Using attribute trade‐off information in investment

The paper describes use of trade‐off information to create effective stock portfolio characterized by desired values of selected stock attributes. Basic notions behind such portfolio creation processes are discussed and related to the multiattribute analysis performed by evaluating compensations among the attributes’ values. A framework to construct a portfolio using only compensatory information is presented and applied to the analysis of the stocks traded on the Toronto Stock Exchange. Copyright © 1999 John Wiley & Sons, Ltd.     

A non-linear utility theory with multiple objectives

The aim of this paper is to make optimum several objectives at the same time which would enable a measurement of utility for several possible alternatives. The problem is solved if a strong or weak dominance exists between the alternatives, otherwise a set of incomparable alternatives would be present. Therefore, indifference curve analysis offers the outcome but as these indifference loci are difficult to determine only the characteristics of this analysis are maintained viz. decreasing marginal utility, non-linearity and even non-convexity. Indifference and reference point theory with the Minkowski min–max-metric only respond to these characteristics. Also the problem of generating alternatives during the process is taken into consideration. © 1998 John Wiley & Sons, Ltd.     

Attack and defense in conspecific fighting in tree shrews (Tupaia belangeri)

Principles of conspecific defense have been analyzed for rodents, in which specific target sites for biting by attackers on defenders serve as an important determinant of the actions involved in both attacker and defender behavior. In an effort to determine the generality of these principles, attack and defensive behaviors and target sites for biting attack were evaluated in a nonrodent species, the tree shrew (Tupaia belangeri). Brief daily and repeated conspecific dyadic encounters between adult, socially experienced males (dominants, attackers), and adult, socially naive males (subordinates, defenders) that had been transferred into the territory of the dominants, produced a polarization of attack and defense. The dominant males showed chase, chase attack, jump attack, and biting behaviors, while the subordinates displayed flight and freezing. The vast majority of bites, as well as wounds and bruises, were on the subordinates’ backs. These patterns are very similar to those previously found in rats and mice and suggest that the organization of fighting, with targets of biting (or other painful) attack serving as an important determinant of both attacker (dominant) and defender (subordinate) behavior, may show considerable generality across nonrodent as well as rodent species. Although relatively few wounds were found after 28 days of repeated and daily encounters, the subordinate tree shrews show a variety of behavioral, neuroendocrine, and central nervous changes, indicating that they are stressed by these encounters per se. Aggr. Behav. 27:139–148, 2001. © 2001 Wiley‐Liss, Inc.     

The Common Beliefs Survey-III, The Situational Self-Statement, and Affective State Inventory and Their Relationship to Authoritarianism and Social Dominance Orientation

The concept of irrational beliefs is central to rational emotive behavior therapy (REBT). These beliefs are defined by their absolutist and dogmatic qualities. The terms absolutist and dogmatic are also characteristic of some personality constructs, right-wing authoritarianism (RWA) being foremost among these. A relatively new personality construct, social dominance orientation (SDO) is similar to RWA in that both are excellent predictors of prejudice. As these two constructs are independent of each other, it has been suggested that they have different etiological underpinnings. The present study examined the relationship between the presence of irrational beliefs in people scoring high in RWA and SDO. Results suggest that high RWAs are more likely than high SDOs to endorse irrational beliefs. These findings add to the growing literature examining the relationship between these two personality constructs as well as suggesting possible implications for the use of REBT with clients scoring high on these personality dimensions.     

Dominance and age-related changes in the play fighting of intact and post-weaning castrated male rats (Rattus norvegicus)

The play fighting behaviour of male rats (Rattus norvegicus) castrated at weaning was compared to that of intact controls during the juvenile and post-pubertal phases of development. Following puberty, both the castrated and intact animals exhibited an age-related change in their play fighting; the frequency of initiating play fighting decreased and juvenile patterns of playful defense were replaced by more adult-like patterns. As these changes occurred even in the absence of the pubertal surge of gonadal hormones, they were more likely to result from the organizational effects of gonadal hormones in the perinatal period than the activational effects of these hormones at puberty. Although the castrated animals exhibited the age-related changes in behaviour, they did not exhibit the asymmetries in play associated with dominance relationships. As demonstrated in previous studies, in pairs of intact rats, the animal that attacks the most and uses more juvenile defenses during play fighting and weighs the least is typically the subordinate. In the castrates, asymmetries in weight and playful defense are not related to play frequency, indicating the absence of a dominance relationship. Although the characteristic changes in male play fighting at puberty are independent of the activational effects of gonadal hormones, dominance relationships and their associated changes in play fighting are dependent on these hormones. Therefore, in the perinatal period gonadal hormones most likely organize the age-related changes in play behaviour, whereas post-pubertally gonadal hormones activate dominance relationships and thus, indirectly modify play fighting by affecting dominance-associated assymetries in behaviour. © 1996 Wiley-Liss, Inc.     

Individual differences in risk perception versus risk taking: handedness and interhemispheric interaction

Research indicates that right-hemisphere mechanisms are specifically sensitive to and averse to risk. Research also indicates that mixed degree of handedness is associated with increased access to right hemisphere processing. Accordingly, it was predicted that mixed-handers would exhibit greater risk aversion. Participants were presented with various risky activities and were asked to rate (i) the perceived risk, (ii) the perceived benefit, and (iii) their likelihood to engage in each activity. No handedness differences were found for any of these ratings. Regression analyses, however, indicated that the likelihood to engage in risky activities was predicted primarily by the perceived risks in mixed-handers and by the perceived benefits in strong-handers.     

Preschoolers' aggression, affiliation, and social dominance relationships: An observational, longitudinal study

This study of 61 preschool children used an observational, longitudinal design to examine the degree to which social dominance relationships account for time-related change in rates of aggression and affiliation across a school year. Specific hypotheses reflected the view that, over time, behavioral function should change in accord with the stability of social dominance relationships, social norms, and on-going developmental processes. Results showed that change in rates of aggression was non-linear (i.e., increasing then decreasing over the year), that physical and verbal forms of aggression were associated with distinct longitudinal trajectories, and that these trajectories were related to rates of affiliation and visual regard. As predicted, social dominance accounted for significant variation in these patterns. Implications for theory, future research, and school practitioners are discussed.     

Empirical test of bullies' status goals: assessing direct goals, aggression, and prestige

The literature suggests that status goals are one of the driving motivations behind bullying behavior, yet this conjecture has rarely if ever been examined empirically. This study assessed status goals in three ways, using dyadic network analysis to analyze the relations and goals among 10-11 and 14-15 year olds in 22 school classes (N boys=225; N girls=277). As a validation bullies were contrasted with victims. Bullies had direct status goals (measured with the Interpersonal Goal Inventory for Children) and showed dominance as measured with proactive aggression. Moreover, as predicted from a goal perspective, bullying behavior was related to prestige in terms of perceived popularity. In contrast, victims lacked status goals, were only reactively aggressive, and low on prestige. That being popular is not the same as being liked could be shown by the fact that bullies were just as rejected as victims by their classmates. Eighth-grade bullies had more direct status goals than fourth-grade bullies, possibly indicating that striving for the popularity component of status increases in early adolescence.     

Force Control of Ankle Dorsiflexors in Young Adults: Effects of Bilateral Control and Leg Dominance

Abstract

We investigated whether bilateral lower-limb control and leg dominance affect force control ability in 15 healthy young adults (9 males and 6 females, age =26.8?±?4.1 years). Participants performed isometric ankle dorsiflexion force control tasks, matching a visual target (10% of maximal effort) as quickly and precisely as possible in ballistic and tonic tasks. Performance was evaluated using force error, force steadiness, amount of muscle activity of the tibialis anterior, and response time characteristics. Results showed no significant effects of leg dominance during both ballistic and tonic tasks, while bilateral condition resulted in significantly larger error, less force steadiness, compared to unilateral condition, and only during the tonic task. Consequently, bilateral control, specifically in tasks utilizing feedback control (i.e., tonic task) might affect force control ability, possibly because of the interhemispheric inhibition to meet bilateral task complexity and integrate afferent bilateral sensory information from both right and left legs.     

寻找丢失的自我——精神分裂症患者的自我面孔识别

为探索精神分裂症患者自我面孔识别的能力以及在视听整合任务中面孔对声音身份识别(同性和异性)的影响, 选取34名住院精神分裂症患者和26名健康被试, 分别进行单通道动态自我面孔识别任务、单通道自我声音识别任务和视听整合任务的3个实验。结果发现：精神分裂症患者的单通道自我面孔识别能力和自我声音识别能力与健康组无区别, 但在视听整合任务中, 精神分裂症患者的声音身份识别受到视觉通道面孔识别的影响。结果表明, 精神分裂症患者有自我面孔识别的能力, 自我面孔会促进自我声音的识别, 并抑制对同性他人声音和异性他人声音的识别。