Living and Learning: Reproducing Beliefs in Selective Experience

People's decisions shape their experience. For example, a recruitment officer decides between job applicants and cannot evaluate the suitability of rejected applicants. The selection decisions thus affect the content of the officer's experience of suitable and unsuitable applicants, and experiential learning is achieved from a selective sample of experiences. It is suggested that people's beliefs are sensitive to the content of the experienced sample, but the mind cannot adjust for the selectivity of the sample even when it results from the individual's own decisions. Two experiments with a recruitment task showed that incorrect prior beliefs survive experiential learning when the beliefs are reproduced and thus appear to be confirmed, in actual experience. When the task was to achieve high performance, incorrect prior beliefs persisted because they were reproduced in a smaller sample of selected job applicants. In contrast, when the task was focused on learning, a greater number of applicants were selected, and a more representative experience therefore revised incorrect beliefs. The actual content of the experienced sample is thus crucial for the persistence, as well as for the revision, of incorrect beliefs. Further, as predicted by the hypothesis of constructivist coding, when feedback was absent for rejected applicants, participants constructed “internal feedback” in line with the expectation that the rejected applicant was unsuitable. Thus, when fewer applicants were hired, participants came to believe that the actual proportion of suitable applicants was low. Finally, the implications for efforts to reduce bias and improve experiential learning are discussed. Copyright © 2012 John Wiley & Sons, Ltd.     

MOTOR PREPARATION,MOTOR EXECUTION,ATTENTION, AND EXECUTIVE FUNCTIONS IN ATTENTION DEFICIT/HYPERACTIVITY DISORDER (ADHD)

Attention and executive functions were investigated in medicated and unmedicated children with ADHD combined type using a novel selective reaching task. This task involved responding as rapidly as possible to a target while at times having to ignore a distractor. Results indicated that unmedicated children with ADHD showed slow and inaccurate responding. Slow responding reflected problems at the stage of movement preparation but not movement execution. An attentional impairment, rather than a motor planning problem per se, appeared to underlie the slow movement preparation. Inaccurate responding reflected problems with response inhibition and selective attention, impulsivity, set-shifting, and difficulties in maintaining vigilance. Although medicated children with ADHD did not show slow movement preparation, they did show some response inaccuracy, resulting especially from impulsive responding.These findings suggest that ADHD is characterized by slow motor preparation (but not motor execution), and deficits in selective attention, vigilance, and executive functions. Preliminary results suggest that stimulant medication may resolve some of these motor, attentional and executive function deficits.     

Friction and wear behaviour of Inconel 718 alloy fabricated by selective laser melting after heat treatments

ABSTRACT

The effect of heat treatments (solution and double aging) on friction and wear behaviour of Inconel 718 (IN718) alloy fabricated by selective laser melting (SLM) were studied. After heat treatment of solution and double aging, the friction and wear of the alloy have been improved. The worn surfaces of heat-treated IN718 alloy became smoother, and micro-ploughing became shallower. After solid solution hearting, a portion of the Laves phase ((Ni, Fe, Co)₂(Nb, Ti, Mo)) dissolves into the matrix, after which the γ″ phase (Ni₃Nb) andthe equilibrium phase of the δ phase (Ni₃Nb) precipitates during double ageing. After solution and double aging, nano-scale γ′ (Ni₃(Al, Ti)) and γ″ phases distribute homogeneously in the matrix, which improves the material hardness and wear resistance of the SLMed IN718 alloy.     

Temperature dependence of nucleation rate in a binary solid solution

The influence of regression (partial dissolution) effects on the temperature dependence of nucleation rate in a binary solid solution has been studied theoretically. The results of the analysis are compared with the predictions of the simplest Volmer–Weber theory. Regression effects are shown to have a strong influence on the shape of the curve of nucleation rate versus temperature. The temperature T_M at which the maximum rate of nucleation occurs is found to be lowered, particularly for low interfacial energy (coherent precipitation) and high-mobility species (e.g. interstitial atoms).     

The role of athletes' pain-related anxiety in pain-related attentional processes

Numerous researchers have highlighted the social determinants of athletes' attitude toward pain, yet little is known about the role of cognitive processes and emotions that are related to pain in sport endeavors. There is evidence, in a dot probe paradigm, that individuals with chronic pain selectively orient their attention toward pain-related stimuli, but no studies have differentiated between the two attentional processes of hypervigilance that are evident in athletes: facilitated detection of threat and difficulty in disengaging attention from threatening stimuli. In the present study using a dot probe paradigm, we examined whether professional rugby players (N=58) with high pain-related anxiety (HPA) would show an attentional bias for pain-related threat, and whether this hypervigilance would reflect difficulty disengaging from threat or facilitated detection of threat. Rugby players with HPA oriented their attention toward pain-related threat with a concomitant difficulty disengaging from threat. Difficulty disengaging from painful stimuli may increase anxiety, and thus be maladaptive in sport. This is the first study to identify pain-related anxiety as a vulnerability marker in athletes' attentional biases.     

Implicit Mental Processes in Ethical Management Behavior

This article examines the relationship between implicit mental processes and ethical decisions made by managers. Based on the dual-process view in social and cognitive psychology, it is argued that social cognition (e.g., moral judgments) can rely on two different modes of information processing. On one hand, moral judgments reflect explicit, conscious, and extensive cognitive processes, which are attributed to explicit attitude. On the other hand, moral judgments may also be based on implicit, automatic, and effortless processes referring to implicit attitude. To test this thesis, a study involving 182 participants was conducted. The results support the thesis.     

Influences on life aspirations among adolescents in a low-income community in Cape Town,South Africa

The aim of this study was to determine the influences on adolescents’ aspirations from a low-income community in Cape Town. A sequential mixed method exploratory design was used following two distinct phases. The qualitative phase comprised focus group interviews with 118 grade 12 learners attending a school in a low-income community (age range: 16–19 years) and focused on identifying factors influencing life aspirations. The quantitative phase with 191 adolescents (males?=?54.45 %, females?=?45.55 %); age range: 14–18 years) from the same community aimed to ascertain the influences of personal attributes on self-aspirations. Participants completed the Expectations/Aspirations measure, the New General Self-Efficacy Scale, the Rosenberg Self-Esteem Scale and the Multidimensional Scale of Perceived Social Support. Qualitative data were thematically analysed. Quantitative data were analysed using multiple regression. The findings revealed that self-efficacy, self-esteem and social support were the most critical factors influencing adolescents’ aspirations. Self-efficacy was a major determinant of life aspirations among the adolescents. Life skills programmes with youth from disadvantaged communities should seek to incorporate training aimed at developing adolescents’ self-efficacy.     

Figure-Ground Phenomena in the Perception of Physical and Social Stimuli

An instrument, the Grasha-Riechmann Student Learning Style Scales (GRSLSS), was developed to assess six student learning styles. These styles are Independent, Dependent, Avoidant, Participant, Collaborative, and Competitive. A “rational approach” was used to develop the GRSLSS and evaluate its construct validity. The process included professional and student inputs in special procedures for selecting scale items and designing criterion items. The utility of this approach is considered and problems critiqued. The rational approach yielded relatively high temporal reliability coefficients (range across scales r = .76 to r = .83; N = 269) and numerous meaningful correlations between criterion items and scale scores.     

Quantile Mediation Models: A Comparison of Methods for Assessing Mediation Across the Outcome Distribution

Recent introduction of quantile regression methods to analysis of epidemiologic data suggests that traditional mean regression approaches may not suffice for some health outcomes such as Body Mass Index (BMI). In the same vein, the traditional mean-based approach to mediation modeling may not be sufficient to capture the potentially different mediating effects of behavioral interventions across the outcome distribution. By combining methods for estimating conditional quantiles with traditional mediation modeling techniques, mediation effects can be estimated for any quantile of the outcome distribution (so-called quantile mediation effects). Estimation and inference techniques for quantile mediation effects are compared through simulation studies, and recommendations are given. The quantile mediation methods are further compared with the traditional mean-based regression approaches to mediation analysis through analysis of data from Healthy Places, a trial that is examining the effects of the community–built environment on resident obesity risk. We found the magnitudes of indirect (mediating) effects of walkability on BMI and waist circumference were substantially larger for the upper quantiles compared with the median or mean. Results suggest that restricting the examination of mediation to the mean of the outcome distribution provides an incomplete picture of proposed mediating mechanisms and in some cases may miss important mediational relationships to outcomes.