Sensitivity to reward frequency in boys with attention deficit hyperactivity disorder.

Compared the sensitivity of boys with and without attention deficit hyperactivity disorder (ADHD) to differences in reward frequency. Fifteen boys with ADHD as diagnosed in the Diagnostic and Statistical Manual of Mental Disorders (3rd ed., rev.; American Psychiatric Association, 1987) and a matched control group completed a signal-detection task in which correct identification of 1 stimulus was rewarded 3 times as often as correct identification of the other. Boys in the ADHD group completed the task twice, on and off medication. Group differences emerged in response bias toward the more frequently rewarded alternative. Boys in the control group showed a stable pattern of response bias, irrespective of which alternative they were last rewarded on. Boys in the ADHD group showed different patterns of response bias following rewards on the 2 alternatives. These results suggest children with ADHD were more sensitive to individual instances of reward compared with controls, whose response bias is governed more by their reinforcement history. Methylphenidate improved discriminability and reduced sensitivity to individual instances of reward in the boys with ADHD.     

The Creativity of Lying: Divergent Thinking and Ideational Correlates of the Resolution of Social Dilemmas

The goal of this study was to develop a measure of creativity that builds on the strengths of youth with autism spectrum disorders (ASD). The assessment of creativity focused on the visual-spatial abilities of these youth using 3D modeling software. One of the objectives of the research was to develop a measure of creativity in an authentic learning environment that built on the interests and creative talents of youth with ASD. Traditional creativity tests may underestimate the creativity of youth with ASD because of the tests’ constrained nature, such as having a time limit, being limited to paper and pencil, testing in an over- or understimulating environment, and overlooking visual-spatial ability. A random selection of 27 student 3D design projects (out of approximately 100 projects) was assessed using dimensions of fluency, flexibility, originality, and elaboration. The validity of this assessment was examined by comparing the creativity scores of the 27 projects to the creativity scores given by a team of Google experts (3D designers and software engineers). Results indicated that the scores were significantly correlated for three of the four dimensions of the creativity assessment. There was high inter-rater reliability among coders (M = .82) using intra-class correlation (ICC). Results suggest that this assessment process could be used as a visual-spatial creativity measure for youth with ASD, as well as a creativity measure used by employers to determine real-world creative potential in their employees, particularly those with neurodiversity.     

Humean dispositionalism

Humean metaphysics is characterized by a rejection of necessary connections between distinct existences. Dispositionalists claim that there are basic causal powers. The existence of such properties is widely held to be incompatible with the Humean rejection of necessary connections. In this paper I present a novel theory of causal powers that vindicates the dispositionalist claim that causal powers are basic, without embracing brute necessary connections. The key assumptions of the theory are that there are natural types of causal processes, and that manifestations of powers are identified with certain kinds of causal processes. From these assumptions, the modal features of powers are explained in terms of internal relations between powers themselves and the process-types in which powers are manifested.     

The relative contributions of subjective and objective measures of body shape and size to body image and disordered eating in women

This research explored the relative contributions of subjective perceptions of body weight and body shape/proportion, as well as objective measures of body mass index (BMI) and waist-to-hip ratio (WHR) to disordered eating, exercise involvement, and body image. One hundred and fifty-eight female university students completed questionnaires and provided body measurements for this study. Although an interaction between BMI and WHR was found for some measures (i.e., Eating Disorder Examination Questionnaire total and subscale scores), results indicated that BMI was consistently the better objective predictor of disordered eating and body image. Subjective perceptions of body weight and, to a lesser extent, body shape, were found to account for the greatest proportion of variance in the dependent measures (disordered eating, body esteem, and body dissatisfaction). Overall, these results offer more support for sociocultural theories emphasizing the importance of thinness for women, than evolutionary theories emphasizing the role of WHR.     

Mechanisms of Quality of Life and Social Support in Inflammatory Bowel Disease

Cognitive and social factors are essential considerations in inflammatory bowel disease (IBD) patient management, but existing research is limited. This study aims to expand the IBD literature by examining the relationship between social supports and QoL, while examining mechanisms in these relationships. Consenting patients attending an IBD outpatient clinic were provided a survey package (N = 164). Regressions evaluated predictors of IBD-QoL, and catastrophizing and optimism were examined as mediators between social support and IBD-QoL. Diminished IBD-QoL was predicted by younger age, greater negative spousal responses, and less perceived spousal support. Mediation models showed helplessness catastrophizing to be the lone mediator, acting as a mechanism between both negative spousal responses and perceived spousal support with IBD-QoL. Social interaction variables are associated with IBD-QoL, but patients’ experience of helplessness acts to reduce their ability to benefit from social support. Patient care should consider supportive social and cognitive factors to improve IBD-QoL.