Human variable ratio performance

The generality of the mathematical principles of reinforcement (MPR) was tested with humans. In Experiment 1A, participants’ mouse clicks were reinforced according to a series of variable-ratio (VR) values. In one condition, a situated task was used (searching for treasure on a map presented via a PC monitor); in the other, abstract version of the task, participants clicked on a white screen. Under the “map” condition, response rates increased with increasing ratio value before decreasing with further ratio increases; under the “no-map” condition, response rates decreased linearly from a peak at the smallest ratio. In Experiment 1B, the pattern of responding was confirmed under the “map” conditions using a different set of ratio values. In Experiment 2, reinforcer magnitude was manipulated using the “map” context. Response rates did not differ significantly when large rather than small cash reinforcers were delivered according to a VR 30 but were significantly higher when large rather than small cash reinforcers were delivered according to a VR 120. Together these experiments offer qualified support for extending MPR to the behavior of human participants.     

Utility of personality measurement of clinic patients with insomnia

An assessment study examining the relationship between sleep quality and personality style in individuals presenting to a sleep clinic with symptoms of insomnia was conducted. The protocol entailed standard clinical interviews conducted by a board certified sleep physician and licensed clinical psychologist. Participants were then assessed using a standard interview and the Millon Clinical Multi-axial Inventory III (MCMI-III) A follow-up appointment was conducted to provide interpretation and treatment recommendations from the interview and testing data. The results from a review of 210 cases are presented in terms of their sleep quality and dominant MCMI-III patterns. Preliminary multivariate analyses indicated two common profiles that correspond to the presentation of insomnia symptomology. These clusters were termed "avoidant" and "anxious" profiles, accordingly. Item content analyses were conducted via the Noteworthy Item classification in the MCMI-III manual to determine the viability of a category determined by the authors called Sleep Behavior Preoccupation. Of this sample 17% fit into the category.     

Subjective Importance of Masculinity as a Factor in Understanding Risky Sexual Attitudes and Behaviors among Sexual Minority Men

Sex Roles - In the present study we evaluated relationships among internalized stigma, subjective importance of masculine gender roles, and risky sexual attitudes and behaviors among men who...     

Predictors of attrition and weight loss success: Results from a randomized controlled trial

Attrition is a common problem in weight loss trials. The present analysis examined several baseline and early-treatment process variables, as predictors of attrition and outcome in a clinical trial that combined pharmacotherapy and behavior therapy for weight loss. Participants were 224 obese adults who were treated with sibutramine alone, lifestyle modification alone, combined therapy, or sibutramine plus brief lifestyle modification. Predictors included baseline characteristics (e.g., demographic, weight-related, psychological, and consumption-related variables), plus attendance, adherence, and weight loss in the early weeks of treatment. Outcomes were attrition and weight loss success (i.e., ≥5% reduction in body weight) at 1 year. Multivariable models, adjusting for other relevant variables, found that younger age and greater baseline depressive symptoms were related to increased odds of attrition (ps ≤ 0.003). Greater early weight loss marginally reduced the odds of attrition (p = 0.06). Predictors of weight loss success at 1 year were Caucasian ethnicity (p = 0.04), lower baseline depressive symptoms (p = 0.04), and weight loss during the first 3 weeks of treatment (p < 0.001). Thus, depressive symptoms at baseline were a significant predictor of both attrition and weight loss success. As a process variable, early weight loss appears to have more predictive value than early attendance at treatment sessions or early adherence.     

On Freedom’s Mystery

Philosophia - This paper argues that Peter van Inwagen’s argument for the mysteriousness of metaphysical freedom does not establish its conclusion. Van Inwagen’s argument involves the...     

The Intergenerational Association Between Parents’ Problem Gambling and Impulsivity-Hyperactivity/Inattention Behaviors in Children

Despite the well-established association between problem gambling and ADHD core categories of impulsivity-hyperactivity and inattention, the link between parents’ problem gambling and impulsivity-hyperactivity/inattention (IH/I) behaviors in children has not been investigated. This study investigated the association between parents’ problem gambling and children’s IH/I behaviors while controlling for potential confounding variables. A population-based prospective cohort followed-up from kindergarten to age 30, the Quebec Longitudinal Study of Kindergarten Children (QLSKC), provided data over three generations. Among 1358 participants at age 30, parents with a child aged 1 year or older (N = 468; Mean age = 4.65 years; SD = 2.70) were selected. Generalized Linear Models included measures of grandparents’ and parents’ problem gambling, parents’ IH/I behaviors in childhood, and a host of risk factors and comorbidities to predict IH/I in children. Intergenerational bivariate associations were observed between grandparents’ problem gambling, parents’ IH/I in childhood and problem gambling at age 30, and between parents’ IH/I, problem gambling, and children’s IH/I behaviors. Parents’ problem gambling predicted children’s IH/I behaviors above and beyond the effects of covariates such as family and socioeconomic characteristics, alcohol and drug use, depression symptoms and parents’ gambling involvement. Parents’ IH/I behaviors in childhood also predicted children’s IH/I and had a moderating, enhancing effect on parents’ problem gambling association with their offspring’s IH/I behaviors. Problem gambling is a characteristic of parents’ mental health that is distinctively associated with children’s IH/I behaviors, above and beyond parents’ own history of IH/I and of typically related addictive, psychopathological or socioeconomic risk factors and comorbidities.     

An Evidence-Based Clinical Approach to Suicide Prevention in the Department of Defense: The Collaborative Assessment and Management of Suicidality (CAMS)

There are few evidence-based approaches for the treatment of suicidality particularly within the Department of Defense settings (DoD) (Schoenbaum, Heinssen, &; Pearson, 2009 Schoenbaum, M., Heinssen, R. and Pearson, J. L. 2009. Opportunities to improve interventions to reduce suicidality: Civilian “best practices” for army considerations, Bethesda, MD: National Institute of Mental Health.  [Google Scholar]). This article describes a relatively new suicide-specific approach called the “Collaborative Assessment and Management of Suicidality” (CAMS). There is growing evidence that CAMS can meaningfully impact suicidal ideation, overall symptom distress, increase hope, and may positively impact non-mental health utilization. The prospect of using CAMS within military treatment facilities is discussed as a means of clinically assessing and treating suicidal ideation and related behaviors for military personnel.     

Dialectical behavior therapy group skills training in a community mental health setting: a pilot study

Effective and affordable therapies are needed for treating people with severe and persistent mental illness in a community mental health setting. In this pilot study, we evaluated the effectiveness of a modified dialectical behavior therapy (DBT) protocol for improving symptoms and functioning in a cohort of persons with severe and persistent mental illness. We provided six months of weekly DBT skills training in a group setting. Depression symptoms decreased significantly after treatment. There was a wide range of number of sessions attended, with a minority of the participants completing the full course of treatment. Increased attendance was correlated with improvements in depression symptoms, overall symptoms, quality of life, and community functioning. The study findings suggest that the group skills training component of DBT can be successfully implemented in a community mental health center and that further research to determine its efficacy in comparison to other treatments is warranted.