Multicriteria Optimization Technique for Optimal Design of Orthotropic Bridges

The design improvement of large‐scale structures such as cable stayed and suspension bridges with large spans is one of the major engineering optimization problems faced by design engineers. In many real‐life engineering design problems, it is necessary to carry out large‐scale experimental physical models for only one prototype to construct the feasible solution set that is too expensive and not practical. For these reasons, an experimental search for optimal solutions is often not carried out at all. This paper presents a technique for multicriteria analysis, which involve the finite element analysis of the prototype in the optimization process. The improvement of the Suez Canal Bridge in Egypt is introduced as a real‐life large‐scale case study. The parameter space investigation method, the visual basic for application programming language, and Femap as finite element analysis software provide an implementation tools to construct the feasible and Pareto solution sets for the studied bridge. An efficient combination between the parameter space investigation method and the finite element programme was successfully investigated to obtain the Pareto solution set. This study shows possibility to apply the multicriteria optimization method for more applications on different large‐scale structural systems in the future. Copyright © 2013 John Wiley & Sons, Ltd.     

Depressive and Anxious Symptomatology Moderate the Relationship Between Childhood Emotional Abuse Severity and Attentional Bias on the Modified Stroop Task

Research has demonstrated that the impact of childhood abuse often outlasts the initial abuse experiences, paving the way for a myriad of psychological difficulties in adulthood. Attentional bias might serve as a pathway from childhood abuse to negative outcomes associated with such experiences. The primary aim of the study was to investigate the impact of childhood emotional abuse (CEA) experiences on the presence of attentional bias in a sample of college women by comparing performance on a modified Stroop task between CEA survivors (n = 28) and a nonabused control group (n = 31). Results suggest that for CEA survivors, psychological symptoms moderated the relationship between CEA severity and attentional bias to specific word types. Results underscore the importance in continued exploration of the relationship among childhood emotional abuse, attentional bias, and concurrent psychopathology. Results also suggest that modification of attentional biases, via cognitive bias modification procedures, could help mitigate the impact of childhood abuse experiences on psychological well-being in adult survivors.     

Executive Functioning and Gambling: Performance on the Trail Making Test is Associated with Gambling Problems in Older Adult Gamblers

ABSTRACT

Rates of gambling problems in older adults have risen with increased accessibility of gambling venues. One possible contributor to problem gambling among older adults is decreased self-control brought about by diminished executive functioning. Consistent with this possibility, Study 1 revealed that older adults recruited from gambling venues reported greater gambling problems if they also experienced deficits in executive functioning, measured via the Trail Making Test. Study 2 replicated this finding and demonstrated that problem gambling is associated with increased depression among older adults, mediated by increased financial distress. These studies provide support for the hypothesis that older adult gamblers who have executive functioning problems are also likely to have gambling problems.     

Attentional set protects visual marking from visual transients

When some distractors (old items) appear before others (new items) in an inefficient visual search task, the old items are excluded from the search (visual marking). Previous studies have shown that changing the shape of old items eliminates this effect, suggesting that shape identity must be maintained for successful visual marking. However, the contribution of top-down target knowledge to the maintenance of visual marking under shape change conditions has not been systematically examined. The present study tested whether the vulnerability of visual marking to shape change is contingent on observers' attentional set, by manipulating compatibility of the set and the domains in which the change occurs. The results indicated that visual marking survived shape changes when the observer's attentional set was consistent with critical features between the old and new items. This protection was observed when the set was based on explicit instructions at the beginning of the experiment, and when the task set was implicitly carried over from the previous task. These results suggest that top-down processes play a role in maintaining memory templates by enhancing the grouping and suppression processes during visual search, despite disruptive bottom-up signals.     

情绪对注意功能网络的调制

情绪性注意是一种对具有情绪意义的刺激进行选择和加工的注意.由于刺激的情绪效价能调制人脑的感知和注意系统,因而,与对中性刺激的注意相比,情绪性注意的神经机制更加复杂.较早的研究显示,杏仁核对感知皮层的调制对情绪性注意起关键作用.近期的证据表明,杏仁核对注意功能网络的调制可能是其重要的神经机制.本文梳理了相关领域的研究证据,主要强调情绪性刺激对注意的警觉、定向和执行控制网络的调制,发现情绪性注意加工的认知神经机制可能涉及一个以杏仁核为核心的多重功能网络.     

Rumfitt on the logic of set theory

According to a famous argument by Dummett, the concept of set is indefinitely extensible, and the logic appropriate for reasoning about the instances of any such concept is intuitionistic, not classical. But Dummett's argument is widely regarded as obscure. This note explains how the final chapter of Rumfitt's important new book advances our understanding of Dummett's argument, but it also points out some problems and unanswered questions. Finally, Rumfitt's reconstruction of Dummett's argument is contrasted with my own preferred alternative.     

Effects of anxiety on the execution of police arrest and self-defense skills

We investigated the effects of anxiety on the execution of police officers' arrest and self-defense skills. Police officers (n=13) performed three tasks in which they kicked, blocked, or restrained an opponent who attacked them with a rubber knife (low anxiety, LA) or a shock knife (high anxiety, HA) in a within-subject design. We analyzed performance (on a 5-point Likert scale), movement times, posture, and movement velocity and acceleration. Results revealed that performance was worse in the HA compared to the LA condition. Furthermore, analysis of full-body movement showed that under increased anxiety, police officers' performance contained characteristics of avoidance behavior, such as faster reactions (to reduce the time being exposed to the threat), leaning further backward (kick), and ducking down (block). In line with recent theoretical developments, it appears that under increased anxiety, police officers were less able to inhibit stimulus-driven processing (fear of getting hit) and enforce goal-directed processing (perform the skill as well as possible) leading to avoidance behavior and a decrease in performance.     

The Influence of Anticipatory Processing on Attentional Biases in Social Anxiety

Research on cognitive theories of social anxiety disorder (SAD) has identified individual processes that influence this condition (e.g., cognitive biases, repetitive negative thinking), but few studies have attempted to examine the interaction between these processes. For example, attentional biases and anticipatory processing are theoretically related and have been found to influence symptoms of SAD, but they rarely have been studied together (i.e., Clark & Wells, 1995). Therefore, the goal of the current study was to examine the effect of anticipatory processing on attentional bias for internal (i.e., heart rate feedback) and external (i.e., emotional faces) threat information. A sample of 59 participants high (HSA) and low (LSA) in social anxiety symptoms engaged in a modified dot-probe task prior to (Time 1) and after (Time 2) an anticipatory processing or distraction task. HSAs who anticipated experienced an increase in attentional bias for internal information from Time 1 to Time 2, whereas HSAs in the distraction condition and LSAs in either condition experienced no changes. No changes in biases were found for HSAs for external biases, but LSAs who engaged in the distraction task became less avoidant of emotional faces from Time 1 to Time 2. This suggests that anticipatory processing results in an activation of attentional biases for physiological information as suggested by Clark and Wells.     

高趋近动机积极情绪对注意灵活性的影响

该研究通过两个实验探讨不同趋近动机强度的积极情绪对注意灵活性的影响。实验一中40名大学生被试分别在高趋近和低趋近动机积极情绪条件下完成隐性注意朝向任务;实验二以35名大学生为被试,考察高趋近动机积极情绪和中性情绪条件下的注意灵活性。两项实验结果表明,与低趋近动机积极情绪和中性情绪条件相比,高趋近动机积极情绪下个体的注意灵活性降低,实验结果支持情绪的动机维度模型。     

视觉搜索中风味引发对关联颜色的注意偏向

人们常将特定的颜色与风味联系起来形成色味联结, 而且颜色线索会影响风味感知, 这体现了视觉信息对味觉信息加工的跨通道影响。本研究通过两个行为实验, 考察了味觉信息是否也会影响视觉搜索。实验任务要求被试品尝饮品后对形状靶子进行视觉搜索, 并且操纵了味觉刺激的提示性以及靶子颜色与风味之间的关联性。实验1的结果表明, 当风味线索提示的靶子颜色是与风味关联的颜色时可以加快视觉搜索。但如果与该风味关联的颜色出现在干扰项上, 风味线索则无法促进视觉搜索。其后, 我们在实验2中排除了语义启动的混淆, 也发现了与实验1一致的结果。本研究的结果表明, 风味线索会引发对关联颜色的注意偏向, 证实了味觉刺激对视觉注意的跨通道影响, 为色味交互提供了新的实验证据, 揭示了跨通道影响可能的发生机制。