Meta-analytic Decisions and Reliability: A Serendipitous Case of Three Independent Telecommuting Meta-analyses

Purpose  

Despite the potential for researcher decisions to negatively impact the reliability of meta-analysis, very few methodological studies have examined this possibility. The present study compared three independent and concurrent telecommuting meta-analyses in order to determine how researcher decisions affected the process and findings of these studies.     

Attention Network Performance and Psychopathic Symptoms in Early Adolescence: An ERP Study

Reaction time (RT) and event-related potential (ERP) measures were used to examine the relationships between psychopathic symptoms and three major attention networks (alerting, orienting, and executive attention) among a community sample of youth. Antisocial Process Screening Device (APSD; Frick and Hare 2001) total and subscale scores were negatively correlated with ERP measures of attentional alerting, indicating that youth with psychopathic symptoms had difficulty using warning cues to prepare for upcoming targets. APSD total scores were not related to performance on measures of orienting or executive attention, although weaker executive attention was found among youth with higher scores on the Impulsivity subscale. These findings support attention-based models of psychopathy and provide evidence of specific deficits in attentional alerting among youth with psychopathic traits. Deficiencies in attentional alerting may be related to noradrenergic functioning and may have cascading effects on higher order cognitive and affective processing.     

Effects of voluntary wheel running on heart rate, body temperature, and locomotor activity in response to acute and repeated stressor exposures in rats

Stress often negatively impacts physical and mental health but it has been suggested that voluntary physical activity may benefit health by reducing some of the effects of stress. The present experiments tested whether voluntary exercise can reduce heart rate, core body temperature and locomotor activity responses to acute (novelty or loud noise) or repeated stress (loud noise). After 6 weeks of running-wheel access, rats exposed to a novel environment had reduced heart rate, core body temperature, and locomotor activity responses compared to rats housed under sedentary conditions. In contrast, none of these measures were different between exercised and sedentary rats following acute 30-min noise exposures, at either 85 or 98 dB. Following 10 weeks of running-wheel access, both groups displayed significant habituation of all these responses to 10 consecutive daily 30-min presentations of 98 dB noise stress. However, the extent of habituation of all three responses was significantly enhanced in exercised compared to sedentary animals on the last exposure to noise. These results suggest that in physically active animals, under some conditions, acute responses to stress exposure may be reduced, and response habituation to repeated stress may be enhanced, which ultimately may reduce the negative and cumulative impact of stress.     

Anxious attachment and relationship processes: an interactionist perspective

Relationship processes in adult romantic relationships have been vastly studied under the aegis of attachment theory. Attachment theory is interactionist in nature, proposing that individual differences in levels of both attachment avoidance and anxiety predict an individual's thoughts, feelings, and behaviors in contexts that activate attachment concerns. A growing body of research is beginning to systematically test the conditions in which individual differences in attachment orientations both predict and fail to predict relationship processes. In this article, we focus on anxious attachment and review a program of research showing that the potentially destructive relationship processes typically observed in highly anxious individuals do not always appear in neutral or benign contexts, or when security needs are met. We argue that research needs to more thoroughly investigate the conditions that should, or should not, activate attachment concerns and thus result in links between individual differences in attachment orientations and relationship processes.     

Acute Stress Disorder: Conceptual Issues and Treatment Outcomes

Acute stress disorder (ASD) was included as a diagnosis to the 4th edition of the Diagnostic and Statistical Manual (American Psychiatric Association, 1994) as a way of describing pathological reactions in the first month following a trauma. Since that time, ASD has been the focus of some controversy, particularly regarding the theoretical basis and practical utility of the disorder. Despite this controversy, ASD has demonstrated usefulness in identifying individuals experiencing a high level of distress in the acute aftermath of a trauma as well as those at risk for developing posttraumatic stress disorder (PTSD). This paper reviews the clinical application of ASD, the current controversy surrounding its conceptual basis, and then discusses the dilemmas regarding this diagnosis that might occur in clinical practice. A review of the randomized control trial treatment outcome literature for ASD is also included in an effort to assist clinicians selecting interventions for clients recently exposed to traumatic events. Throughout this paper, the relationship between research and applied clinical practice is highlighted.     

Food-related stimuli increase desire to eat in hungry and satiated human subjects

In the present study, the effect of food-related cues on the desire to eat chocolate in hungry and satiated subjects was investigated. Subjects (n=46) were randomly assigned to either a hungry or satiated group and then assigned to a group receiving one of the following stimuli: taste (2 M&Ms), sight (a photograph of M&Ms), cognition (a passage describin M&Ms), or control (no stimulus). In each testing session, subjects rated their desire to eat chocolate before and after the 90-s presentation of the particular stimulus. Each subject was then given a half pound of M&Ms so that actual consumption could also be measured. Results indicated that, following the presentation of the sight and taste stimuli, the subjects’ desire to eat chocolate was significantly increased. Furthermore, no differences in chocolate consumption due to state of hunger or type of food-related stimulus presented were found.     

Recruitment modeling applied to longitudinal studies of group differences in intelligence

In longitudinal studies data is collected in a series of waves. Each wave after the first suffers from attrition. Therefore it can be difficult to discriminate between changes in sample parameters due to a longitudinal process (e.g. ageing) and changes due to attrition. The problem is particularly vexing if one of the purposes is to compare differences between two or more groups over time, because there may be differential attrition across groups. We refer to this as a recruitment problem, because the sample studied in any wave after the first can be thought of as having been recruited from a preceding wave. We present a mathematical model of the recruitment process. We then apply it to two large longitudinal studies, the British Cohort Survey 1970 and the National Child Development Study (1958), to demonstrate how we can identify effects expected from recruitment alone. As an illustration we show that differential recruitment would predict increasing differences between estimates of men's and women's intelligence as the studied sample ages.     

Legal consequences of dating violence: A critical review and directions for improved behavioral contingencies

As researchers and clinicians seek to better understand, prevent, and address violence in dating relationships among adolescents and young adults, there is also a need to better explore the possible legal consequences for perpetrators of aggression. The purpose of this paper is to review legal involvement in violent intimate relationships, with a specific focus on dating relationships, as these sanctions represent possible punishing consequences for violent perpetration. Punishing consequences of aggression, including legal interventions, could serve to lessen or eliminate violence in the current relationship and also circumvent possible aggression in future relationships. Implications of this review for clinicians, law enforcement, judiciary officials, and prevention programmers addressing dating violence are provided, along with directions for future research.     

Exploring Predictors of Outcome in the Psychosis Prodrome: Implications for Early Identification and Intervention

Functional disability is a key component of many psychiatric illnesses, particularly schizophrenia. Impairments in social and role functioning are linked to cognitive deficits, a core feature of psychosis. Retrospective analyses demonstrate that substantial functional decline precedes the onset of psychosis. Recent investigations reveal that individuals at clinical-high-risk (CHR) for psychosis show impairments in social relationships, work/school functioning and daily living skills. CHR youth also demonstrate a pattern of impairment across a range of cognitive domains, including social cognition, which is qualitatively similar to that of individuals with schizophrenia. While many studies have sought to elucidate predictors of clinical deterioration, specifically the development of schizophrenia, in such CHR samples, few have investigated factors relevant to psychosocial outcome. This review integrates recent findings regarding cognitive and social-cognitive predictors of outcome in CHR individuals, and proposes potential directions for future research that will contribute to targeted interventions and improved outcome for at-risk youth.