Visual exploration and hazard search strategies in a simulated road crossing task among primary and secondary school students in Tanzania

Pedestrians, cyclists, motorcyclists, and other vulnerable road users represent more than half of all road fatalities globally. In Tanzania, pedestrians account for a significant proportion of the death toll, accounting for 30% of all traffic fatalities (WHO, 2018) and a 2016 study conducted in Dar Es Salaam found that 87% of school-aged children walk to school (Draisin, 2016), highlighting that school-aged children are exposed to a high level of risk.The present work reports the results of a study conducted in primary and secondary schools in the Arusha Region of Tanzania which investigates the students’ road crossing mental representation, as well as their level of hazard perception awareness, through their declared gaze behaviour. The students were asked to identify and tell the areas where hazards could come from within three road crossing scenarios, thus exploring the mental representation of the visual exploration strategies applied by children and teenagers when crossing the road. Results showed the tendency to apply the “compliant gaze behaviour” pattern in a flexible manner and to integrate it with the exploration of other areas in the visual field, particularly by the senior students. Practical implications for planning effective pedestrian road safety training programs are discussed.     

Are choices based on conditional or conjunctive probabilities in a sequential risk-taking task?

In this study, we examined participants' choice behavior in a sequential risk-taking task. We were especially interested in the extent to which participants focus on the immediate next choice or consider the entire choice sequence. To do so, we inspected whether decisions were either based on conditional probabilities (e.g., being successful on the immediate next trial) or on conjunctive probabilities (of being successful several times in a row). The results of five experiments with a simplified nine-card Columbia Card Task and a CPT-model analysis show that participants' choice behavior can be described best by a mixture of the two probability types. Specifically, for their first choice, the participants relied on conditional probabilities, whereas subsequent choices were based on conjunctive probabilities. This strategy occurred across different start conditions in which more or less cards were already presented face up. Consequently, the proportion of risky choices was substantially higher when participants started from a state with some cards facing up, compared with when they arrived at that state starting from the very beginning. The results, alternative accounts, and implications are discussed.     

前瞻记忆的理论模型综述

前瞻记忆是相对于回溯记忆提出的一种特殊的长时记忆,是指记住在将来某个恰当的时间执行先前意向的行为。本文介绍了近年来研究者提出的前瞻记忆认知和提取机制的理论模型,并对其做了评述。最后,本文针对目前研究中的薄弱环节尝试性地提出了今后前瞻记忆研究进一步发展的方向。     

Patterns of maternal and infant imitation during play

In contrast to recent experimental studies that have sought to establish the infant's ability to imitate, the goal of the current study was to establish the actual performance of imitation by infants and their mothers during episodes of face-to-face play. Three-min play episodes of 20 mothers and their 13- to 16-week-old infants were videotaped. Instances of mouth openings, lip movements, tongue protrusions, smiling, and vocalizations by both partners were coded. Sequential analyses revealed stochastic patterns of imitation by both interactants. Mothers contingently imitated initiations by their infants and were more likely to make like initiations during action in the same category by their infants. Infants did not show onset-to-onset imitation but did show an increased likelihood to initiate actions when their mothers were engaged in a like action. That imitation by the mother is a pervasive characteristic of such interactions is consistent with earlier suggestions of its role in the acquisition of social and emotional skills. The results suggest that infants also display patterns of matching in early social interactions.     

Disruptive decisions to leave home: Gender and family differences in expatriation choices

I developed a theoretical model predicting how gender and family status would influence employee willingness to expatriate, international job search behavior, and expatriation decisions and tested the model in a longitudinal investigation. Australian employees comprising 230 females and 401 males with partners and/or children and 208 female and male childless singles were surveyed three times over three years. Employees who had greater personal agency and less family barriers were more willing to expatriate, to search for international jobs, and to eventually leave their home countries. Having a family restricted females’ ability to transform their willingness to expatriate into an international job search to a greater extent than it did males’. In turn, international job search predicted actual expatriation for a job. Overall, the expatriation interests of women with partners and/or children were least realized (most inhibited) in international job search and subsequent expatriation behavior. The interests of childless single employees were most realized. The study challenges current thinking on women’s willingness to expatriate by demonstrating that women are willing to expatriate, but family factors lead to women being less able to transform their willingness into an international job search than men, subsequently flowing on to women expatriating less for work than men.     

The conceptual grouping effect: categories matter (and named categories matter more)

Do conceptual categories affect basic visual processing? A conceptual grouping effect for familiar stimuli is reported using a visual search paradigm. Search through conceptually-homogeneous non-targets was faster and more efficient than search through conceptually-heterogeneous non-targets. This effect cannot be attributed to perceptual factors and is not explained by a long-term representational reorganization due to perceptual-learning. Rather, conceptual categories seem to modulate visual representations dynamically, and are sensitive to task-demands. Verbally labeling a visual target further exaggerates the degree to which conceptual categories penetrate visual processing.     

Job search as goal-directed behavior: Objectives and methods

This study investigated the relationship between job search objectives (finding a new job/turnover, staying aware of job alternatives, developing a professional network, and obtaining leverage against an employer) and job search methods (looking at job ads, visiting job sites, networking, contacting employment agencies, contacting employers, and submitting applications). In a sample of 205 employed individuals from Belgium and Romania, job search objectives were significantly related to job search methods even after job satisfaction was controlled. Furthermore, particular objectives predicted specific methods. While the finding a new job/turnover objective predicted all search methods, staying aware of alternatives predicted using job ads and sites; the network objective predicted networking and contacting employers; and the leverage objective predicted contacting employers. Results suggest that search objectives are important for understanding job seekers’ search behavior and support the view that job search is a self-regulatory process that begins with objectives which activate search behavior.     

不同控制水平下的汉字语义加工

字词语义的加工是否受其它加工过程或操纵手段的控制一直是自动化研究的热点,以往针对英文字词的研究结果不尽一致。本研究以在该类研究中比英文单词更具优越性的汉字为材料,采用部件搜索任务,通过操纵控制水平的强弱探讨汉字的语义加工是否受控制这一问题。实验一考察汉字的语义是否受浅水平加工和无意识操纵的控制（低控制水平）;实验二探讨增强了的控制水平是否能够控制语义的加工。结果在实验一中发现了语义负启动效应;实验二出现了正启动和负启动效应。该结果表明,控制机制并不能阻止汉字语义加工本身的发生,仅能对已经产生激活的语义进行调控,提示汉字的语义加工是不可控的。     

不同环境照度下手机屏幕亮度最优参数研究－以三星某手机为例

已有研究表明环境照度、计算机显示器的屏幕亮度和对比度会影响用户的任务操作绩效。本研究采用视觉搜索任务,从行为绩效、主观评价以及眼睛疲劳度指标来考察环境照度、手机屏幕亮度对视觉搜索绩效的影响,并提出在不同的环境照度下手机屏幕亮度的最优值设置参数。结果表明：（1）当手机屏幕亮度保持不变时,不同环境亮度下的搜索绩效差异显著。（2）当环境照度为0lx时,手机屏幕亮度的最优值在11cd/m2左右;环境照度为100lx时,手机屏幕亮度的最优值是68cd/m2左右,环境照度为500lx时,手机屏幕亮度最优值是257cd/m2左右。     

抑制控制在极小概率目标搜索任务中的作用

以往研究表明在视觉搜索任务中靶呈现的概率会显著影响搜索正确率, 尤其是在靶概率极小时, 漏报率极高。针对此现象存在截然不同的解释, 其中Wolfe等的“阈限”论最为盛行。本研究几个实验虽然验证了这一概率效应, 然而, 我们发现并不能将之归因于“阈限”变化, 相反, 这一效应的产生与抑制控制失败有直接的因果关系。在实验中, 如果要求被试按不同键对靶或非靶做出反应, 会因为非靶概率太高而产生优势反应, 导致漏报率较高; 相反, 当要求被试对靶进行计数或作标记时, 优势反应得到控制, 漏报率大幅度下降。另外, 本研究证明, 如果被试有较强控制优势反应的能力, 他们的搜索成绩也更好。这些结果说明, 抑制控制能力在靶概率较小的任务中会显著影响搜索正确率, 如果采用恰当的反应方式和招募有较强抑制控制能力的靶检测人员均能有效避免漏报错误。