Statistically significant reductions in scores from initial pretreatment testing to subsequent pretreatment testing in self-report measures are a widespread phenomenon (Arrindell, 2001). If valid, these reductions reflect improvement in psychological functioning absent any formal treatment (Arrindell, 2001). Many explanations for these reductions in scores have been offered (Arrindell, 2001) including assessment reactivity (Epstein et al., 2005), social desirability (Henderson, Byrne, & Duncan-Jones, 1981); and mechanical responding (Bromet, Dunn, Connell, Dew, & Schulberg, 1986; Durham et al., 2002). However, relatively few studies have examined this phenomenon empirically. Even fewer studies have examined pretreatment improvements in parent ratings. The present study sought to replicate the pre-treatment effect and to evaluate potential causes of these changes, specifically, repeated assessment, social desirability, and mechanical responding. Additionally, the study examined the relationship between maternal depression and parent ratings. Participants included 28 self-referred mothers and their children, though only 17 completed the study in its entirety. Results indicated pretreatment reductions in maternal ratings of child symptomatology and parenting stress. Repeated assessment was not supported as a cause of pretreatment improvements (score reductions). Social desirability, however, may have been a factor in the mothers’ ratings. Mechanical responding did not appear as a likely cause. Maternal symptoms of depression were associated with less change over the course of the study. Clinical implications, study limitations, and suggestions for future research are discussed.

This dissertation aimed to investigate the utility of the ex-Gaussian approach to estimating intraindividual variability (IIV) of response times (RT) in diagnosing attention deficit/hyperactivity disorder (ADHD) in children ages 6 to 13 years old. Higher IIV is consistently noted in children with ADHD, but also with other disorders commonly associated with impairments in attention. Firstly, the relationship between IIV and attention abilities was investigated both in relation to parent ratings and participants’ objective performance. Secondly, IIVs utility as an objective measure for supplementing behavioural ratings in the diagnosis of ADHD, a diagnosis which is currently primarily assigned based on informant interviews and ratings of attention, was assessed. Participants included 46 children with ADHD and 58 children without ADHD. Children completed computerized tasks to estimate IIV and assess inattention and hyperactivity/impulsivity. Parents completed questionnaires aimed at assessing attention and hyperactive/impulsive behaviours of participants. Analyses revealed that IIV was predictive of parent ratings of inattention and hyperactivity/impulsivity as well as the number of omission errors made by participants. Regarding diagnostic utility, IIV significantly predicted group membership (ADHD vs Control). However, IIV did not improve diagnostic accuracy when parent ratings were used, such that parent ratings were superior at determining diagnosis. Overall, current results support the use of IIV, based on the ex-Gaussian approach, as an objective measure of attention problems such that it appears to be superior to omission errors on sustained attention CPT-type tasks. Additionally, while parent ratings of attention impairment remain the best predictor of ADHD diagnostic status, IIV may be helpful in determining when further assessment is required in the absence of those ratings. / Graduate / 2021-06-17

Parent-child interaction could arguably be the most important factor in child development, including academic achievement, behavior, and personality. This study suggests that the quantity of parent-child interaction is just as important as quality, and we test the reliability and validity of our instrument developed to quantitatively measure parent-child interaction in the home under realistic conditions. Twenty-eight children’s parents participated in the study over four days. Eight families had two research observers complete the instrument simultaneously with them, and reliability measures were taken between parents (74%), parent and one research-observers (78%), and two research observers (97%). Validity measures yielded scores of 78% for parents and 77% for colleagues. This study’s instrument was shown to be a simple and strongly reliable instrument for measuring children’s after-school activities and a reliable way to measure parent-child interactions indirectly, avoiding a social desirability response set.

This study investigated if girls and boys high in ADHD symptomology exhibited and experienced relational and overt aggression differently than boys and girls without ADHD symptoms using peer, parent and teacher ratings. A measurement of social behavior for parent ratings was also validated. Using archival data, 371 3rd- 6th graders from a north Texas school district participated in the study, along with a parent or guardian and teachers. Results supported that ADHD subtype predicted more overt aggression according to parents and teachers but not peers. ADHD subtype did not predict more relational aggression but ADHD symptomology did. Contrary to past research, gender did not moderate relational aggression or internalizing symptoms from relational victimization. Furthermore, a parent version of the Child Social Behavior Scale was found to effectively measure relational, overt and prosocial behavior. Limitations, future directions and implications are discussed.