Interlimb coordination: Learning and transfer under different feedback conditions

The role of intrinsic and extrinsic information feedback in learning a new bimanual coordination pattern was investigated. The pattern required continuous flexion-extension movements of the upper limbs with a 90 ° phase offset. Separate groups practiced the task under one of the following visual feedback conditions: (a) blindfolded (reduced FB group), (b) with normal vision (normal FB group), or (c) with concurrent relative motion information (enhanced FB group). All groups were subjected to three different transfer test conditions at regular intervals during practice. These tests included reduced, normal vision, and enhanced vision conditions. Experiment 1 showed that the group receiving augmented information feedback about its relative motions in real-time produced the required coordination pattern more successfully than the remaining two groups, irrespective of the transfer conditions under which performance was evaluated. Experiment 2 replicated and extended the superiority of the enhanced feedback group during acquisition and retention. Experiment 3 demonstrated that successful transfer to various transfer test conditions was not a result of test-trial effects. Overall, the data suggest that the conditions that optimized performance of the coordination pattern during acquisition also optimized transfer performance.     

The Effects on Layoff Survivors of Their Fellow Survivors' Reactions1

A multimethod series of studies examined factors that moderate the effects on layoff survivors of their fellow survivors' reactions. Studies 1 and 2 showed that survivors' work performance was more influenced by the reactions of fellow survivors who were relatively attractive. Study 3 revealed that survivors' work performance and turnover intention were more positively related to the reactions of relatively attractive fellow survivors, but only when the survivors had relatively little communication with their fellow survivors about the layoff; among those who communicated a great deal with fellow survivors about the layoff, work performance, and turnover intention were positively related to their fellow survivors' reactions, regardless of the attractiveness of their fellow survivors. The discussion focuses on theoretical and practical implications, limitations of the studies, and areas for further research.     

On Hodgkin and Huxley's theory of excitable membranes

Using Sneed's metatheory an attempt is made to reconstruct Hodgkin and Huxley's theory of excitation of cell membranes. The structure of this theory is uncovered by defining set-theoretical predicates for the partial potential models, potential models, and models of the theory. The function of permeability is said to be the only theoretical function with respect to this theory. The main underlying assumptions of the theory are briefly outlined.     

Are Animals Capable of Concepts?

Often, the behavior of animals can be better explained and predicted, it seems, if we ascribe the capacity to have beliefs, intentions, and concepts to them. Whether we really can do so, however, is a debated issue. Particularly, Donald Davidson maintains that there is no basis in fact for ascribing propositional attitudes or concepts to animals. I will consider his and rival views, such as Colin Allen's three-part approach, for determining whether animals possess concepts. To avoid pure theoretical debate, however, I will test these criteria using characteristic examples from ethology that depict a broad range of animal behavior. This will allow us to detect a series of gradations in animals' capacities, in the course of which we can think over what would count for or against an attribution of concepts and propositional attitudes to them in each single case. Self-conceit is our natural hereditary disease. Of all creatures man is the most wretched and fragile, and at once the most supercilious. ... It is by this conceit that man arrogates to himself ... divine properties, that he segregates himself from the mass of other creatures and raises himself above them ... (de Montaigne) This revised version was published online in July 2006 with corrections to the Cover Date.     

Beliefs in Conspiracies

This study used canonical correlation to examine the relationship of 11 individual difference variables to two measures of beliefs in conspiracies. Undergraduates were administered a questionnaire that included these two measures (beliefs in specific conspiracies and attitudes toward the existence of conspiracies) and scales assessing the 11 variables. High levels of anomie, authoritarianism, and powerlessness, along with a low level of self-esteem, were related to beliefs in specific conspiracies, whereas high levels of external locus of control and hostility, along with a low level of trust, were related to attitudes toward the existence of conspiracies in general. These findings support the idea that beliefs in conspiracies are related to feelings of alienation, powerlessness, hostility, and being disadvantaged. There was no support for the idea that people believe in conspiracies because they provide simplified explanations of complex events.     

Intergroup Interaction and Self-Disclosure1

Two studies were designed to test hypotheses concerning self-disclosure during initial interactions with ingroup or outgroup strangers. Based on intergroup anxiety theory it was predicted that ingroup members would disclose less to outgroup strangers than to ingroup strangers. One study involved interaction with handicapped and nonhandicapped confederates and one involved interaction with Caucasian and Black confederates. It was found that on some dimensions there was less self-disclosure to outgroup than ingroup strangers during initial interactions. Additional data suggested that high levels of public self-awareness and perceived dissimilarity also reduced some aspects of self-disclosure.     

Sex differences in attributions for the performance of women of a masculine task

Sex differences in the attributions of observers for the successful or unsuccessful behavior of a female actor performing a masculine task were studied. For the perceived causes of the outcome it was found that internal attributions were emphasized more for success than for failure. In addition, female observers attributed both types of outcome more to effort than did males. The nature of the outcome and the sex of the observer also affected the perceived personality traits of the actor. More positive traits were attributed to the successful than to the unsuccessful actor. The female observers attributed more instrumental traits to the actor than did the male observers. The results were discussed in terms of Jones and Davis's theory (1965) of correspondent inferences and the fact that competence was not viewed as being incompatible with femininity.