Neurocognitive function in monozygotic twins discordant for combat exposure: relationship to posttraumatic stress disorder

Neuropsychological deficits have been reported among trauma survivors with posttraumatic stress disorder (PTSD). It is often assumed that these cognitive difficulties are toxic consequences of trauma exposure. Alternatively, they may reflect preexisting characteristics that contribute to the likelihood of developing PTSD. To address this possibility, the authors evaluated cognitive performance in monozygotic twin pairs who were discordant for combat exposure. Pairs were grouped according to whether the combat-exposed brother developed PTSD. The combat-unexposed cotwins of combat veterans with PTSD largely displayed the same performance as their brothers, which was significantly lower than that of non-PTSD combat veterans and their brothers. The results support the notion that specific domains of cognitive function may serve as premorbid risk or protective factors in PTSD.     

Not quite as grown-up as we like to think: parallels between cognition in childhood and adulthood

Greater continuity in cognition between children and adults may exist than is usually appreciated. It was thought that after 3 to 4 years of age, the problem in switching on the dimensional-change card-sort task disappears. We show here, however, that if speed is used as the dependent measure, the effect of the first dimension is evident even in adults. Adults, like preschoolers, show difficulty in switching from a block of sorting by color or shape to a block of sorting by the other dimension. Notably, performance throughout the session was affected by the first dimension by which stimuli were sorted. We hypothesize that perhaps adults never fully outgrow any of the cognitive and perceptual biases of infancy and early childhood. Other examples of such biases that appear to still be present in adults are discussed. Conversely, the assumption that the optimal dependent measure for adults is the most sensitive measure for children is questioned.     

When more is less: failure to compress discourse with re-telling in normal ageing

When young adults tell the same story repeatedly, their narratives become progressively more concise. Although impaired discourse production has been reliably demonstrated in the elderly, changes in narrative production with repetition have not been investigated in this cohort. Thirty young (aged 18-49 years, M=28.77, SD=9.73) and thirty elderly (aged 65+ years, M=73.57, SD=6.80) adults completed a discourse production task involving narrative construction using an eight-frame cartoon. Narratives were repeated 4 consecutive times. Variables analysed were narrative duration, word count and fluency (words/sec). For all variables the compression index for the elderly group was significantly lower than that for young participants. Further, compared to their younger counterparts, elderly adults were less able to improve the cohesion of their narratives with repetition. These findings suggest that the elderly have a reduced capacity to generate and refine discourse representations.     

eDom: Norming software and relative meaning frequencies for 544 English homonyms

Words that are homonyms??that is, for which a single written and spoken form is associated with multiple, unrelated interpretations, such as COMPOUND, which can denote an <?enclosure?> or a <?composite?> meaning??are an invaluable class of items for studying word and discourse comprehension. When using homonyms as stimuli, it is critical to control for the relative frequencies of each interpretation, because this variable can drastically alter the empirical effects of homonymy. Currently, the standard method for estimating these frequencies is based on the classification of free associates generated for a homonym, but this approach is both assumption-laden and resource-demanding. Here, we outline an alternative norming methodology based on explicit ratings of the relative meaning frequencies of dictionary definitions. To evaluate this method, we collected and analyzed data in a norming study involving 544 English homonyms, using the eDom norming software that we developed for this purpose. Dictionary definitions were generally sufficient to exhaustively cover word meanings, and the methods converged on stable norms with fewer data and less effort on the part of the experimenter. The predictive validity of the norms was demonstrated in analyses of lexical decision data from the English Lexicon Project (Balota et al., Behavior Research Methods, 39, 445?C459, 2007), and from Armstrong and Plaut (Proceedings of the 33rd Annual Meeting of the Cognitive Science Society, 2223?C2228, 2011). On the basis of these results, our norming method obviates relying on the unsubstantiated assumptions involved in estimating relative meaning frequencies on the basis of classification of free associates. Additional details of the norming procedure, the meaning frequency norms, and the source code, standalone binaries, and user manual for the software are available at http://edom.cnbc.cmu.edu.     

African American, White and Latino Fathers’ Activities with their Sons and Daughters in Early Childhood

We examined the activities that low-income, ethnically diverse fathers of sons versus daughters engage in with their children in the preschool years. African American, Latino, and White fathers (N?=?426) from research sites across the United States, were interviewed about their caregiving, play, literacy, and visiting activities when their children were 2?years, 3?years, and preschool age. Fathers of boys engaged more frequently in physical play than fathers of girls, whereas fathers of girls engaged more frequently in literacy activities. Moreover, gendered patterns of father engagement were already evident at the 2-year assessment, suggesting that fathers channel their children toward gender-typed activities well before their children have a clear understanding of gender roles. Ethnic differences were also found in fathers’ activities with children, and child gender moderated ethnic patterns of behavior. For example, Black fathers of sons reported the highest levels of engagement in caregiving, play and visiting activities, and both Latino and African American fathers of sons engaged in more visiting activities compared to White fathers of sons. Fathers’ education and marital status were also associated with fathers’ activities. Married fathers and those with a high school diploma more frequently engaged in literacy activities than unmarried fathers without a diploma; moreover, although Latino fathers engaged less in caregiving activities than African American and White fathers, this difference attenuated after controlling for differences in fathers’ education. The activities children share with their fathers vary by child gender, race/ethnicity, and family circumstances and offer insight into early gendered experiences in the family.     

From a single-level analysis to a multilevel analysis of single-case experimental designs

Multilevel modeling provides one approach to synthesizing single-case experimental design data. In this study, we present the multilevel model (the two-level and the three-level models) for summarizing single-case results over cases, over studies, or both. In addition to the basic multilevel models, we elaborate on several plausible alternative models. We apply the proposed models to real datasets and investigate to what extent the estimated treatment effect is dependent on the modeling specifications and the underlying assumptions. By considering a range of plausible models and assumptions, researchers can determine the degree to which the effect estimates and conclusions are sensitive to the specific assumptions made. If the same conclusions are reached across a range of plausible assumptions, confidence in the conclusions can be enhanced. We advise researchers not to focus on one model but conduct multiple plausible multilevel analyses and investigate whether the results depend on the modeling options.     

A Defense of Partisan-Science: An Assessment of Stenmark's Non-Partisan Science3

Abstract

In his influential book “How to Relate Science and Religion,” Mikael Stenmark argues for the legitimateness of what he calls “partisan science”: “science that is aligned with or supports a particular ideology, religion, or worldview over another.” However, he maintains that we should make an exception: the justification phase of science (phase 3) requires neutral science. Thus, he argues for “non-partisan science₃.” In this article, I assess his arguments for non-partisan science₃. I find them wanting and I will argue for partisan science₃ and maintain that we should adhere to “Augustinian” or “theistic science.”     

Evaluation of a School-Based Social Skills Program for Children With Attention-Deficit/Hyperactivity Disorder

Attention-Deficit/Hyperactivity Disorder (ADHD) is prevalent among school-aged children. An associated feature of the disorder is a deficit in social functioning, which can be detrimental in terms of long-term outcomes. Therefore, it is crucial to identify evidence-based interventions which can improve the social skills of children with ADHD. The current study was an evaluation of a school-based social skills training program, called Working Together: Building Children's Social Skills Through Folk Literature. The modified version of the program with generalization enhancers was delivered in three schools to 16 children over a 10-week period. Results indicated that this program was effective for improving social skills in children with ADHD, particularly for children with poor pragmatic language skills.