Visual Feedback and Positioning Movements

Subjects (n = 60) performed both the reproduction and learning of a linear positioning movement under one of five visual feedback conditions. Results from two experiments indicated that visual cues from the task display augmented information available from visual feedback of the movement per se. Extraneous cues from the task display have clearly confounded the manipulation of visual feedback in previous positioning studies. When these cues are eliminated, visual distance information seems more useful than visual location information.     

A Test of the Schema Theory of Discrete Motor Learning

The recall schema in a response class of discrete movements was investigated, with variability of practice being manipulated before transfer to a new instance in the response class. After the transfer, the varied-practice group performance was superior to the continuous practice group. The interaction of the low-and high-variability groups from training to recall performance supported the prediction that a group with more variable training would exhibit an increased rate of learning when introduced to a new instance of the response class. After two days, the superiority of the high-variability group over the low disappeared, suggesting the memory representations of the two groups were no different under withdrawal of knowledge of results.     

Characteristics of Unintentional Movements by a Multijoint Effector

The authors explored the phenomenon of unintentional changes in the equilibrium state of a multijoint effector produced by transient changes in the external force. The subjects performed a position-holding task against a constant force produced by a robot and were instructed not to intervene voluntarily with movements produced by changes in the robot force. The robot produced a smooth force increase leading to a hand movement, followed by a dwell time. Then, the force dropped to its initial value leading to hand movement toward the initial position, but the hand stopped short of the initial position. The undershoot magnitude increased linearly with the peak hand displacement and exponentially with dwell time (time constant of about 1 s). For long dwell times, the hand stopped at about half the total distance to the initial position. The authors interpret the results as consequences of a drift of the referent hand coordinate. Our results provide support for back-coupling between the referent and actual body configurations during multijoint actions and produce the first quantitative analysis of this phenomenon. This mechanism can also explain the phenomena of slacking and force drop after turning visual feedback off during accurate force production task.     

Political Violence in Northern Ireland

This study examined political violence, focusing on paramilitary activity in Northern Ireland, particularly that of the Provisional Irish Republican Army (IRA). The study argued that the parameters of such behavior are similar in some important respects for all conflict-oriented groups, whether national armed forces or paramilitary organizations. The motivation, personal characteristics, and proximate situational influences involved in the violence in Northern Ireland are considered. The analysis draws on concepts and research from social psychology and attempts to construct a tentative psychological framework to facilitate an understanding of political violence in general.     

Predictors of Irrational Thinking in Regular Slot Machine Gamblers

Previous research has suggested that irrational thinking may play a central role in the maintenance of behavior in slot machine gambling (M. B. Walker, 1992b). The present study is an evaluation of the validity and predictors of irrational thinking in a sample of regular gamblers (N = 20) drawn from the general community. The results were generally consistent with earlier findings; 75% of gambling-related cognitions were found to be irrational. Irrationality was unrelated to the amount of money lost or won during sessions but was positively related to risk taking. The most common irrational cognitions included false beliefs concerning the extent to which outcomes could be controlled or predicted and the attribution of human qualities (personification) to gambling devices. Gender comparisons showed that women were more likely than men to personify the machines. The validity of the speaking-aloud approach and suggestions for future research are discussed.     

Another view of “we”: Majority and minority group perspectives on a common ingroup identity

Drawing on the evidence of the role of social categorisation and identity in the development and maintenance of intergroup biases, research on the Common Ingroup Identity Model (Gaertner & Dovidio, 2000 Gaertner, S. L. and Dovidio, J. F. 2000. Reducing intergroup bias: The Common Ingroup Identity Model, Philadelphia, PA: The Psychology Press.  [Google Scholar]) has investigated how modifying the ways that the self and others are categorised can reduce prejudice and discrimination. In this article, we review more recent research that extends our initial formulation of the model by considering more fully alternative forms of recategorisation (a dual identity as well as a one-group representation), the different preferences of majority and minority groups for these different forms of recategorised representations, and the potential implications of these different preferences on the content of intergroup interaction and on the possibilities for social change towards equality.     

Indecent Medicine: In Defense of the Absolute Prohibition against Physician Participation in Torture

In a recent article, Gross (2004) Gross, M. 2004. Doctors in the decent society: Torture, ill-treatment, and civic duty. Bioethics, 18(2): 181–203. [INFOTRIEVE][CSA][CROSSREF] [Google Scholar] argues that physicians in decent societies have a civic duty to aid in the torturing of suspected terrorists during emergency conditions. The argument presupposes a communitarian society in which considerations of common good override questions of individual rights, but it is also utilitarian. In the event that there is a ticking bomb and no other alternative available for defusing it, torture must be used, and physicians must play their part. In an earlier article, Jones (1980) Jones, G. 1980. On the permissibility of torture. Journal of Medical Ethics, 6: 11–13. [INFOTRIEVE][CSA] [Google Scholar] also argues in favour of physician participation in torture, going so far as to enthusiastically endorse the allocation of research resources as well to ensure that the ability to meet emergency situations is as efficient as scientifically possible. I argue against both these views and defend the absolute prohibition against torture generally, and against any participation by physicians in particular. I show that these arguments are incompatible with liberal or decent societies, and that the institutional requirements for making torture effective would constitute an unacceptable degradation both of medical ethics and practice, as well as of political institutions in general.     

C1调制效应的理论评述及影响因素

C1成分是对视觉刺激最早做出反应的视皮层诱发电位,C1调制效应是指注意等因素能够影响C1振幅的现象.以往多数研究未观察到注意等因素对C1振幅的影响,仅发现注意等因素对晚于C1的P1与N1等成分存在调制作用,并有研究者据此提出延迟反馈假说.但近期研究提示,注意等因素可能会对C1成分产生影响,提示初级视皮层(V1)可能在视觉信息加工初期直接受注意调制.目前,对C1调制效应的影响因素尚未完全确定,知觉学习、负载等因素的作用尚待考察.未来研究需进一步明确C1调制效应的影响因素及实验条件.     

When a product takes on characteristics of the person who created it: Sometimes it sounds sweeter

We investigated when consumers' judgments about a product reflect information about its product source (the person who creates the product). Three experiments manipulated congruence between the source's gender and the gender-typing of the source's product. When congruent with expectations (a male conductor played male-typed music), pre-trial source information had the same effect on post-trial product judgments as when source information was absent. Incongruence (a female conductor played male-typed music) distorted product attribute judgments when the source's competence was questioned. Her music was judged to be more delicate, less powerful and worse quality than his. This process of product experience being assimilated into incompetence stereotypes required minimal cognitive resources. When the incongruent source was undoubtedly competent, the amount of experiential evidence about an attribute influenced distortion. Consumers judged powerful music as powerful regardless of conductor gender, but, lacking much evidence about its delicacy, judged hers as more delicate than his. The selective effect of source gender information reflects consumers' cognitively effortful hypothesis testing of beliefs that gender expresses itself in a person's output against experiential evidence.     

Religiosity and fear of death: a three‐nation comparison

Numerous studies have sought to determine if religiosity is correlated with fear of death. Findings have been anything but consistent, with reports of negative relationships, positive relationships, no relationship, and even curvilinear associations. To shed light on this still contentious issue, the present study was undertaken among college students in three countries – Malaysia, Turkey, and the United States. Overall, the patterns in all three countries were similar. When linearity was assumed, there is a substantial positive correlation between most religiosity measures and fear of death. Assuming curvilinearity added slightly to the strength of the relationships in the US data and nothing to data from Malaysia or Turkey. Other findings were that on average females were more religious and feared death more than did males, and Muslims expressed considerably greater fear than did members of any other major religion. Results were discussed in the context of a new theory – called death apprehension theory. Among other things, it specifically predicts that death apprehension will be positively related to most religious beliefs and practices.