The multidimensional nature of the frontal lobes serves to organize and coordinate brain functioning, playing a central and pervasive role in human cognition. The organizational and strategic nature of frontal lobe functioning affects memory processes by enhancing the organization of to-be-remembered information. Among the specific memory systems presumed to be based on anterior cerebral structures is the temporal organization of memory. An essential component of memory that involves temporal organization is sequential ordering. The acquisition of abilities thought to be mediated by the frontal lobes, including sequential memory, unfolds throughout childhood, serving to condition patterns of behavior for the rest of the brain. Development of the frontal regions of the brain is known to continue through late adolescence and into early adulthood, in contrast to the earlier maturation of other cortical regions. The purpose of the present study was to evaluate the development of sequential memory and to compare such findings to what currently is known regarding the development of frontal lobe functioning. Through an analysis of the previously collected standardization data of the Test of Memory and Learning (TOMAL; Reynolds & Bigler, 1994), a developmental function depicting the maturational process of sequential memory was derived. This model was then compared to an overall representative model of frontal lobe functioning. Results indicated a staging of development that begins in early childhood with the maturation of sequential memory continuing, although at a decreased rate, into early adolescence. The greatest period of development in sequential memory was evident between 5 and 8 years of age. The rate of development then decreased, and a continued deceleration of maturation continued throughout the age span examined. Gender was not found to be a significant predictor of developmental performance on sequential memory tasks. The results of the present study are consistent with previous findings that have suggested that the development of frontal functions occurs in a step-wise fashion with greatest period of development in frontal lobe functioning occurring at the 6- and 8-year old levels, with more moderate effects between the ages of 9 and 12 and performance approximating adult levels during adolescence.

The goals of this study were to evaluate the relationships among family functioning, psychological adjustment, and health-related quality of life in children with asthma and children with diabetes. A secondary goal of this study was to examine the relations between illness severity, psychological adjustment, and health-related quality of life in the children with asthma. Participants included 41 children with asthma and 109 children with diabetes, and one primary caregiver of each child. Questionnaires were given to children to assess their levels of anxiety, depression, and health-related quality of life. Questionnaires pertaining to parenting stress, family functioning, and psychological adjustment also were completed by the participating primary caregiver. Results suggested these two groups of children do not differ in their psychological adjustment, family functioning, or health-related quality of life. Normal levels of anxiety and depression were reported, which both supports and contradicts current research in this area. Additionally, parenting stress mediated the relationship between family cohesion and parent-reported depression in children with diabetes; however, this result was not obtained in the children with asthma. In children with diabetes, significant relationships were found between self-reported anxiety and parenting stress and between parent-reported anxiety and health-related quality of life. Additionally, parent-reported depression was significantly related to parenting stress, health-related quality of life, and family cohesion. Self-reported depression was significantly predicted by health-related quality of life. In children with asthma, health-related quality of life significantly predicted self-reported anxiety and parenting stress was significantly related to parentreported depression. Illness severity did not predict psychological adjustment or healthrelated quality of life in children with asthma.

Video gaming has become a major pastime in modern life, and it continues to accelerate in popularity. A recent wave of psychological research has demonstrated that core perceptual changes coincide with video game play. Video games incorporate highly complex and immersive experiences which invoke a range of psychological mechanisms. This complexity has led to intractability which precludes determining which specific attributes of video gaming lead to cognitive change. The current work represents a research initiative which uses real-time strategy (RTS) games to boost executive functioning. In order to establish a link between video game features, video game behavior, and cognitive changes, an attention-switching tests two different forms of the same RTS game. Additionally, a difficulty titration paradigm attenuates individual differences in gaming skill. Thus, this project represents a critical advancement over prior research in that aspects of the video game itself were controlled and used to experimentally examine resulting cognitive change. Participants completed a psychological task battery before and after video game training, as well as at a mid-test. The battery covered a range of cognitive abilities including long-term memory, working memory, several attention-related constructs, risk taking, visual search, task switching and multitasking. These tasks were divided into two groups depending on the level of executive functioning components associated with the task performance. This resulted in a group of executive tasks and a group of other tasks. Because the high-switching gaming condition involves control and maintenance over a larger spread of gaming situations, performance on the executive task cluster was expected to improve more for this condition relative to the low-switching gaming condition. To reduce the impact of practice effects and the peripheral aspects of video gaming in interpreting the results, the Sims group was used a control baseline. A meta-analytical Bayes factor technique was used to determine the strength of performance changes from pre-test to mid-test, post-test, and follow up. By post-test, there was evidence that RTS training in the high attention-switching condition had improved on executive functioning tasks but not on other tasks. These results provide further evidence that video game training leads to psychological benefits over time. / text

The purpose of this dissertation was to examine the connection between emotional trauma and executive function ability in children and adolescents. Trauma is defined as an overwhelming event that is beyond the realm of what might be an expectable occurrence for the average person. A serious outcome, occurring in around 14% of those children who experience trauma, is the development of Post Traumatic Stress Disorder, which is classified as an anxiety disorder occurring after exposure to a traumatic event, in which symptoms of re-experiencing, avoidance, and arousal are present. In addition to the numerous physical, emotional, and social effects of trauma, neuropsychological and imaging research has confirmed that children’s neuroanatomy and cognitive functioning are often affected. It has been proposed that intrusive thoughts occurring immediately after the trauma event may modify the neural network function, setting the stage for neurobiological dysregulation. One of the most common neural anatomic areas of concern following trauma is the prefrontal cortex, a structure that continues to develop until the third decade of life, and that has been implicated as the home of executive function, an idea conceptualized in a number of ways, but that is most often considered an umbrella term describing essential functions of the mind, such as planning, inhibition, attention, and working memory. The scope of literature addressing the effect of trauma on executive function is minimal. It is the hypothesis of this study that early trauma may disrupt the normal development of the PFC and subsequently result in decreased executive functioning abilities. In order to explore this hypothesis, a set of neuropsychological measures were selected as representative of executive functioning, based on previous research. An initial factor analysis was conducted in order to determine if, as suspected, all subtests chosen load on a common factor of executive function. Multiple linear regression was used to determine whether children who experienced trauma have impaired executive functioning abilities, if there was a significant gender difference, and what, if any, differences there were between children who developed PTSD and children who did not. / text

Differential Item Functioning (DIF) occurs when examinees with the same ability have different probabilities of endorsing an item. Conventional DIF detection methods (e.g., the Mantel-Hansel test) can be used to detect DIF only across observed groups, such as gender or ethnicity. However, research has found that DIF is not typically fully explained by an observed variable (e.g., Cohen & Bolt, 2005). True source of DIF may be unobserved, including variables such as personality, response patterns, or unmeasured background variables. The Factor Mixture Model (FMM) is designed to detect unobserved sources of heterogeneity in factor structures, and an FMM with binary outcomes has recently been used for assessing DIF (DeMars & Lau, 2011; Jackman, 2010). However, FMMs with binary outcomes for detecting DIF have not been thoroughly explored to investigate both types of between-class latent DIF (LDIF) and class-specific observed DIF (ODIF). The present simulation study was designed to investigate whether models correctly specified in terms of LDIF and/or ODIF influence the performance of model fit indices (AIC, BIC, aBIC, and CAIC) and entropy, as compared to models incorrectly specified in terms of either LDIF or ODIF. In addition, the present study examined the recovery of item difficulty parameters and investigated the proportion of replications in which items were correctly or incorrectly identified as displaying DIF, by manipulating DIF effect size and latent class probability. For each simulation condition, two latent classes of 27 item responses were generated to fit a one parameter logistic model with items’ difficulties generated to exhibit DIF across the classes and/or the observed groups. Results showed that FMMs with binary outcomes performed well in terms of fit indices, entropy, DIF detection, and recovery of large DIF effects. When class probabilities were unequal with small DIF effects, performance decreased for fit indices, power, and the recovery of DIF effects compared to equal class probability conditions. Inflated Type I errors were found for invariant DIF items across simulation conditions. When data were generated to fit a model having ODIF but estimated LDIF, specifying LDIF in the model fully captured ODIF effects when DIF effect sizes were large. / text

Evidence from the pediatric traumatic brain injury and pediatric brain tumor populations suggests that positive family functioning serves as a protective factor for neurocognitive outcomes of children who survive these conditions. However, no research has been found that examines whether positive family functioning similarly moderates the effects of CNS-directed chemotherapy on the neurocognitive functioning of survivors of pediatric ALL. The purpose of this study is to examine the effect of family functioning upon neurocognitive outcome among survivors of pediatric ALL treated with chemotherapy. Based upon a multidimensional model of attention and Anderson’s model of executive function (EF), four subcomponents of attention (selective, divided, sustained, and shifting) and four subcomponents of EF (working memory, planning, inhibition, and processing speed) will be examined. Sequential, or hierarchical, multiple regression analyses will be conducted to examine the relationship between family functioning and neurocognitive functioning among survivors of pediatric ALL as well as a comparison group of healthy children. Data for the ALL group and the comparison group will be examined using separate analyses, with demographic and treatment-related variables entered first, followed by a family functioning variable. For the ALL group, family functioning is expected to explain a significant amount of variance in neurocognitive outcome, even after controlling for demographic and treatment-related variables. It is expected that this relationship will not be found for the comparison group. If so, this would have important implications for the survivors and their families. For example, survivors from families with lower levels of functioning could be identified early through screening measures and their families could receive targeted interventions aimed at improving family functioning and thus survivor outcomes. / text

The current study explored the nuanced associations between components of executive functioning (EF) and subtypes of aggression, using a latent variable approach. Participants were racially diverse undergraduate students who completed a self-report of reactive (RA) and proactive aggression (PA), and traditional neuropsychological tasks of EF. The appropriateness of using a nested bifactor model of EF was confirmed, and this bifactor model of EF was used to examine the specific associations between components of EF and RA and PA. Results revealed components of EF are differentially associated with RA and PA, such that impulsive, provoked aggression is associated with lower levels of goal-oriented inhibition and higher levels of flexibility, whereas planned, goal-oriented aggression is associated with higher levels of working memory. Findings from the current study underscore the importance of considering the multidimensional nature of EF as well as aggression when examining their associations with external constructs of interest.

Recent conceptualizations of procrastination suggest that procrastination is akin to self-regulatory failure wherein the effect of good intentions is attenuated for individuals who tend to procrastinate. Some researchers speculate that this effect is due to subtle neurological deficits that make it more difficult for procrastinators to follow through with completing tasks. The present work examines this claim while also investigating two factors that should theoretically weaken the effect of intentions for engaging unpleasant, but important, tasks – namely habitual avoidance and the executive function of inhibition. Study 1 investigated the question of whether chronic avoidance patterns may become so entrenched that they take on the qualities of a habit. This is important because habits are known to be less reliant on intentions because they are triggered in a relatively automatic fashion. Habit indices were created which assessed the degree to which the experience of avoiding particular tasks was automatic and self-descriptive in nature (Verplanken & Orbell, 2003). The results confirmed the expectation that more frequent avoidance patterns are experienced as occurring relatively automatically. Habit-like avoidance can be measured reliably and is related to other constructs in expected ways. For example, habit-level predicts reduced task quality and lower rates of task completion above-and-beyond motivational variables (e.g. intentions). Finally, habit-like avoidance patterns were more often associated with stable features identified by participants as being present in the environment. Using a prospective design, Study 2 assessed the degree to which existing habitual-avoidance patterns weakened the effect of good intentions to carry out unpleasant tasks over the course of a week. Several computer tasks at Time 1 were also used to assess inhibitory control or the degree to which participants could inhibit prepotent responses. In addition to personality traits which purportedly moderate the intention-behaviour relation (e.g. trait procrastination), the moderating effects of habitual avoidance and inhibitory control were also tested. Trait-level procrastination did not weaken the effect of one’s intentions to carry out unpleasant tasks. However, habitual avoidance and inhibitory control jointly moderated the effect of intentions on behaviour such that poor inhibitors had difficulty overcoming previous avoidance habits in order to complete unpleasant tasks during the week. In contrast, good inhibitors were able to behave according to their intentions irrespective of habit-like avoidance patterns. These findings point to the importance of recognizing the joint influence of avoidance patterns and regulatory capacities involved in self-control when understanding procrastination behaviour.

In this study I first examined whether the cognitive processes (hot versus cold cognition) underlying judgments to traditional moral situations are universal to situations that are morally neutral, and whether individual differences in cognitive ability moderate these judgments. Second, I tested whether it was possible to modify the impact of hot versus cold processing systems on judgment deliberation by shifting the focus of attention during the decision-making process. I conclude that moral judgment is not simply the product of cognitive ability and is not sufficiently motivated by hot cognitive experiences alone. The role of cognitive abilities on moral valuation requires further examination.

There is a robust body of research regarding outcomes following pediatric acquired brain injury (ABI). However, these studies generally explore medium-term outcomes (i.e., 3 to 12-months postinjury), whereas functioning during acute stages following ABI is poorly understood. In particular, there is limited knowledge regarding caregiver functioning during a child’s hospitalization immediately after ABI. This study sought to identify and model caregiver and child predictors of ‘caregiver confidence’ in caring for their hospitalized child. Caregivers of 45 children with diverse types of new-onset acquired brain injuries completed self-report measures of their own psychological functioning, stress, and confidence levels, as well as their perceptions of their child’s stress and coping. Results showed that caregiver psychological functioning was negatively associated with caregiver confidence, and caregiver perceptions of child coping were positively associated with caregiver confidence. Child functional status did not serve as a significant mediator in this relationship as per the hypothesized model.