Arrows,Balls and the Metaphysics of Motion

The arrow paradox is an argument purported to show that objects do not really move. The two main metaphysics of motion, the At–At theory of motion and velocity primitivism, solve the paradox differently. It is argued that neither solution is completely satisfactory. In particular it is contended that there are no decisive arguments in favor of the claim that velocity as it is constructed in the At–At theory is a truly instantaneous property, which is a crucial assumption to solve the paradox. If so the At–At theory faces the threat that most of our physical theories turn out to be non-Markovian. Finally it is considered whether all those threats and paradoxes are dispelled if only a new metaphysics of persistence is taken into account, namely four-dimensionalism.     

Reversing Arrows in Mediation Models Does Not Distinguish Plausible Models

Reversing arrows in the classic tri-variate X-M-Y mediation models as a test to check whether one mediation model is superior to another is inadmissible. Presenting evidence that one tri-variate mediation model yields a significant indirect effect, whereas one with some reversed arrows does not, is not proof or even evidence that one model should be preferred. In fact, the significance of the indirect or any other effect can never be used to infer whether one model should be preferred over another, if the models are in the same so-called equivalence class. The practice of running several mediation models with reversed arrows to decide which model to prefer should be abandoned. The only way to choose among equivalent models is through assumptions that are either fulfilled by design features or invoked based on theory. Similar arguments about reversing arrows in mediation models have been made before, but this current work is the first to derive this result analytically for the complete (Markovian) equivalence class of the tri-variate mediation model.     

Arrows of time in infancy: the representation of temporal-causal invariances

Many transformations that take place over time can only occur in one temporal direction, and adults are highly sensitive to the differences between forward and backward presentations of such events. In seven experiments using two selective-looking paradigms, 4- and 8-month-olds were shown forward and backward videotapes of events involving the effects of gravity on liquids and solid objects and of the separation of whole objects into pieces. Four-month-olds showed a significant preference for the forward version of liquid pouring from a beaker to a glass. Eight-month-olds looked longer at the forward versions of this and four other gravity-related events but showed no directional preferences for the separation events. Several experiments indicate that longer looking at the forward versions of the gravity stimuli is not a product of attraction to specific perceptual features of the stimuli. A model based on the development of representations of types of events is presented and evaluated.     

从"箕子明夷"到"听其有矢"——对《周易》"明夷"的法文化解读

"明"即辨别、验证,"夷"即弓矢的合文,表示弓、矢上面的符号一致."明夷"即"验证弓矢".弓矢是东夷民族发明的工具和武器.弓矢是论功行赏论罪行罚和确认战利品归属的重要凭据,也是确定猎获物所有权和损害赔偿责任的重要依据.古."(渡)"字中的"去"由弓矢二字构成,表示弓、矢上面的符号不一致."明夷"与《洪范》九畴之"明用稽疑"之间具有内在联系,"明夷"或即"明疑."这种方法由于曾经被殷末箕子所提倡或坚持而与其名字联在一起.西周金文"(渡)"字的产生与"明夷"制度有关."(渡)"字标志着古代法律由神判法(独角兽扁)向人判法(重视证据)的过渡.     

Portable Myoelectric Brace Use Increases Upper Extremity Recovery and Participation But Does Not Impact Kinematics in Chronic,Poststroke Hemiparesis

The authors examined the efficacy of an 8-week regimen combining repetitive task-specific practice (RTP) with a myoelectric brace (RTP+Myomo) on paretic upper extremity (UE; use in valued activities, perceived recovery, and reaching kinematics) in 12 subjects (4 men; M age = 53.5 years; mean time poststroke = 61.7 months). Seven subjects were administered RTP+Myomo therapy, and 5 were administered RTP only. Both groups participated in individualized, 45-min therapy sessions occurring 3 days/week over an 8-week period. The arm, hand ability, activities of daily living, and perceptions of recovery subscales of the Stroke Impact Scale (SIS), as well as UE reaching kinematics, assessed before and after the intervention. Subjects in the RTP+Myomo group showed greater improvements on all SIS subscales, with the recovery scale reaching statistical significance (p = .03). Subjects in the RTP-only group showed a greater increase in hand velocity in the reach up task (p = .02), but no changes were observed in the range of shoulder flexion or elbow extension during reaching. None of the changes in kinematic outcome measures significantly correlated with any of the changes in SIS subscales. RTP integrating myoelectric bracing may be more beneficial than RTP only in improving self-reported function and perceptions of overall recovery. The authors observed no changes in the range of elbow extension, and no relationship between self-reported improvements and changes in reaching kinematics.     

The Perceived Value of Small Coins

Abstract

This study was concerned with the picking up of small coins as an unobtrusive measure of their perceived worth. Five sets of the four least valuable British coins were placed (“lost”) in a country town. Five pairs of observers noted the approximate age and sex of those 100 passersby who, having seen the coin, either did or did not pick it up. The results showed that the probability of a person picking up and keeping a “lost” coin increased linearly with its worth.     

Psychometric Models of Small Group Collaborations

The social combination theory of group problem solving is used to extend existing psychometric models to collaborative settings. A model for pairwise group work is proposed, the implications of the model for assessment design are considered, and its estimation is addressed. The results are illustrated with an empirical example in which dyads work together on a twelfth-grade level mathematics assessment. In conclusion, attention is given to avenues of research that seem most fruitful for advancing current initiatives concerning the assessment of collaboration, teamwork, and related constructs.     

Small wonders of the Indian market

Heavy competition in India in almost all product categories, due to diversification by large and medium companies and increased entry of multinationals, has restricted the growth of domestic companies. Previously, large companies enjoyed high profit margins by targeting premium priced products in the upper strata of Indian society. High levels of competition from equally reputed brands have not only decreased the companies' market share but also created price wars, reducing profit margins and limiting market growth. This has motivated companies to consider the lower classes and the rural segments, which they had previously ignored. By targeting these segments with products in small packs at lower price points, companies have experienced great success. At the same time, small packs also pose some challenges for the companies. This paper explains the importance of small packs for market expansion in various product categories within the Indian market, drawing on several examples to support the views of the authors. Copyright © 2004 Henry Stewart Publications.     

Psychotherapy of Schizophrenics in Small Groups

Abstract

I describe aspects of a multimodal presentation sponsored by a professional organization of group psychotherapists, entailing lecture and discussion, a small demonstration or fishbowl group, and a large group experience. As the invited presenter, I was being counted on to attract attendees, to stimulate and maintain their interest, and to draw enthusiasm to the host organization and its future conferences. This required, in short order, promoting cohesion, establishing norms, and creating a safe enough culture to embrace challenge, to take risks, to learn, and to seek help. Events occurring in both the larger and smaller groups were to be utilized for the benefit of the individuals and the groups themselves, to make the experience interesting and sufficiently compelling, to teach the basic principles promised by the conference’s theme, and to demonstrate technique. Dysfunction or negative consequences were to be avoided. My mode of leadership was perceived by some as positive if not outrageous, but for others it just provoked outrage. Perhaps such reactions are to be expected whenever a leader challenges a group to experience and think in new ways. I tried to utilize the ensuring controversy to illustrate the conference’s topic: loving, hating, and curiosity—group processes of resistance, rebellion, and refusal.