Planning Beyond the Next Trial in Adaptive Experiments: A Dynamic Programming Approach

Experimentation is at the heart of scientific inquiry. In the behavioral and neural sciences, where only a limited number of observations can often be made, it is ideal to design an experiment that leads to the rapid accumulation of information about the phenomenon under study. Adaptive experimentation has the potential to accelerate scientific progress by maximizing inferential gain in such research settings. To date, most adaptive experiments have relied on myopic, one‐step‐ahead strategies in which the stimulus on each trial is selected to maximize inference on the next trial only. A lingering question in the field has been how much additional benefit would be gained by optimizing beyond the next trial. A range of technical challenges has prevented this important question from being addressed adequately. This study applies dynamic programming (DP), a technique applicable for such full‐horizon, “global” optimization, to model‐based perceptual threshold estimation, a domain that has been a major beneficiary of adaptive methods. The results provide insight into conditions that will benefit from optimizing beyond the next trial. Implications for the use of adaptive methods in cognitive science are discussed.     

The Work–Home Interface: Linking Work‐Related Wellbeing and Volunteer Work

An abundance of research shows the benefits of participation in volunteer work for individuals, employers and the society as a whole. However, relatively little is known about the precursors of volunteer work. In this study, we aim to fill this gap by investigating to what extent work‐related well‐being can function as a driver of volunteer work. Moreover, building on the Conservations of Resources Theory (Hobfoll, 1989 , 2011 ), we propose that the relationship between work‐related well‐being (burnout and engagement) and volunteer work is mediated by the work–home interface (work–home enrichment and work–home conflict). This hypothesis was tested in a large Swiss sample (N = 1947). Consistent with our expectations, structural equation analyses revealed an indirect relationship between (i) work engagement and volunteer work via work–home enrichment and (ii) between burnout and volunteer work via work–home conflict. In conclusion, it seems that well‐being at work indeed functions as a precursor for volunteer work because of the consequences it has for the work–family interface. Copyright © 2016 John Wiley & Sons, Ltd.     

When two paradigms meet: Does evaluative learning extinguish in differential fear conditioning?

Contemporary theories of Pavlovian conditioning propose a distinction between signal learning (SL), in which a conditioned stimulus (CS) becomes a predictor for a biologically significant unconditioned stimulus (US), and evaluative learning (EL), in which the valence of the US is transferred to the CS. This distinction is based largely on the different susceptibilities of EL and SL to extinction. This study compared the extinction of indices of EL (online valence ratings) and SL (US-expectancy ratings and skin conductance responses, SCRs) in a differential fear conditioning design using complex CSs. Only half of the participants gave online valence ratings, allowing us to confirm that online valence measurement did not influence SCRs. In line with the distinction between EL and SL, SCRs extinguished rapidly while valence ratings showed resistance to extinction. US-expectancy ratings, however, were not distinguishable from valence ratings indicating that verbal indicators of EL and SL share a similar time course.     

The association between retrospective outcome evaluations and pre-post-treatment changes in psychodynamic group-psychotherapy

In the present study of 203 patients in psychodynamic group psychotherapy, we explore associations between patient and therapist global retrospective outcome evaluations (ROE), and pre-post-treatment changes on the Symptom Check List 90 Revised (SCL-90-R) and non-symptomatic focus of therapy. There were no significant associations between ROE, diagnoses and demographic variables, and pre-treatment SCL-90-R associations were negligible (less than 4% of overlapping variance). SCL-90-R subscale improvement expressed as residual gain score explained the overall largest percent of variance in both patients and therapists (44% and 25%, respectively) when compared with raw difference scores (32% and 18%), and percent reduction from baseline (34% and 23%). Moreover, ROE/end-state adjustment associations were substantial (42% and 24%). Therapists' evaluation of change showed the strongest association with improvement in non-symptomatic focus of therapy, while patients' evaluation had the strongest association with improvement in SCL-Depression. It is concluded that retrospective evaluations reflect changes related to treatment. However, unexplained variance may be independent of symptomatic state, and associated with personality factors or domains not captured by standard questionnaires.     

Measurement invariance of personality traits from a five-factor model perspective: multi-group confirmatory factor analyses of the HP5 inventory

Associations between personality and health may be influenced by contextual factors varying across studied cohorts. Moreover, measurement bias related to contextual factors could also influence these associations. Gender and age have been discussed as important contextual factors when studying personality and health outcomes. An examination of measurement invariance across gender and age may therefore be warranted. In the present study, measurement invariance across age and gender was examined for a five-factor model of personality traits in which scales have been included to operationalise lower-order traits related to health-behaviour or health outcomes. Using multi-group confirmatory factor analysis on a population based cohort (n= 5700), all important parameters of the measurement model were found to be invariant. On the basis of this invariant model, hypotheses of mean differences across age and gender in personality traits were tested. These results were discussed in relation to meta-analyses on personality change and gender differences in personality.     

A taxonomy for scenes

Tomkins [Tomkins, S. (1979). Script theory: Differential magnification of affects. In: C. Keasey (Ed.), Nebraska Symposium on Motivation, Vol. 26 (pp. 201–236). Lincoln: University of Nebraska Press; Tomkins, S. (1987). Script theory. In: J. Aronoff, A. Rabin, & R. Zucker (Eds.), The Emergence of Personality (pp. 147–216). New York: Springer] proposed that personality is built from the experience of scenes, which minimally consist of an emotion and an event evoking that emotion. This study sought to identify a taxonomy of emotion-eliciting events. Examples of specific events eliciting love, joy, sadness, anger, and fear were collected from 200 participants, another 120 participants independently sorted these examples for similarity, and a hierarchical cluster analysis was run on these similarity sorts. The resulting tree diagram displayed categories of events at varying levels of abstraction. Individual differences were found in the types of events offered for each of the five emotions.     

Work, family and life-course fit: Does control over work time matter?

This study moves from “work-family” to a multi-dimensional “life-course fit” construct (employees’ cognitive assessments of resources, resource deficits, and resource demands), using a combined work-family, demands-control and ecology of the life course framing. It examined (1) impacts of job and home ecological systems on fit dimensions, and (2) whether control over work time predicted and mediated life-course fit outcomes. Using cluster analysis of survey data on a sample of 917 white-collar employees from Best Buy headquarters, we identified four job ecologies (corresponding to the job demands-job control model) and five home ecologies (theorizing an analogous home demands-home control model). Job and home ecologies predicted fit dimensions in an additive, not interactive, fashion. Employees’ work-time control predicted every life-course fit dimension and partially mediated effects of job ecologies, organizational tenure, and job category.     

时间压力、个人相关性对不同类型框架下决策的影响

该文以178名大学生为被试,考察三种框架下,时间压力、个人相关性对决策及框架效应的影响。结果表明,风险选择框架中,时间压力大,被试思考点数目少,决策保守;但压力和相关性均没有对框架效应造成影响;判定框架下,相关性越高,思考点数目越多,越不易出现框架效应;决策与思考点数目基本保持一致。     

The measurement of body-image dissatisfaction–satisfaction: Is rating importance important?

Some researchers have argued that evaluative body image may be better assessed by measures that weight dissatisfaction–satisfaction ratings by their subjective importance to individuals. The Body Areas Satisfaction Scale (BASS) is a frequently used, standardized assessment of evaluative body image, albeit one that does not use differential item weights. This investigation, with 410 female and male college students, examined whether an importance-weighted revision of the BASS would have incremental validity relative to the original version in the prediction of multiple criterion variables. Results confirmed the reliability and validity of unweighted and weighted versions. However, the validity of weighted versions did not surpass that of the original BASS. The extremity of individuals’ satisfaction and dissatisfaction ratings appears inherently to reflect the importance placed on physical attributes for self-evaluation. Moderated regression analyses offered only weak support for the interaction of average satisfaction and average importance ratings beyond their main effects. The simpler, unweighted BASS is an acceptable assessment of evaluative body image.