Torque levels, subjective discomfort, and muscle activity associated with four commercially available screwdrivers under static and dynamic work conditions

This study evaluated screwdrivers with different handle designs and blade lengths. 10 men and 10 women voluntarily participated. A repeated-measures experiment design was employed. The three independent factors were sex of user, handle (four types), and blade length (130, 170, and 210 mm). The dependent measures were the maximum supination torque under a static task and the %MVC of EMG responses in biceps brachii and flexor digitorum, and a discomfort rating for the upper extremity under the dynamic task. Analysis showed that the in-line screwdriver with the combined characteristics of large handle diameter (3.8-4.1 cm), smooth rubber covering handle surface, triangular (or circular) shape, and adequate handle length (11 cm) had the greatest supination torque and a smaller discomfort rating than the screwdriver with the pistol-grip handle. Blade length was not significantly related to any dependent measure.     

The Mona Lisa effect: is 'our' Lisa fame or fake?

This demonstration uses one of the most famous human faces, the portrait of Mona Lisa, La Gioconda, by Leonardo da Vinci. Usually, we have a very accurate and stable representation of the exact configuration of such a familiar face. Typically, we are able to rapidly recognise even subtle configural changes. However, here we show that an exposure to specific alterations performed on a familiar face substantially reduces this ability even over a time period as long as 80 min. This demonstration illustrates the flexibility of the perceptual system and adaptation to new information.     

Why do young infants fail to search for hidden objects?

Recent evidence indicates that infants as young as 3.5 months of age understand that objects continue to exist when hidden (Baillargeon, 1987a; Baillargeon & DeVos, 1990). Why, then, do infants fail to search for hidden objects until 7 to 8 months of age? The present experiments tested whether 5.5-month-old infants could distinguish between correct and incorrect search actions performed by an experimenter. In Experiment 1, a toy was placed in front of (possible event) or under (impossible event) a clear cover. Next, a screen was slid in front of the objects, hiding them from view. A hand then reached behind the screen and reappeared holding the toy. The infants looked reliably longer at the impossible than at the possible event, suggesting that they understood that the hand's direct reaching action was sufficient to retrieve the toy when it stood in front of but not under the clear cover. The same results were obtained in a second condition in which a toy was placed in front of (possible event) or behind (impossible event) a barrier. In Experiment 2, a toy was placed under the right (possible event) or the left (impossible event) of two covers. After a screen hid the objects, a hand reached behind the screen's right edge and reappeared first with the right cover and then with the toy. The infants looked reliably longer at the impossible than at the possible event, suggesting that they realized that the hand's sequence of action was sufficient to retrieve the toy when it stood under the right but not the left cover. A control condition supported this interpretation. Together, the results of Experiments 1 and 2 indicate that by 5.5 months of age, infants not only represent hidden objects, but are able to identify the actions necessary to retrieve these objects. The implications of these findings for a problem solving explanation of young infants' failure to retrieve hidden objects are considered.     

On the Conditional Relevance of Controls: An Application of Situational Action Theory to Shoplifting

Classic self-control theory and the pure deterrence argument have both been recently challenged by integrative theory and appropriate empirical evidence suggesting that controls are only conditionally relevant to action. Situational Action Theory (SAT) provides a fertile framework within which to study the effectiveness of controls. Specifically, SAT’s principle of the conditional relevance of controls states that controls only influence behavior when a person is forced to deliberate over action alternatives because of conflict between his/her own moral rules and those of the setting. That the moral filter does not preclude crime from the action alternatives perceived by an individual can be due to weak personal moral norms or exposure to a crime-conducive moral context. In particular, SAT states that (1) deterrence (external control) only becomes relevant to deliberations when personal morality is weak and (2) the process of self-control (internal control) only becomes relevant to deliberations when an individual is exposed to criminogenic moral contexts. Both these hypotheses are tested with a large-scale Austrian student survey dedicated to the explanation of adolescent shoplifting. The results provide firm support for these key propositions of SAT.     

Confluences and differences in the early work of Gurwitsch and Schutz

Conclusion In these highly selective and condensed considerations, I could only offer a comparison of the main sociological themes in Gurwitsch's inaugural dissertation with the corresponding themes in Schutz's first book. Other sociological themes were not discussed, mainly because they were not developed far enough in one or the other or both sources. The crucial theme of explicit and implicit ontological presuppositions had to be ignored because it demands an extensive treatment of its own. The same goes for the proper consideration of the particular conceptions of Husserl mobilized by each author for his purposes.Even so, I hope to have conveyed an idea of the convergences and differences in the early views of Gurwitsch and Schutz, as mirrored in the studies which were compared. This article should be seen as a small beginning of the huge task of studying comprehensively the unique personal and intellectual friendship of two seminal thinkers and the influences they exercised upon each other's work, even though they operated in substantively quite different areas.For pertinent reasons, I have worked from the English translation of Gurwitsch's book under frequent consultation of the German original. By contrast, I relied completely on the original German text of the book by Schutz. Translations from it are my own.For reasons of space-economy, I have refrained from listing all secondary sources. The more important ones of these have been cited by either Gurwitsch or Schutz; the interested reader will have no trouble finding bibliographic information on them in the two books compared.     

The equal division kernel: An equity approach to coalition formation and payoff distribution in N-person games

Most existing models of coalition formation and payoff distribution in groups rest upon normative considerations and are ambiguous in their predictions insofar as they do not determine which of several coalitions will most probably result. The paper sketches the basic features of a model derived from social psychological exchange-and equity-theory which predicts coalitions and payoff distributions for a variety of situations. The evaluation of the model by the results of several experiments indicates that it provides a reasonable starting point for further theoretical developments that are based empirical studies.     

Marxismus und axiologie

Summary Marxist philosophers are increasingly beginning to elaborate a philosophical axiology of their own, to articulate the meaning of socialism in axiological terms. Traditionally, Marxist doctrine has been very eager to present socialism and its motivation as a matter of scientific prediction rather than in terms of value judgments, wishes, or the proclamation of ideals. A more accurate analysis, however, shows that the Marxist undertanding of human social practice presupposes some active striving in relation to which all objects and circumstances of human life receive a positive or negative meaning. It is just this practical relation of human subjects to their world (and of their world to them) that is conceptually grasped by the notion of value.From the theoretical point of view, Marxist axiology is not oriented towards some realm of values all values and value relations are understood strictly in anthropological terms as components of human and social practice, as some particular aspects which objects and circumstances assume in relation to actively striving beings and their qualitatively determined self-affirmation on a definite historical level. Marxist axiology presents itself both as a theoretical analysis of these value qualities and relations, and at the same time as a doctrine of practical involvement whose aim is to clarify and strengthen the socialist value consciousness.The basis of all these value relations lies in the system of human needs. According to Marxism, this system proves to be multi-dimensional, encompassing as its fundament the complex of material needs which are to be satisfied through work. But equally important and urgent for human beings are those needs and requirements in relation to which all social relations are characterized as being worthy or unworthy of man (such judgments being in accordance with some historical standard of claims). Finally, there are also those peculiar needs basic to the aesthetic qualities of objects as well as to the free (not imposed by natural or social necessities) and purposeless activities of human play and self-realization. The desideratum of socialism is to bring about a harmoniously proportioned synthesis in the satisfaction of the totality of human needs for the totality of human beings. Socialism is not only necessary and predictable in a scientific sense but also valuable and desirable for people.Several Marxist (and especially Soviet) authors have worked out the outlines of a Marxist philosophical axiology (V. P. Tugarinov, O. M. Bakuradze, V. A. Vasilenko and others). The opponents of such an enterprise (O. G. Drobnickij and others) have more or less radically contested the value and legitimacy of such a theory of value, for they consider value consciousness as a part of a pre-scientific way of thought. On the theoretical level the abstract specification of such value relationships constitute an artificial separation of the theoretical-practical unity and totality of human relations to the world.The author finds these objections not convincing because the danger of hypostatizing and isolating the values, of presenting them as some kind of substantial eternal entities, can fully be overcome by anthropological integration and sociological concretization of the value aspect. In a Marxist philosophy of practice something is not valuable in itself but is either positively or negatively significant for human beings. Certainly this development of axiology in Marxism is an attempt to set up a counterweight to the traditional scientific objectivism of the Marxist doctrine by confirming the right of people to judge and act subjectively on certain issues.

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Professor V. P. Tugarinov, Leningrad, zum 70. Geburtstag.