To controlforceaccurately under a wide range of behavioral conditions, the central nervous system would either require a detailed, continuously updated representation of the state of each muscle (and the load against which each is acting) or else force feedback with sufficient gain to cope with variations in the properties of the muscles and loads. The evidence for force feedback with adequate gain or for an appropriate central representation is not sufficient to conclude that force is the major controlled variable in (...) normal limb movements.Morton's hypothesis, thatlengthis controlled by a follow-up servo, has a number of difficulties related to the delays, gains, variability, and specificity in feedback pathways comprising potential servo loops. However, experimental evidence is consistent with these pathways providing servo assistance for some movements produced by coactivation of α- and static γ-motoneurons. Dynamic γ-motoneurons may provide an additional input for adaptive control of different types of movements.The idea that feedback is used to compensate for changes in musclestiffnesshas received experimental support under static postural conditions. However, reflexes tend to increase rather than decrease the range of variation in muscle stiffness during some cyclic movements. Theoretical problems associated with the regulation of stiffness are also discussed. The possibilities of separate control systems forvelocityorviscosityare considered, but the evidence is either negative or lacking. I conclude that different physical variables can be controlled depending on the type of limb movement required. The concept of stiffness regulation is also useful under some conditions, but should probably be extended to the regulation of the visco-elastic properties (i.e., the mechanical impedance) of a muscle or joint. (shrink)

There is growing interest in clinical ethics. However, we still have sparse knowledge about what is actually going on in the everyday practice of clinical ethics consultations. This paper introduces a descriptive evaluation tool to present, discuss and compare how clinical ethics case consultations are actually carried out. The tool does not aim to define ‘best practice’. Rather, it facilitates concrete comparisons and evaluative discussions of the role, function, procedures and ideals inherent in clinical ethics case consultation practices. The tool (...) was developed during meetings of the European Clinical Ethics Network. Based on written reports and participation in the network meetings, the development and the content of the tool and the results of its application in presenting and discussing 10 case consultations are summarized. The tool facilitated understanding of the details of clinical ethics case consultations across individuals and institutions with various experiences and cultures, and comparison between various practices. (shrink)

One area in which the moral philosopher might say something useful for the thinking of economists is that of welfare economics – not by improving formalizations or criticizing proofs as to conditions necessary or sufficient for an optimum situation, much less by suggesting what particular state of society would be optimal. Rather, he can do this by pointing out some distinctions, by suggesting how some terms used by economists can profitably be defined, and by questioning some assumptions which seem to (...) lie behind the thinking of some economists. The following discussion is aimed along these lines. The main goal of the argument will be to produce helpful definitions of “increase the welfare of an individual” and “increase social welfare.”. (shrink)

E.R. Dodds’ 1959 edition of Plato’s Gorgias is a conventional treatment of this dialogue, aimed at audiences interested in close study of the text. Dodds himself regretted this outcome. He felt he had lost sight of an earlier goal, formulated at a time of political turmoil on the eve of WorldWar II, of using the Gorgias to bring out ‘both the resemblance and the difference between Plato’s situation and that of the intellectual today’. The present paper attempts to reconstruct that (...) goal, as it survives residually in his edition, surfaces in his The Greeks and the Irrational, and appears in some writings from the 1930s, particularly in unpublished lectures. Dodds did frequently juxtapose ancient and modern conceptions of the intellectual, and in a way that cast Plato in a positive light, as someone politically engaged and self-critical, and acutely sensitive, as Dodds himself was, to the political implications of social psychology. (shrink)

In their 2008 paper, Persson and Savulescu suggest that for moral bioenhancement (MBE) to be effective at eliminating the danger of ‘ultimate harm’ the intervention would need to be compulsory. This is because those most in need of MBE would be least likely to undergo the intervention voluntarily. By drawing on concepts and theories from epidemiology, this paper will suggest that MBE may not need to be universal and compulsory to be effective at significantly improving the collective moral standing of (...) a human populace and reducing the threat of ultimate harm. It will identify similarities between the mechanisms that allow biological contagions (such as a virus) and behaviours (such as those concerned with ethical and unethical actions) to develop, spread, and be reinforced within a population. It will then go onto suggest that, just as with the epidemiological principle of herd immunity, if enough people underwent MBE to reach a minimum threshold then the incidence and spread of immoral behaviours could be significantly reduced, even in those who have not received MBE. (shrink)

It is the aim of this paper to examine certain aspects of a point of view which has attracted much attention in physical methodology. This is the standpoint known as operationalism. We wish to discuss its significance in the construction and interpretation of physical theories.The essential meaning of operationalism in physics is that physical concepts should be defined in terms of actual physical operations. On this view there is no meaning to a concept unless it represents an operation which can (...) be performed in the laboratory. Thus the term “pressure of a gas” signifies nothing until an operation is described which constitutes the measurement of pressure. When one thinks of pressure one must think. of some actual apparatus, such as, for example, some glass and rubber tubing and some mercury and certain operations performed using these until finally one gets a pointer reading which one calls the pressure of the gas. The same stand is taken with respect to length, time, velocity, acceleration, temperature, etc. (shrink)

K.J. Devlin has extended Jensen's construction of a model ofZFC andCH without Souslin trees to a model without Kurepa trees either. We modify the construction again to obtain a model with these properties, but in addition, without Kurepa trees inccc-generic extensions. We use a partially defined ◊-sequence, given by a fine structure lemma. We also show that the usual collapse ofκ Mahlo toω 2 will give a model without Kurepa trees not only in the model itself, but also inccc-extensions.

There has been much discussion about how to obtain legitimacy at macro-level priority setting in health care by use of fair procedures, but how should we consider priority setting by individual clinicians or health workers at the micro-level? Despite the fact that just health care totally hinges upon their decisions, surprisingly little attention seems being paid to the legitimacy of these decisions. This paper addresses the following question: what are the conditions that have to be met in order to ensure (...) that individual claims on health care are well aligned with an overall concept of just health care? Drawing upon a distinction between individual and aggregated needs, I argue that even though we assume the legitimacy of macro-level guidelines, this legitimacy is not directly transferable to decisions at micro-level simply by adherence to the guidelines’ recommendation. Further, I argue that individual claims are subject to the formal principle of equality and the demands of vertical and horizontal equity in a way that gives context- and patient-related equity concerns precedence over equity concerns captured at the macro-level. I conclude that if we aim to achieve just health care, we need to develop a complementary framework for legitimising individual judgment of patients’ claims on health care resources. Moreover, I suggest the basic structure of such a framework. (shrink)

This study examines whether scenic beauty judgments based upon photographs of landscapes are similar to scenic beauty judgments based upon on-site experiences of landscapes. Two concerns are emphasized: a concern about the threat to the ecological validity of photo-based assessments caused by differences between on-site and photo-based contexts and a concern that the individual rater, rather than the group average, is the more appropriate unit of analysis for tests of validity of photo-based assessments. On-site scenic beauty assessments were collected from (...) day hikers. These data were compared to photo-based scenic beauty assessments collected from the same persons three months and nine months after their on-site experience. Approximately 38% of participants had insignificant correlations between their on-site and photo-based scenic beauty ratings. These and other results suggest that the validity of photo-based scenic beauty assessments is in doubt, at least for the situation studied here. Moreover, the results suggest that the difference between persons' on-site and photo-based ratings can be explained, in part, by contextual factors such as the mood, meaning, and novelty that differentiate photo-based from on-site landscape experiences. Group averaged on-site and photo-based assessments, however, were very similar, suggesting caution may be in order for studies interpreting summary measures. (shrink)

The modern theoretical physicist is a strange creature. Perhaps in every age the theoretical physicist has seemed so to his contemporaries who took the trouble to observe and think about him. There seems, for example, something almost too magical in the uncanny way in which he pulls a brand new atomic particle out of a theory, a way that reminds us of a rabbit being produced out of a hat. This is usually done in an off-hand manner with a considerable (...) amount of patter of a highly abstract symbolic character but with a few words inserted in the right places for the benefit of the experimental physicist and a final prediction that if the experimenter does thus and so in the laboratory he will find a certain result. No wonder the observer marvels when the answer comes out right. But as he thinks further he is inclined to wonder whether it is necessary or desirable for the details of the process which led to the result to be so unintelligible. For unintelligible they seem to be to a great many people who are directly concerned with their understanding, to the people who for years have been laboring under the belief that they are engaged in the task of finding out how Nature works. What is this curious process whose whole task, according to one distinguished exponent of it, is merely to predict experimental results, and what is its future likely to be? These are the questions we are setting for ourselves in the present discussion. It is unlikely that the answers given here will satisfy everybody, but it is reasonably certain that nobody who aspires to an interest in science can fail to attach some meaning to them whether or not he agrees. (shrink)

In order to explain the idea that sacrifice involves voluntary diminution of the agent’s well-being, “well-being” must be explained. The thesis that an agent’s well-being just consists in the occurrence of events wanted is rejected. Overvold replaces it by the view that the motivating desires involve the existence of the agent, alive, at the time of their satisfaction. This view seems counterintuitive. The whole desire-satisfaction theory is to be rejected partly because we dont’t think an event worthwile if it is (...) not liked when it occurs, and partly because the theory cannot give a sensible account of what is good for an individual when his desires change. A more satisfactory view is that the goodness of an event for a person is fixed by his total gratifications as a result of its occurrence, provided they would occur if the person were fully informed about facts knowledge of which would change them if it existed. But self-sacrifice seems to involve not only voluntary diminution of well-being in this sense, but belief that the action is taken for the benefit of someone else. Overvold’s view leaves open the possibility that acting morally is never contrary to self-interest, if one of the agent’s major interests is that he act morally. This is an ingenious suggestion, but seems a bit counterintuitive. (shrink)