Comparing an interdependent and dependent group contingency to increase physical activity in students during recess

Physical activity produces important physiological, mental health, academic, and cognitive benefits in children and youth. Despite these advantages, a large proportion of this population does not meet the recommended amount of physical activity. Recent studies have shown that the interdependent (IGC) and dependent (DGC) group contingencies improve physical activity; however, no comparison of the effects of these contingencies on physical activity has been conducted. We used a multielement within a concurrent multiple baseline design across three classes to compare the effectiveness of group contingencies on physical activity. Both group contingencies increased physical activity, with the IGC producing slightly higher overall levels of physical activity at the classwide and individual levels of analyses. We also compared participants' positive and negative statements and found that, regardless of the group contingency in effect, participants emitted higher levels of positive statements about the contingency when they earned the reward than when they did not, suggesting that reward delivery influenced statements more so than the group contingency arrangement. Results are discussed within the context of treatment decisions and future research.     

知觉线索对元记忆监控的影响

近年来, 越来越多的证据表明知觉线索影响个体的高级认知--元记忆。元记忆指个体对自己学习和记忆活动的认知, 其核心成分是监测和控制。研究发现, 多种知觉线索(如字体大小、音量、文本清晰度、重量、亮度等)影响个体的元记忆监测(如学习判断和自信心评定)及控制(如学习时间分配)。这种影响可能是加工流畅性所致, 也可能基于人们的信念产生。未来研究有必要进一步探究知觉线索影响元记忆监控的条件, 并厘清加工流畅性和信念的具体作用。     

Retrospective accounts of recurrent parental physical abuse as a predictor of adult laboratory‐induced aggression

Child abuse has been frequently associated with adult aggression in its many forms. The Point Subtraction Aggression Paradigm (PSAP) is a popular laboratory‐based procedure derived from the retaliatory responses of participants engaged in a monetary‐reinforced computer game. PSAP responses have been found to discriminate between participants with and without violent, antisocial, substance abuse, and even contact‐sport athletic histories. The present study provided an initial test of the sensitivity of the PSAP and the Overt Aggression Scale (OAS) in discriminating between college students (n=28) with and without reported histories of recurrent physical abuse as defined by incidents of being pushed, shoved, struck, punched, or threatened with physical violence by a parent more than once every six weeks over 15 years of upbringing. PSAP responses were substantially higher (d=2.1) among participants reporting histories of recurrent parental physical abuse, with 46% (as opposed to 0% for controls) of these individuals generating PSAP responses in excess of 400 (average found for violent parolees). Group differences on the OAS were also considerable (>1 SD). Larger factorial designs examining relationships between a range of developmental variables (e.g., domestic abuse, physical abuse, sexual abuse, parental divorce, family climate, etc.) and adult PSAP responding may help advance present knowledge regarding the impact of childhood adversity on psychological development. Aggr. Behav. 30:217–228, 2004. © 2004 Wiley‐Liss, Inc.     

Infants' Physical World

Abstract— Investigations of infants' physical world over the past 20 years have revealed two main findings. First, even very young infants possess expectations about physical events. Second, these expectations undergo significant developments during the first year of life, as infants form event categories, such as occlusion, containment, and covering events, and identify the variables relevant for predicting outcomes in each category. A new account of infants' physical reasoning integrates these findings. Predictions from the account are examined in change-blindness and teaching experiments.     

Recruitment Strategies for a Home-Based Physical Activity Intervention for Breast Cancer Patients

Recruiting cancer patients for randomized trials investigating psychosocial interventions presents several unique challenges. This paper describes the challenges and yields for different recruitment methods used in Moving Forward, a randomized trial of a home-based moderate-intensity physical activity program for early-stage breast cancer survivors. Recruitment methods included letters sent to patients by their oncologists, direct referrals from oncologists, in-person recruitment in oncology clinics, referrals from nurses and medical assistants, passive recruitment, other mailings, and community outreach strategies. Of the 424 screenings completed, 86 (20.3%) participants were randomized. Physician letters yielded the greatest number of initial screenings (147; 34.7%) and participants randomized (28; 32.5%). In-person recruitment also proved to be a productive recruitment strategy; 14 (16.3%) of the participants were recruited via this strategy. Community outreach efforts did not provide as great a yield and were labor intensive. We discuss suggestions for recruitment of cancer patients in future trials.     

Why might poor sleep quality lead to depression? A role for emotion regulation

Disordered sleep is strongly linked to future depression, but the reasons for this link are not well understood. This study tested one possibility – that poorer sleep impairs emotion regulation (ER), which over time leads to increased depressive symptoms. Our sample contained individuals with a wide range of depression symptoms (current depression, N?=?54, remitted depression, N?=?36, and healthy control, N?=?53), who were followed clinically over six months and reassessed for changes in depressive symptom levels. As predicted, maladaptive ER mediated both cross-sectional and prospective relationships between poor sleep quality and depression symptoms. In contrast, an alternative mediator, physical activity levels, did not mediate the link between sleep quality and depression symptoms. Maladaptive ER may help explain why sleep difficulties contribute to depression symptoms; implications for interventions are discussed.     

A longitudinal investigation of older adults’ physical activity: Testing an integrated dual-process model

Objective: To assess the effects of conscious and non-conscious processes for prediction of older adults’ physical activity (PA), we tested a dual-process model that integrated motivational (behavioural intention) and volitional (action planning and coping planning) processes with non-conscious, automatic processes (habit).

Method: Participants (N = 215) comprised community-dwelling older adults (M = 73.8 years). A longitudinal design was adopted to investigate direct and indirect effects of intentions, habit strength (Time 1), and action planning and coping planning (Time 2) on PA behaviour (Time 3). Structural equation modelling was used to evaluate the model.

Results: The model provided a good fit to the data, accounting for 44% of the variance in PA behaviour at Time 3. PA was predicted by intentions, action planning, and habit strength, with action planning mediating the intention-behaviour relationship. An effect of sex was also found where males used fewer planning strategies and engaged in more PA than females.

Conclusions: By investigating an integration of conscious and non-conscious processes, this study provides a novel understanding of older adults’ PA. Interventions aiming to promote PA behaviour of older adults should target the combination of psychological processes.