Establishing books as conditioned reinforcers for preschool children as a function of an observational intervention

We tested the effects of an observational intervention (Greer & Singer-Dudek, 2008) on establishing children's books as conditioned reinforcers using a delayed multiple baseline design. Three preschool students with mild language and developmental delays served as the participants. Prior to the intervention, books did not function as reinforcers for any of the participants. The observational intervention consisted of a situation in which the participant observed a confederate being presented with access to books contingent on correct responses and the participant received nothing for correct responses. After several sessions of this treatment, the previously neutral books acquired reinforcing properties for maintenance and acquisition responses for all three participants.     

Punitive versus compensatory reactions to injustice: Emotional antecedents to third-party interventions

The almost exclusive focus on punishment and inattention to compensatory alternatives in studies involving experimental games may yield patterns that do not accurately reflect how and when people respond to injustice, particularly if punishment and compensation are not psychologically equivalent approaches to justice restoration. In the current study, we examined participants' preference for punitive and compensatory actions, while also exploring emotional determinants and boundary conditions. Our results indicated that participants actually compensated victims more than they punished offenders and that the majority of participants assigned both. Furthermore, although both interventions were associated with emotional experiences of moral outrage toward the offender, self-focused emotions reflecting feelings of threat only predicted compensation and only when victims were aware that they had been victimized. These findings augment our understanding of third-party interventions, emphasizing the importance of considering response alternatives when studying the psychology of justice.     

Review of first trial responses in balance control: influence of vestibular loss and Parkinson's disease

The reaction to an unexpected balance disturbance is unpractised, often startling and frequently associated with falls. This everyday situation can be reproduced in an experimental setting by exposing standing humans to sudden, unexpected and controlled movements of a support surface. In this review, we focus on the responses to the very first balance perturbation, the so-called first trial reactions (FTRs). Detailed analysis of FTRs may have important implications, both for clinical practice (providing new insights into the pathophysiological mechanisms underlying accidental falls in real life) and for understanding human physiology (what triggers and mediates these FTRs, and what is the relation to startle responses?). Several aspects of the FTRs have become clear. FTRs are characterized by an exaggerated postural reaction, with large EMG responses and co-contracting muscles in multiple body segments. This balance reaction is associated with marked postural instability (greater body sway to the perturbation). When the same perturbation is repeated, the size of the postural response habituates and the instability disappears. Other issues about FTRs remain largely unresolved, and these are addressed here. First, the functional role of FTRs is discussed. It appears that FTRs produce primarily increased trunk flexion during the multi-segmental response to postural perturbations, thus producing instability. Second, we consider which sensory signals trigger and modulate FTRs, placing specific emphasis on the role of vestibular signals. Surprisingly, vestibular signals appear to have no triggering role, but vestibular loss leads to excessive upper body FTRs due to loss of the normal modulatory influence. Third, we address the question whether startle-like responses are contributing to FTRs triggered by proprioceptive signals. We explain why this issue is still unresolved, mainly because of methodological difficulties involved in separating FTRs from ‘pure’ startle responses. Fourth, we review new work about the influence of perturbation direction on FTRs. Recent work from our group shows that the largest FTRs are obtained for toe-up support surface rotations which perturb the COM in the posterior direction. This direction corresponds to the directional preponderance for falls seen both in the balance laboratory and in daily life. Finally, we briefly touch upon clinical diagnostic issues, addressing whether FTRs (as opposed to habituated responses) could provide a more ecologically valid perspective of postural instability in patients compared to healthy subjects. We conclude that FTRs are an important source of information about human balance performance, both in health and disease. Future studies should no longer discard FTRs, but routinely include these in their analyses. Particular emphasis should be placed on the link between FTRs and everyday balance performance (including falls), and on the possible role played by startle reactions in triggering or modulating FTRs.     

NR3C1基因Bcl1多态性与青少年抑郁：压力性生活事件的调节作用

迄今,有关抑郁的基因×环境交互研究多数基于“单胺缺陷假说”,相对较少有研究以“HPA轴假说”为框架考察抑郁的遗传机制,且忽视了基因-环境相关的影响。本研究对1081名青少年进行追踪研究,考察NR3C1基因Bcl1多态性与压力性生活事件对抑郁的影响。结果发现,经历较多压力性事件时,C等位基因携带者的抑郁水平显著高于GG纯合子携带者;经历较少压力性事件时,不同基因型携带者的抑郁水平无差异。此外,通过区分独立性压力性事件和预测早期抑郁进一步排除了基因-环境相关的影响,在一定程度上验证了结果的可靠性。     

Moderation of the effects of discrimination-induced affective responses on health outcomes

Objective: The goal of the study was to examine differential mediation of long-term effects of discrimination on health behaviour and health status by internalising (anxiety and depression) and externalising (hostility and anger), and to explore moderation of these effects, specifically, by the presence of support networks and coping tendencies.

Design: The current analyses employed structural equation modelling of five waves of data from Black female participants of the Family and Community Health Study over 11 years (M age 37–48).

Main Outcomes Measures: The main outcome variables were health status and alcohol use (frequency and problematic consumption).

Results: Perceived racial discrimination was associated with increases in internalising and externalising. In addition, internalising reactions to discrimination were associated with deterioration in health status and increases in problematic drinking; externalising reactions were associated with increases in frequency of drinking. These relations were attenuated by availability of support networks, and exacerbated by use of avoidance coping.

Conclusion: The current study (a) replicated previous research suggesting that two different types of affective reactions mediate the relations between perceived racial discrimination and physical health status vs. health-impairing behaviours: internalising and externalising, and (b) revealed moderation of these effects by coping mechanisms.     

Ethical Problems in Planning for and Responses to Pandemic Influenza in Ghana and Malawi

Ethical problems are addressed in various ways within countries in planning for and response to pandemic influenza. Here we report on a qualitative study, in which 46 policymakers in Malawi and Ghana were interviewed on how they identified and resolved ethical problems. The study results revealed that ethical problems involving conflicts of values and choices were raised in reference to the extent and role of resources (inequities) and nature of public health interventions (intrusive measures), including the extent and processes of decision making, reasoning, and justification. There is a need for an ethical framework within pandemic preparedness plans to resolve and avert these problems.     

Cognitive bias modification as a strategy to reduce children's fears and concerns about the secondary school transition

Background and objectives: Cognitive Bias Modification of Interpretations (CBM-I) has emerged as an anxiety-reducing tool for children and adolescents, targeting maladaptive interpretations of everyday situations. This literature falls short of addressing whether the effects of CBM-I extend to worries about a real-life stressor, such as a school transition. Design: The study comprised a between-groups design comparing the effects of CBM-I to an active control (AC) intervention in children. Method: We recruited 38 children within two months of their primary–secondary school transition and investigated the capacity for multi-session, parent-administered CBM-I, compared to an AC condition, to modify cognitive style and reduce anxiety symptoms and school concerns. Results: While benign interpretations increased significantly and negative interpretations tended to decrease following CBM-I, both interventions significantly reduced anxiety symptoms and school concerns. Conclusions: These findings indicate that anxiety-reducing effects of CBM-I in children extend to a real life stressful event, but that equivalent anxiety reduction may be achieved through exposure to potentially worrying situations and parent–child interaction in the absence of bias modification.     

Concurrent nonindependent fixed‐ratio schedules of alcohol self‐administration: Effects of schedule size on choice

Choice behavior was studied under concurrent nonindependent fixed‐ratio fixed‐ratio (nFR) schedules of reinforcement, as these schedules result in frequent changeover responses. With these schedules, responses on either operandum count toward the completion of the ratio requirements of both schedules. Five monkeys were subjects, and two pairs of liquid reinforcers were concurrently available: 16% (w/v) and 0% ethanol or 16% and 8% ethanol. For each pair of reinforcers, the nFR sizes were systematically altered across sessions while keeping the schedule size equal for both liquids. Responding varied as a function of reinforcer pair and nFR size. With the 16% and 0% pair, higher response rates were maintained by 16% and were an inverted U‐shape function of nFR size. With 16% and 8%, a greater number of responses initially occurred on the schedule that delivered 8% ethanol. However, as nFR size increased, preference reversed such that responses that delivered 16% ethanol were greater. When the nFR size was subsequently decreased, preference reverted back to 8%. Number of responses emitted per delivery was a dependent variable and, in behavioral economic terms, was the price paid for each liquid delivery. With 16% and 0%, changeover responses initially increased and then decreased as schedule size became larger. In contrast, with the 16% and 8% pair, changeover responses increased directly with schedule size. Responding under nFR schedules is sensitive to differences in reinforcer magnitude and demonstrates that relative reinforcing effects can change as a function of schedule size.     

相对剥夺感:想得、应得、怨愤于未得

相对剥夺感是指与某一标准相比较,个体觉得自己或自己所在群体状况更加糟糕,并产生生气或怨恨的情感反应。相对剥夺感包括个人相对剥夺感和群体相对剥夺感。研究表明,家庭收入、主观社会阶层、内群体认同,以及社会变化的速度和方向等对个人或群体相对剥夺感产生显著影响。相对剥夺感对个体的身心健康和行为,以及群体的态度与行为均具有显著的影响。但是,有关相对剥夺感与公正理论的异同、相对剥夺感的测量、参照对象与比较方式,以及相对剥夺感影响心理与行为的机制等方面还有待深入探讨。     

Stressful life events and predictors of post-traumatic growth among high-risk early emerging adults

Stressful life events (SLEs) may elicit positive psychosocial change among youth, referred to as post-traumatic growth (PTG). We assessed types of SLEs experienced, degree to which participants reported PTG, and variables predicting PTG across 24 months among a sample of high-risk, ethnically diverse, early emerging adults. Participants were recruited from alternative high schools (n = 564; mean age = 16.8; 65% Hispanic). Multi-level regression models were constructed to examine the impact of environmental (SLE quantity, severity) and personal factors (hedonic ability, perceived stress, developmental stage, future time orientation) on a composite score of PTG. The majority of participants reported that positive changes resulted from their most life-altering SLE of the past two years. Predictors of PTG included fewer SLEs, less general stress, having a future time perspective, and greater identification with the developmental stage of emerging adulthood. Findings suggest intervention targets to foster positive adaptation among early emerging adults who experience frequent SLEs.