The influence of initial and final precision on motor planning: individual differences in end-state comfort during unimanual grasping and placing

People will often grasp an object with an uncomfortable initial grasp if this affords more comfort at the end of the movement. The authors' primary objective was to examine whether grasp planning is influenced by precision demands at the start and end of the movement. Twenty right-handed individuals performed a unimanual grasping and placing task in which the precision requirements at the start and end of the movement were either identical (low initial and final precision, high initial and final precision) or different (low initial and high final precision, high initial and low final precision). The major finding to emerge was the presence of individual differences. 50% of participants changed their initial grasps based on the precision requirements of the task, and were more likely to satisfy end-state comfort when the final precision requirements were high than when they were low. In contrast, 50% of participants generally planned their movements to satisfy end-state comfort (regardless of precision requirements). The authors hypothesized that the former group of participants was sensitive to the precision demands of the task, and participants planned their grips in accordance with these demands. In contrast, the latter group of participants reduced the cognitive costs by using previously successful grasp plans.     

An Experimental Investigation of Cognitive Defusion

The current study compared cognitive defusion with other strategies in reducing the impact of experimentally induced negative emotional states. Sixty-seven undergraduates were assigned to one of three conditions (cognitive defusion, thought suppression, or control) and instructed in standardized approaches relevant to each condition before viewing film clips intended to elicit fear, sadness, and disgust. Participants then rated their experience of each emotion and completed a Stroop task intended to indirectly measure emotional arousal. While participants did not show any differences in their experience of emotions through self-report, significant differences on the Stroop task provided evidence of varying degrees of arousal between participants using defusion, suppression, and control strategies, with thought suppression and defusion showing the greatest reduction in arousal. These findings were retained after controlling for individual differences in negative affect and suggest that defusion is an effective strategy for reducing emotional distress but raise questions about the specific mechanisms involved in the process.

     

Integrating Social Identity and the Theory of Planned Behavior: Predicting Withdrawal from an Organizational Recruitment Process

This study develops and tests a model of applicant withdrawal. Drawing on tenets from social identity theory and the theory of planned behavior, this study proposes that applicants who highly identify with an organization will experience higher pursuit intentions and subsequently be less inclined to withdraw from recruitment. Data were collected from a sample of 669 applicants to the U.S. military at 2 intervals, separated by 3 months. Strong support was found for the proposed theoretical model. Implications for research and practice will be discussed.     

The planning and control model (PCM) of motorvisual priming: reconciling motorvisual impairment and facilitation effects

Previous research on dual-tasks has shown that, under some circumstances, actions impair the perception of action-consistent stimuli, whereas, under other conditions, actions facilitate the perception of action-consistent stimuli. We propose a new model to reconcile these contrasting findings. The planning and control model (PCM) of motorvisual priming proposes that action planning binds categorical representations of action features so that their availability for perceptual processing is inhibited. Thus, the perception of categorically action-consistent stimuli is impaired during action planning. Movement control processes, on the other hand, integrate multi-sensory spatial information about the movement and, therefore, facilitate perceptual processing of spatially movement-consistent stimuli. We show that the PCM is consistent with a wider range of empirical data than previous models on motorvisual priming. Furthermore, the model yields previously untested empirical predictions. We also discuss how the PCM relates to motorvisual research paradigms other than dual-tasks.     

Evaluating a Comprehensive Strategy to Improve Engagement to Group-based Behavioral Parent Training for High-risk Families of Children with ADHD

Behavioral parent training (BPT) is an evidence-based intervention for the treatment of attention-deficit/hyperactivity disorder (ADHD) and related disruptive behavioral disorders of childhood. Despite convincing data on effectiveness, engagement to BPT, particularly for high-risk families, has been a long standing, yet understudied, issue. Data from a clinical trial of a comprehensive BPT approach to enhance engagement and outcomes (the Strategies to Enhance Positive Parenting [STEPP] program) are presented herein. The STEPP program was compared to a traditional group-based BPT program on propensity to attend treatment, propensity to complete homework over the course of treatment, and dropout from BPT. Additionally, factors empirically related to engagement to treatment and targeted by the STEPP program were analyzed to determine whether these factors were enhanced by participation in the STEPP program. In a randomized cohort of 80 single-mothers of school-age children with ADHD, analyses demonstrated that the STEPP program lead to greater propensity to attend treatment over time and a greater propensity to complete homework over the course of treatment. Furthermore, participation in the STEPP Program was associated with a lower rate of dropout. Finally, data suggested that parents assigned to the STEPP program reported significant improvements in factors empirically related to engagement that were targeted within the STEPP program (i.e., amount and quality of social support from their group members, expectations for treatment, and perceived barriers to treatment participation). Results of the study have implications for targeting engagement throughout the process of BPT, particularly for high-risk families.     

The relationship of fear of falling and balance confidence with balance and dual tasking performance

According to traditional conceptualizations of the relationship between fear of falling and falls in older adults, fear of falling is considered to be predictive of falls because it leads to activity avoidance which, in turn, leads to de-conditioning that increases fall risk. The recent literature has begun to challenge such conceptualizations. Specifically, it has been argued that fear of falling and anxiety, in and of themselves, have a direct negative effect on balance. In this study we manipulated anxiety level by asking older research participants to walk either on the floor (low anxiety condition) or an elevated platform (high anxiety condition). Half the time participants carried a tray (dual tasking) and half the time they did not. Manipulation checks (involving heart rate, galvanic skin response, and self-reported anxiety measurement) confirmed that the experimental manipulation was successful in affecting anxiety level. The results demonstrate that the experimental manipulation (platform vs. floor) affected balance parameters and dual tasking performance with the platform condition resulting in a less stable gait. In addition, increased task demand (i.e., dual tasking) also had a negative effect on balance performance. Finally, the results demonstrate that the paper and pencil measures of fear can also predict balance performance (although the variance accounted for is small) even after controlling for medical risk factors for falling. Implications for models of fear of falling are discussed.     

Personality disorders and dimensions in pathological gambling

Comorbid DSM-IV Axis II personality disorders appear to be common in pathological gambling (PG) and may contribute to the chronic problems often associated with the disorder. This study sought to examine the relationship between PG, personality disorders, and impulsivity in a sample of pathological gamblers. Personality assessments included the SCID-II, Eysenck Impulsiveness Questionnaire, Tridimensional Personality Questionnaire, and Barratt Impulsiveness Scale. A total of 77 individuals with DSM-IV PG were included in this study, of which 35 (45.5%) met criteria for at least one personality disorder. Specific aspects of impulsivity were associated with certain personality disorders in PG when grouped by cluster, yet the presence of a personality disorder was not positively correlated with gambling severity. It remains unclear how the presence of a personality disorder and aspects of impulsivity may affect treatment outcome. Further exploration of these disorders and dimensions of personality may encourage a more inclusively global treatment approach.     

Alternate Approaches to Understanding the Psychometric Properties of Assessment Centers: An analysis of the structure and equivalence of exercise ratings

The present study uses an alternate analytical framework to examine the degree to which performance is differentiated by dimensions in assessment center (AC) exercises and whether these performance dimensions are rated on the same scale across exercises. Confirmatory factor analysis likelihood ratio tests supported the presence of three broad latent performance dimensions in each of three AC exercises. Additional tests revealed that five of six manifest performance dimensions were rated on the same psychological scale across exercises. Taken together, our results support a multidimensional interpretation of AC exercises and provide empirical support to the notion that differences in AC performance across exercises reflect true performance, rather than a measurement artifact.