Examination of the influence of contingency on changes in reinforcer value

This study examined how the amount of effort required to produce a reinforcer influenced subsequent preference for, and strength of, that reinforcer in 7 individuals with intellectual disabilities. Preference assessments identified four moderately preferred stimuli for each participant, and progressive-ratio (PR) analyses indexed reinforcer strength. Stimuli were then assigned to one of four conditions for 4 weeks: fixed-ratio (FR) 1 schedule, escalating FR schedule, yoked noncontingent (NCR) delivery, and restricted access. Preference assessments and PR schedules were then repeated to examine changes in selection percentages and PR break points. Selection percentages decreased for all NCR stimuli but increased for most of the restricted stimuli. There were no systematic changes in selection percentages for either of the contingent stimuli. Break points increased, on average, for all conditions, but the increase was highest for the restricted stimuli and lowest for the NCR stimuli. These results are discussed in relation to recent basic research addressing the influence of effort on stimulus value.     

Evidence of construct validity for work values

Despite the importance of work values in the process of career adjustment (Dawis, 2002), little empirical research has focused on articulating the domains represented within the construct of work values and the examination of evidence of validity for the construct has been limited. Furthermore, the larger number of work values measures has made it difficult to determine the key domains that constitute the construct. The current study sought to examine multiple measures of work values to understand domains represented within the construct of work values and to establish evidence of validity for these domains. Principal Components Analysis utilizing scores on the Minnesota Importance Questionnaire (Rounds, Henley, Dawis, Lofquist, & Weiss, 1981), the revised edition of Super's Work Values Inventory (SWVI-R; Zytowski, 2006), and Manhardt's Work Values Inventory (Manhardt, 1972) found that six components best explained the data. These components reflected the importance of: the working environment, having challenging work, opportunities for status and income, autonomy, organizational support, and relationships. Implications for research and practice are discussed.     

Accuracy of Effect Size Estimates From Published Psychological Experiments Involving Multiple Trials

The reporting of exaggerated effect size estimates may occur either through researchers accepting statistically significant results when power is inadequate and/or from repeated measures approaches aggregating, averaging multiple items, or multiple trials. Monte-Carlo simulations with input of a small, medium, or large effect size were conducted on multiple items or trials that were either averaged or aggregated to create a single dependent measure. Alpha was set at the .05 level, and the trials were assessed over item or trial correlations ranging from 0 to 1. Simulations showed a large increase in observed effect size averages and the power to accept these estimates as statistically significant increased over numbers of trials or items. Overestimation effects were mitigated as correlations between trials increased but still remained substantial in some cases. The implications of these findings for meta-analyses and different research scenarios are discussed.     

An assessment of antecedent events influencing noncompliance in an outpatient clinic

Several studies have shown that various factors can influence noncompliance, including task novelty, rate of presentation, and task preference. This study examined the impact of selected antecedent variables on noncompliance in an outpatient clinic setting. In two experiments involving 6 typically developing children, the consequences for noncompliance remained constant. During Experiment 1, demands that included noncontingent access to adult attention were contrasted with the same demands that did not include attention within a multielement design. In Experiment 2, demands were altered by decreasing the difficulty or amount of work or providing access to attention. In both experiments, results indicated idiosyncratic responses to the manipulated variables, with decreases in noncompliance observed following introduction of one or more antecedent variables with 5 of the 6 participants. These results suggested that noncompliance can be reduced via changes in antecedent variables, including adding potential positive reinforcers to the task situation, and that it is possible to probe variables that alter noncompliance in an outpatient clinic setting.     

Cross-national applicability of a game-based cognitive assessment

New technology has had a discernable impact on how organizations recruit and select potential employees. Game-based assessment has emerged as a potential technology that can be used to enhance the assessment of individual differences and applicants' views of the selection process. However, studies investigating the psychometric properties and predictive validity of game-based assessments are still lacking. This study investigated the structural equivalence of a game-based assessment of cognitive ability across 228 Australians and 239 South Africans. A smaller sample of 115 South Africans also received work performance ratings to investigate the predictive validity of the cognitive assessment. Results of factor analysis supported a strong general factor of cognitive ability across the entire sample but only partial metric and scalar invariance across the two nations. The general factor of the game-based assessment further revealed promising results in terms of its predictive validity for five broad dimensions of individual work performance.     

Issues associated with repeated neuropsychological assessments

Distinguishing practice effects from other factors in repeated neuropsychological assessments are discussed in the context of research studies and clinical/forensic assessments. Potential methodological procedures for reducing the impact of practice effects in research settings are outlined. In contrast, the potential clinical utility and interpretation of practice effects in clinical assessments and forensic evaluations are highlighted.     

The use of decomposition in probability assessments of continuous variables

In this study, decomposition is used as a tool for the assessment of continuous probability distributions. The goal of using decomposition is to obtain better calibrated probability distributions by expressing a variable as a known function of several component variables. Three target quantities were used in the study. Each was assessed holistically and using two different decompositions. Thus, each subject provided three distributions for each of the three target quantities. The recomposed assessments were compared to holistic assessments. The distributions obtained using decomposition were found to be much better calibrated than those obtained holistically. Two methods of aggregating distributions from multiple subjects were also examined. One involves aggregating (averaging) distributions before recomposing while the second method involves recomposing and then averaging distributions for the target variable. The second method was found to be slightly better, although both showed better calibration than was found in the individual assessments.     

Utopias and Comparative Assessments of Justice

When we make public policy choices, is it helpful to know how utopia (that is, the perfectly just institutional design) would look? Amartya Sen argues that it is neither necessary, nor sufficient, nor even contributory. He claims that before making a policy choice one should compare several feasible institutional designs to see which promotes justice most (a “comparative assessment” of justice), and that it is misleading to use the perfect design as a standard in those comparisons. Principles of justice are the proper standard. The present article contends that the perfect design has nevertheless an important role to play in the prior task of identifying and refining our principles of justice. It also shows that the perfect design—in at least one sense of this term—may be a legitimate long‐term goal for present policy choices.     

Assessing Proprioception in Children: A Review

Proprioception is the subconscious and conscious awareness of the spatial and mechanical status of the musculoskeletal framework. When working with children with motor delays and sensory integrative dysfunction, occupational therapists routinely assess the client's proprioceptive system. However, currently available assessments for occupational therapists are primarily observer-based and concerns have been raised about the reliability of observer-based assessments of sensation. The author's purpose was to review measures of proprioception currently available to occupational therapists and explore direct measures of proprioception from neuroscience and rehabilitation that can be adapted for pediatric clinical use. Observer-based and direct measurements of proprioception assessments complement each other in meeting clinical needs. A better understanding of both types of evaluation will improve proprioceptive evaluation.