A mixed effects negative binomial analysis of road mortality determinants in Sub-Saharan African countries

This paper uses aggregate data for a panel of 23 Sub-Saharan African countries to explore the potential predictors of road traffic fatalities between 2001 and 2010. In addition to the Gross Domestic Product per capita, the set of covariates includes some demographic, safe driving behavior, health and infrastructure-related variables. Estimations from a mixed effects negative binomial regression suggest that the fraction of populations aged between 15 and 64 years, the size of the road network and seat belt laws significantly increase fatalities. However, populations of age 65 and above, hospital beds and physicians’ densities, and road audits significantly decrease these fatalities. Moreover, traffic fatalities are found to increase with the Gross Domestic Product per capita. The economic implications of this finding is not to lower the economic growth but to design policies and technologies that could prevent African countries from experiencing the same road tragedy observed in industrialized countries during their development process.     

积极刻板印象会产生消极影响?

积极刻板印象是对社会群体的积极特质的描述, 以往刻板印象的相关研究主要聚焦于消极刻板印象, 却忽略了对积极刻板印象尤其是其消极影响的探讨。基于此, 分别从种族、性别和年龄这三个方面详细梳理了积极刻板印象的积极影响和消极影响, 并阐述了其产生的条件, 包括积极刻板印象的微妙激活和明显激活、积极刻板印象的准确表述和极端表述、积极刻板印象阐述者的内外群身份、呈现积极刻板印象的文化背景等。未来研究可从集体主义文化、研究领域和对象, 干预方法和消极刻板印象的积极影响等方面进一步探讨。     

Social comparisons and quality of life among survivors of childhood cancer and their mothers

Abstract

Sixty-three survivors of childhood cancer (mean age 17 years), currently well and off-treatment, and their mothers were interviewed individually about their experiences and the impact of their illness on their lives. Survivors also completed four questionnaire measures of different aspects of quality of life (perceptions of illness experience, future worries, health problems and body image satisfaction), whereas mothers recorded their perceptions of their child's quality of life on the same four scales. These scales showed good internal consistency and convergent validity for both survivors and mothers. Mothers also completed a measure of their own quality of life (the SF-36). The interviews with both survivors and mothers were content-analysed for statements expressing social comparisons. These statements were coded according to whether the comparison implied a favourable, neutral or unfavourable evaluation of the individual survivor. Mothers who made a higher proportion of unfavourable comparisons reported worse adjustment for their child on all four scales and described their own quality of life more negatively. Among survivors, those who made a higher proportion of unfavourable comparisons gave significantly more negative self-ratings on one of the four scales. Correlations between survivors' and mothers' ratings on the four scales were positive, but comparatively low. This reinforces concerns about using parents as proxy judges of young people's quality of life, although the correlations were more satisfactory in the case of younger rather than older (>18.5 years) survivors. Mothers who rated their own quality of life as less satisfactory reported more problems for their child on all four scales, irrespective of how the survivors described themselves.     

Approaching Success or Avoiding Failure? Approach and Avoidance Motives in the Work Domain

In our set of studies, we extended research on approach and avoidance motivations by investigating (i) motives in a work setting, (ii) interactions among approach and avoidance motives, and (iii) motives at implicit levels. Results of Studies 1 through 3 provided support for the construct validity of our work motives measure by demonstrating that approach and avoidance work motives are markers of more general approach and avoidance temperaments, they are distinct from other individual difference variables commonly studied by organisational psychologists (e.g. conscientiousness, regulatory focus and cognitive ability) and they are stable over time. In Studies 4 through 7, we confirmed our predictions that approach and avoidance motives predict employees' goal orientations, job appraisals and attitudes (e.g. job satisfaction and perceived support) and supervisor‐rated job behaviours (e.g. task performance and citizenship behaviour). Importantly, we provide the first empirical evidence that approach and avoidance motives interact to predict task performance and that the motives operate at implicit levels. Copyright © 2012 European Association of Personality Psychology     

In search of durable positive psychology interventions: Predictors and consequences of long-term positive behavior change

A number of positive psychology interventions have successfully helped people learn skills for improving mood and building personal resources (e.g., psychological resilience and social support). However, little is known about whether intervention activities remain effective in the long term, or whether new resources are maintained after the intervention ends. We address these issues in a 15-month follow-up survey of participants from a loving-kindness meditation intervention. Many participants continued to practice meditation, and they reported more positive emotions (PEs) than those who had stopped meditating or had never meditated. All participants maintained gains in resources made during the initial intervention, whether or not they continued meditating. Continuing meditators did not differ on resources at baseline, but they did show more PE and a more rapid PE response to the intervention. Overall, our results suggest that positive psychology interventions are not just efficacious but of significant value in participants’ real lives.     

Is scanning in probed order recall articulatory?

We consider how theories of serial recall might apply to other short-term memory tasks involving recall of order. In particular, we consider the possibility that when participants are cued to recall an item at an arbitrary position in a sequence, they covertly serially recall the list up to the cued position. One question is whether such “scanning” is articulatory in nature. Two experiments are presented in which the syllabic length of words preceding and following target positions were manipulated, to test the prediction of an articulatory-based mechanism that time to recall an item at a particular position will depend on the number of preceding long words. Although latency was dependent on target position, no word length effects on latency were observed. Additionally, the effects of word length on accuracy replicate recent demonstrations in serial recall that recall accuracy is dependent on the word length of all list items, not just that of target items, in line with distinctiveness assumptions. It is concluded that if scanning does occur, it is not carried out by covert or overt articulation.     

The effect of interstimulus interval on sequential effects in absolute identification

In absolute identification experiments, the participant is asked to identify stimuli drawn from a small set of items which differ on a single physical dimension (e.g., 10 tones which vary in frequency). Responses in these tasks show a striking pattern of sequential dependencies: The current response assimilates towards the immediately preceding stimulus but contrasts with the stimuli further back in the sequence. This pattern has been variously interpreted as resulting from confusion of items in memory, shifts in response criteria, or the action of selective attention, and these interpretations have been incorporated into competing formal models of absolute identification performance. In two experiments, we demonstrate that lengthening the time between trials increases contrast to both the previous stimulus and the stimulus two trials back. This surprising pattern of results is difficult to reconcile with the idea that sequential dependencies result from memory confusion or from criterion shifts, but is consistent with an account that emphasizes selective attention.     

Approach and avoidance as action effects

Numerous studies use arm movements (arm flexion and extension) to investigate the interaction between emotional stimuli and approach/avoidance behaviour. In many experiments, however, these arm movements are ambiguous. Arm flexion can be interpreted either as pulling (approach) or as withdrawing (avoidance). On the contrary, arm extension can be interpreted as reaching (approach) or as pushing (avoidance). This ambiguity can be resolved by regarding approach and avoidance as flexible action plans that are represented in terms of their effects. Approach actions reduce the distance between a stimulus and the self, whereas avoidance actions increase that distance. In this view, action effects are an integral part of the representation of an action. As a result, a neutral action can become an approach or avoidance reaction if it repeatedly results in decreasing or increasing the distance to a valenced stimulus. This hypothesis was tested in the current study. Participants responded to positive and negative words using key-presses. These “neutral” responses (not involving arm flexion or extension) were consistently followed by a stimulus movement toward or away from the participant. Responses to emotional words were faster when the response's effect was congruent with stimulus valence, suggesting that approach/avoidance actions are indeed defined in terms of their outcomes.     

Age and synchrony effects in visuospatial working memory

Younger and older adults were administered a computerized version of the Corsi Block visuospatial working memory (VSWM) span task at either their peak or off-peak time of day and in either a high-interference (ascending order of administration, starting with short lists first) or low-interference (descending order, starting with longest lists first) format. Young adults' span scores were highest in the ascending format. By contrast, older adults performed better in the low-interference format, replicating findings with verbal memory span studies. Although both age groups benefited from being tested at their peak time, the advantage was far greater for older adults, but only in the low-interference format; their scores on the high-interference format were not helped by peak-time testing. These findings are consistent with the suggestion that young adults' performance on span tasks is influenced by practice and strategies, but the performance of older adults is heavily influenced by interference—which is best controlled at peak times of day. Our findings suggest that both time of testing and interference play critical roles in determining age differences in VSWM span, and both a reduction in interference and peak-time testing may be necessary to optimize older adults' performance and to maximize the reduction in age differences.