require evaluation of feedback stimuli evoked by the animal's self-paced probing of its environment, or by memories of the outcome of previous such probings, and the evaluation is postulated to be predicated on attention. It is argued that such an approach automatically incorporates sensation into the phenomenon, sensation arising (...) from an interplay between the nervous system and the skeletal musculature, and not from the nervous system alone. This theory avoids the increasingly untenable view that consciousness is part of the normal chain of events linking unprovoked stimuli in the outside world with immediate voluntary reactions to them. The theory should prove attractive to those who might otherwise feel compelled by neurophysiology to embrace epiphenomenalism. It also provides a means of bridging the explanatory gap, and of resolving the celebrated hard problem of consciousness. (shrink)

Recent conjectures regarding the nature and mechanism of consciousness are extended to include the contribution of the cerebellum. The role of this brain structure appears to be a rather sophisticated form of prediction, as exemplified by certain dynamical capabilities of the visual system, and by the difficulty of self-administered tickling. The pars intermedia of the cerebellum is perceived as a direct feedback device, functioning in parallel to the primary neuronal circuit involved in consciousness; this leads to the suggestion that it (...) serves as a tutor for the putative master node, the latter governing the collective movements of all the body's muscles. The cerebellar hemispheres are believed to act as an internal feedback device, and to be more directly coupled to the master node; they are seen as serving plenisentient unconsciousness. The possible importance of muscular spindles for the generation of qualia is discussed, as are the significance of the frontal lobes, the basal ganglia and the limbic system for the content of consciousness. Finally, the stages through which infant consciousness gradually acquires its sophistication are tentatively identified. (shrink)

An easily-accessible introduction is provided for theauthor''s book Enchanted Looms , which is reviewedelsewhere in this volume by Jesse Prinz and by MarcelKinsbourne, and also for the article Didconsciousness evolve from self-paced probing of theenvironment, and not from reflexes? , which alsoappears in this volume and which summarises theauthor''s more recent thoughts on consciousness.

It is suggested that the anatomical structures whichmediate consciousness evolved as decisiveembellishments to a (non-conscious) design strategypresent even in the simplest monocellular organisms.Consciousness is thus not the pinnacle of ahierarchy whose base is the primitive reflex, becausereflexes require a nervous system, which the monocelldoes not possess. By postulating that consciousness isintimately connected to self-paced probing of theenvironment, also prominent in prokaryotic behavior,one can make mammalian neuroanatomy amenable todramatically simple rationalization.

This book delivers much more than its title appears to promise; it is not merely a description of current methods for remotely monitoring brain activity. It primarily concentrates on just one such method: positron emission tomography, but it demonstrates beautifully how far that technique can now take us in the quest to discover the mechanisms underlying thought.

William of Malmesbury's Regesta Regum Anglorum is one of the great histories of England, and one of the most important historical works of the European Middle Ages. Although its focus is national, its scope encompasses most of Western Europe and beyond, providing a full-scale account of the First Crusade. Apart from its formidable learning, it is characterized by narrative skill and entertainment value - with topics including unpowered flight and Henry I's zoo. This edition in the Oxford Medieval Texts series (...) is the first modern translation and edition. A full historical introduction is supplied in Volume II. (shrink)

William of Malmesbury's Regesta Regum Anglorum is one of the great histories of England, and one of the most important historical works of the European Middle Ages. Although its focus is national, its scope encompasses most of Western Europe and beyond, providing a full-scale account of the First Crusade. Apart from its formidable learning, it is characterized by narrative skill and entertainment value - with topics including unpowered flight and Henry I's zoo. This edition in the Oxford Medieval Texts series (...) is the first modern translation and edition. A full historical introduction is supplied in Volume II. (shrink)

We want to build tiny gnat-sized robots, a millimeter or two in diameter. They will be cheap, disposable, totally sefcontained autonomous agents able to do useful things in the world. This paper consists of two parts. The first describes why we want to build them. The second is a technical outline of how to go about it. Gnat robots are going to change the world.

This paper presents an autonomous vision-based obstacle avoidance system. The system consists of three independent vision modules for obstacle detection, each of which is computationally simple and uses a di erent criterion for detection purposes. These criteria are based on brightness gradients, RGB Red, Green, Blue color, and HSV Hue, Saturation, Value color, respectively. Selection of which modules are used to command the robot proceeds exclusively from the outputs of the modules themselves. The system is implemented on a small monocular (...) mobile robot and uses very low resolution images. It has been tested for over 200 hours in diverse environments. Keywords: Vision-based navigation, space exploration, modular design, reactive control, unstructured terrain. (shrink)

We study completely decomposable torsion-free abelian groups of the form $\mathcal{G}_S := \oplus_{n \in S} \mathbb{Q}_{p_n}$ for sets $S \subseteq \omega$. We show that $\mathcal{G}_S$has a decidable copy if and only if S is $\Sigma^0_2$and has a computable copy if and only if S is $\Sigma^0_3$.

We study the complexity of (finitely-valued and transfinitely-valued) Euclidean functions for computable Euclidean domains. We examine both the complexity of the minimal Euclidean function and any Euclidean function. Additionally, we draw some conclusions about the proof-theoretical strength of minimal Euclidean functions in terms of reverse mathematics.

ABSTRACT In establishing National Bioethics Organisations (NBOs), liberal democracies seek to acknowledge the diversity of strongly held ethical positions and the imperative to engage in public debate about important bioethical decisions. NBOs are typically given a range of responsibilities, including contributing to and stimulating public debate; providing expert opinion on relevant issues for policy deliberations; and developing public policy. The state is now found to have an interest in areas previously thought to be a matter of individual choice. NBOs can (...) provide one way of opening up public debate to allow the diversity of views to be heard in a manner that is well‐informed, articulate and responsive to both expert and ‘lay’ public views. We draw on debates in political theory about democratic decision‐making and on the policy making roles of some key NBOs. We are particularly interested in examining the capacity of NBOs to meet the democratic ideal of effective participation by the public, or citizenry, especially by those who are directly affected by the policies, in the development of effective public policy. We provide a basic framework for policy development involving NBOs that can begin to meet this ideal, a process of ‘contested deliberation’. (shrink)

Associative learning is an essential feature of human cognition, accounting for the influence of priming and interference effects on memory recall. Here, we extend our account of associative learning that learns asymmetric item-to-item associations over time via experience by including link maturation to balance associations between longer-term stability while still accounting for short-term variability. This account, combined with an existing account of activation strengthening and decay, predicts both human response times and error rates for the fan effect for both target (...) and foil stimuli. (shrink)

We have previously built a small IKg ([Angle 89] and [Brooks 89]) six legged walking robot named Genghis. It was remarkably successful as a testbed to develop walking and learning algorithms. It encouraged us to build a more fully engineered robot with higher performance. We are building two copies of the robot, both 1.6Kg in mass. Their generic name is Attila. Attila has 24 actuators and over 150 sensors, all connected via a local network (the I2C bus) to 11 onboard (...) computers. (shrink)

Models of risk-taking as used in the social sciences may be improved by including concepts from life history theory, particularly environmental unpredictability and life expectancy. Community college students completed self-report questionnaires measuring these constructs along with several well-known correlates. The frequency of risk-taking was higher for those with higher future unpredictability beliefs and shorter lifespan estimates (as measured by the Future Lifespan Assessment developed for this study), and unpredictability beliefs remained significant after accounting for standard predictors, such as sex and (...) temperament. The results demonstrate the usefulness of applying concepts from life history theory to enhance our understanding of human behavior. (shrink)

Organ donation after a circulatory determination of death is possible in selected patients where consent is given to support donation and the patient has been legally declared dead by two doctors. The National Health Act (61 of 2003) and regulations provide strict controls for the certification of death and the donation of organs and tissues after death. Although the National Health Act expressly recognises that brain death is death, it does not prescribe the medical standards of testing for the determination (...) of brain death (neurological determination of death), circulatory death (circulatory determination of death) or for determination of death based on somatic criteria. However, in all cases of organ donation, including after circulatory death, the National Health Act mandates that two doctors certify the death, with one doctor possessing more than 5 years of experience. Additionally, both doctors must be independent from the transplant team. The standard for such determination, as for brain death, aligns with accepted medical standards. The Critical Care Society of Southern Africa has published South African (SA) Guidelines on Death Determination that outline rigorous standards for death determination in hospital settings by either a neurological or circulatory method. Legislation and the Health Professions Council of SA’s (HPCSA) professional guidance direct clinicians on obtaining informed consent for donation either from the patient or in cases of incapacity from their surrogate decision maker. Collectively, the legislation, regulations and professional guidelines in SA provide a robust ethical framework that supports organ donation after circulatory death. (shrink)

Research is increasingly recognised as a key component of medical curricula, offering a range of benefits including development of skills in evidence-based medicine. The literature indicates that experienced academic supervision or mentoring is important in any research activity and positively influences research output. The aim of this project was to investigate the human research ethics experiences and knowledge of three groups: medical students, and university academic staff and clinicians eligible to supervise medical student research projects; at two Australian universities. Training (...) in research ethics was low amongst academic staff and clinicians eligible to supervise medical student research. Only two-thirds of academic staff and students and less than half of clinicians surveyed indicated that specific patient consent was required for a doctor to include patient medical records within a research publication. There was limited awareness of requirements for participant information and consent forms amongst all groups. In the case of clinical trials, fewer clinicians and students than academics indicated there was a requirement to obtain consent. Awareness of the ethics committee focus on respect was low across all groups. This project has identified significant gaps in human research ethics understanding among medical students, and university academic staff and clinicians. The incorporation of research within medical curricula provides the impetus for medical schools and their institutions to ensure that academic staff and clinicians who are eligible and qualified to supervise students’ research projects are appropriately trained in human research ethics. (shrink)

This second volume contains commentaries on the Latin Aristotle from the University Library, the Fitzwilliam Museum, and the college libraries of the University of Cambridge. This is the second of a projected series of four volumes describing manuscripts and fragments in British libraries containing commentaries on the Latin Aristotle. This volume covers the University Library, the Fitzwilliam Museum, and the college libraries of the University of Cambridge. It lists 152 items , dating from the tenth century until c. 1500. While (...) a few of these manuscripts came to Cambridge after the Reformation, the majority were already in use in the medieval University. Not many have been adequately described before, while most of the anonymous commentaries have not been listed anywhere. Four indexes are provided to facilitate searching the main text. (shrink)