动、静态视觉信息在真实世界视觉搜索中的作用

真实环境中的视觉搜索是人和动物赖以生存的重要能力。目前的视觉搜索研究多使用静态的观察者和静止的二维搜索对象, 侧重于探究注意在搜索中的作用; 现有的视觉搜索理论模型主要概括了影响搜索的自上而下的注意因素, 而将自下而上影响因素简单归结为影像显著性, 然而在真实环境中, 观察者或搜索对象是可以运动的, 搜索时可利用的视觉信息包括动态光流和静态影像结构信息。已有的视觉识别研究发现这两种信息相结合可以使观察者准确持久地识别场景、事件和三维结构。在现有视觉搜索理论模型中引入两种视觉信息可以较好还原真实环境中的搜索任务。我们提出研究构想和实验方案,探究利用动、静态视觉信息的视觉搜索过程, 从而完善现有的视觉搜索模型。我们认为充分利用环境信息可以提高搜索效率, 且在视觉搜索训练和智能搜索设计等方面有重要的应用价值。     

Organizational identification and “currencies of exchange”: integrating social identity and social exchange perspectives

We integrate social exchange and social identity perspectives to propose and test the prediction that depending on their level of organizational identification, people may reciprocate the received organizational support using different “currencies of exchange”—reducing turnover intentions or, instead, engaging in extra‐role behavior. Specifically, the relationship of perceived organizational support (POS) with turnover intentions is proposed to be stronger with lower identification, whereas POS is proposed to be more closely related to extra‐role behavior with higher organizational identification. These predictions were supported in a cross‐sectional survey of N = 1,000 employees of a financial services firm. These results speak to the added value of integrating the social exchange perspective with its roots in applied psychology and the social identity perspective with its roots in social psychology in understanding the employee‐organization relationship.     

Job emotions and job cognitions as determinants of job satisfaction: The moderating role of individual differences in need for affect

Research has shown that job satisfaction is determined by both cognitions about the job and affect at work. However, findings from basic and applied attitude research suggest that the extent to which attitudes are based on affective and cognitive information is contingent on stable individual differences, in particular need for affect. Based on current conceptualizations of job satisfaction as an attitude toward the job, we hypothesized that job satisfaction depends more on affect and less on cognitions, the higher a person's need for affect is. To test these hypotheses, we conducted two correlational studies (N = 194 university employees; N = 134 employees from various organizations) as well as an experimental study (N = 191 university employees) in which the salience of positive versus negative job cognitions was varied. Results supported our hypotheses. We discuss theoretical and practical implications of these differences in affective and cognitive underpinnings of job satisfaction.     

菜单界面设计的认知工效学研究方法

菜单研究是人 -计算机交互研究的重要内容之一。本文以研究方法的发展过程为主线 ,回顾了菜单界面认知工效学研究的历程 ,分别讨论了传统实验方法、系统仿真方法和眼动追踪方法在菜单界面设计研究中的应用     

绩效评价的若干问题

通过对绩效的内涵、绩效评价标准的确定、评量指标体系的构建以及多样性评量指标的整合意义与方法等四个绩效评价的最基本问题进行反思 ,提出如下观点 :(1 )对绩效进行考量时必须同时考虑时间、方式和结果三个维度。 (2 )绩效评价标准的确定应先于具体评量指标的选择 ,且应保持一定的稳定性 ,不可随意增删 ;(3 )评量指标体系的构建应本着贵精不贵多、贵明确不贵模糊、贵敏感不贵迟钝 ,贵关键不贵空泛的原则进行 ;(4)多样性评量指标是否整合需根据具体的需要而定 ,整合时要考虑评量指标本身的权重差异以及不同评价者由于对标准尺度掌握的松紧不一和评判角度不同所带来的对最终评价结果的影响。     

注意视觉搜索研究的新进展

一个时期以来有关注意视觉搜索的研究认为,注意是以系列搜索或平行搜索方式进行的.而Wolfe(1998)通过对10多年有关研究数据整理画出的坡度曲线图则表明,注意视觉搜索坡度的整体分布是没有波峰的,表明系列搜索或平行搜索理论是错误的.而且,他新近研究又表明注意视觉搜索同样遵循认知经济原则:自由无序扫描是比系统扫描更快发现项目的方式.     

Preattentive Perception of Multiple Illusory Line-Motion: A Formal Model of Parallel Independent-Detection in Visual Search

The phenomenon referred to as illusory line-motion (ILM; O. Hikosaka, S. Miyauchi, & S. Shimojo, 1993a) has been described as a measure of the local facilitation of attention gradient. However, J. Kawahara, K. Yokosawa, S. Nishida, and T. Sato (1996) have demonstrated a spatially parallel search for an “odd man out” in the ILM direction. Apart from showing preattentive ILM perception in terms of an analogy between line-motion and apparent motion, the authors examined whether ILM perception is possible without attention from another point of view. Four experiments revealed that the ILM target can be detected in parallel without invoking attentional facilitation and invalidated the possible contribution of attentional set in parallel ILM search. Participants were able to correctly detect the ILM target among multiple nontargets, even when the line orientation was changed from trial to trial. The authors' independent-detection model predicted ILM search performance well on several occasions. These findings strongly support a preattentive and stimulus-driven explanation of ILM perception.     

Flexible target representations underlie repetition priming in visual search

Repeating target features across consecutive visual search trials can influence response time. Three experiments are reported that show that this repetition priming is dependent on the exact stimulus configuration and feature type. In Experiment 1 the target was defined relative to distractors by its orientation and target colour was task irrelevant. The roles played by these features were reversed in Experiment 2. Repeating target colour across trials speeded responses in both Experiments 1 and 2. Repeating orientation significantly slowed responses in Experiment 1 but had no significant effect in Experiment 2. Existing feature-based and episodic memory-based explanations of priming cannot account for these data, but instead more flexible explanations are required. Experiment 3 showed that significant positive priming results from repeating distractor-defining orientation, indicating that priming of pop-out effects previously reported in the literature may result from combined target and distractor effects.     

Searching for faces in crowd chokepoint videos

Investigations of face identification have typically focussed on matching faces to photographic IDs. Few researchers have considered the task of searching for a face in a crowd. In Experiment 1, we created the Chokepoint Search Test to simulate real-time search for a target. Performance on this test was poor (39% accuracy) and showed moderate associations with tests of face matching and memory. In addition, trial-level confidence predicted accuracy, and for those participants who were previously familiar with one or more targets, higher familiarity was associated with increased accuracy. In Experiment 2, we found improvements in performance on the test when three recent images of the target, but not three social media images, were displayed during searches. Taken together, our results highlight the difficulties inherent in real-time searching for faces, with important implications for those security personnel who carry out this task on a daily basis.