Response effects in the perception of conjunctions of colour and form

Summary Two experiments addressed the question whether visual search for a target defined by a conjunction of colour and form requires a central, serial, attentional process, but detection of a single feature, such as colour, is preattentive, as proposed by the feature-integration theory of attention. Experiment 1 investigated conjunction and feature search using small array sizes of up to five elements, under conditions which precluded eye-movements, in contrast to previous studies. The results were consistent with the theory. Conjunction search showed the effect of adding distractors to the display, the slopes of the curves relating RT to array size were in the approximate ratio of 2:1, consistent with a central, serial search process, exhaustive for absence responses and self-terminating for presence responses. Feature search showed no significant effect of distractors for presence responses. Experiment 2 manipulated the response requirements in conjunction search, using vocal responses in a GO-NO GO procedure, in contrast to Experiment 1, which used key-press responses in a YES-NO procedure. Strikingly, presence-response RT was not affected significantly by the number of distractors in the array. The slope relating RT to array size was 3.92. The absence RT slope was 30.56, producing a slope ratio of approximately 8:1. There was no interaction of errors with array size and the presence and absence conditions, implying that RT-error trade-offs did not produce this slope ratio. This result suggests that feature-integration theory is at least incomplete.     

Negative Recurrent Thinking as a Moderator of the Relationship Between Perceived Stress and Depressive Symptoms

Both perceived stress and negative recurrent thinking (rumination and worry) have been associated with depressive symptoms. However, no research to date has investigated the association between perceived stress and negative recurrent thinking. In the present study we aimed to explore whether perceived stress and negative recurrent thinking are associated and whether negative recurrent thinking moderates the relationship between perceived stress and depressive symptoms. A convenience sample of 273 undergraduate students completed the Perceived Stress Scale, the Ruminative Responses Scale-10, the Penn State Worry Questionnaire and the Hospital Anxiety and Depression Scale 2 weeks prior to sitting mid-year examinations. Correlation analyses showed that perceived stress, rumination and worry were positively and significantly associated with depressive symptoms and that perceived stress was positively and significantly associated with rumination and worry. A moderation analysis confirmed that negative recurrent thinking moderated the relationship between perceived stress and depressive symptoms. The implications of these findings are discussed.     

General analytical solution for stress intensity factor of a hypocycloid hole with many cusps in an infinite plate

In this article, the problem for the determination of the displacement functions and the stress intensity factors (SIFs) around a boundary of a hypocycloid hole with cusps in an infinite elastic plate subject to normal and shear stresses are presented. A hole with cusps (hypocycloid) is mapped onto a unit circle and the modified complex potential is used for solving the relevant boundary value problems. An analytical solution for the SIF of a hypocycloid hole is obtained. For a special case, our results agree with others.     

LEO-II and Satallax on the Sledgehammer test bench

Sledgehammer is a tool that harnesses external first-order automatic theorem provers (ATPs) to discharge interactive proof obligations arising in Isabelle/HOL. We extended it with LEO-II and Satallax, the two most prominent higher-order ATPs, improving its performance on higher-order problems. To explore their usefulness, these ATPs are measured against first-order ATPs and built-in Isabelle tactics on a variety of benchmarks from Isabelle and the TPTP library. Sledgehammer provides an ideal test bench for individual features of LEO-II and Satallax, revealing areas for improvements.     

Does childhood general cognitive ability at age 12 predict subjective well-being at age 52?

Drawing on a broad, multidimensional conceptualization of subjective well-being, this study examined the power of childhood general cognitive ability to predict life satisfaction, satisfaction with eight individual life domains, and the frequency of experiencing positive and negative affect in middle adulthood. Data were obtained from a representative Luxembourgish sample (N = 738; 53% female) in a longitudinal study conducted in 1968 and 2008. Childhood general cognitive ability was unrelated to life satisfaction, negatively related to negative affect and satisfaction with free time, and positively related to positive affect and satisfaction with some of the life domains associated with socioeconomic success (i.e. finances, self, housing, work, or health). This predictive power persisted even when childhood socioeconomic status was controlled.     

Search for meaning,finding meaning and adjustment in women following miscarriage: A longitudinal study

Objective: The purpose of this study was to explore the associations between meaning making and psychological adjustment in 127 women who experienced a miscarriage.

Design: A longitudinal and controlled study design was employed.

Main outcome measures: Meaning-making variables and distress outcomes were examined at four, seven and 16?weeks after miscarriage, in two groups of women, one who had medical investigations of the cause of their loss, and a control group receiving standard care.

Results: Search for meaning was very common and it declined with time after miscarriage. By seven weeks post-loss, more than half the women reported that they had found meaning/understood why the miscarriage happened. Providing information about the cause of the loss was associated with finding meaning. A decline in the search for meaning and finding meaning at seven weeks post-miscarriage, predicted levels of distress at 16?weeks, whilst controlling for the initial distress and for significant background factors.

Conclusions: This study provides support for the notion that search for meaning is very common following negative life events, such as miscarriage, and that finding meaning is important in many peoples’ process of adjustment. Providing information about the cause of the loss facilitates finding meaning.     

The Dark Triad and animal cruelty: Dark personalities,dark attitudes,and dark behaviors

Research examining the interpersonal interactions of those high on the Dark Triad has proliferated in recent years. Extant research, however, has not examined other types of relationships such as attitudes and behaviors towards animals. Further, there has been limited research examining the associations between personality and attitudes and behaviors towards animals generally. In this study, participants (N = 227) completed an online survey measuring the Dark Triad, attitudes towards animals, and acts of animal cruelty. The results revealed that individuals with higher levels of the Dark Triad demonstrated less positive attitudes towards animals and reported engaging in more acts of animal cruelty. Age and sex were found to be significant predictors of less positive attitudes and behaviors towards animals, independent of the Dark Triad. These results suggest that those callous and manipulative behaviors and attitudes that have come to be associated with the Dark Triad are not just limited to human-to-human interactions, but are also consistent across other interactions.     

Are risk preferences consistent?: The influence of decision domain and personality

This paper examines the consistency of risk preferences across three decision domains important in most people’s lives: work, health and personal finance. We consider the degree to which the five factor model of personality and a range of factors that influence risk-related decision-making (perceived risk, framing, emotions and cost–benefit analysis) impact upon cross-domain consistency. Data were gathered from a sample of participants for whom approaches to risk were likely to vary (academics, chess players, firefighters, mountaineers and City traders). The results showed that participants could be categorised into two groups: those who were consistent in their risk preferences in three decision domains, and those who were inconsistent or domain-specific. The consistent group was significantly lower on neuroticism and higher on agreeableness and conscientiousness with a less variable approach to weighing up the costs and benefits of taking risks than the inconsistent group. The majority of the consistent group was risk averse.When the domain-specific risk preferences of the inconsistent group were examined, data showed that different combinations of personality and decision-making factors predicted risk preferences within each domain.