The goal of the current study was to test whether deficits in processing speed (PS) may be a shared cognitive risk factor in reading disability (RD) and Attention Deficit/Hyperactivity Disorder (ADHD), which are known to be comorbid. Literature on ADHD and RD suggests that deficits on tasks with a speeded component are seen in both of these disorders individually. The current study examined a wide range of speeded tasks in RD, ADHD, comorbid RD+ADHD, and a control group to test whether RD and ADHD have similar profiles of PS deficits, and whether these deficits are shared by the two disorders. The results suggest that a general PS deficit exists in both clinical groups compared to controls, although children with RD demonstrate greater PS deficits than children with ADHD. Two tests (underadditivity and partial correlations) were conducted to test whether these PS deficits are shared. Since we found that PS deficits were underadditive in the comorbid group and that partialling PS reduced the correlation between RD and ADHD, it appears that PS is a shared cognitive risk factor that may help explain the comorbidity of these two disorders.

Background-This study tests a multiple cognitive deficit model of Reading Disability (RD), Attention-Deficit/Hyperactivity Disorder (ADHD), and their comorbidity.

The primary goal of this study was to test three competing theories of ADHD: the inhibition theory, the motivational theory, and a dual deficit theory. Previous studies have produced conflicting findings about the effects of incentives on executive processes in ADHD. In the present study of 25 children with ADHD and 30 typically developing controls, motivation was manipulated within the Stop Task. Stop signal reaction time was examined, as well as reaction time, its variability, and the number of errors in the primary choice reaction time task. Overall, the pattern of results supported the inhibition theory over the motivational or dual deficit hypotheses, as main effects of group were found for most key variables (ADHD group was worse), whereas the group by reward interaction predicted by the motivational and dual deficit accounts was not found. Hence, as predicted by the inhibition theory, children with ADHD performed worse than controls irrespective of incentives.

Women exposed to violence early in life are at risk of revictimization. The interpersonal schema hypothesis of revictimization proposes that revictimized women will be more likely to hold negative expectations about intimate relationships, including expectations that relationships involve harm, relative to singly or nonvictimized women. To test the interpersonal schema hypothesis, we used the implicit lexical decision task to examine automatic associations between relationship and harm concepts among college women who reported histories of no, single, or multiple types of interpersonal trauma involving close others (e.g., family member, partner). Women exposed to multiple types of interpersonal trauma involving close others showed stronger relationship-harm associations than singly or nonexposed women. Relationship-harm associations predicted the number of interpersonal trauma types (e.g., sexual, physical trauma) involving close others reported by participants, but were unrelated to posttraumatic stress disorder (PTSD) symptoms. Findings suggest that relational schemata held by women exposed to multiple types of interpersonal trauma involving close others include concepts of harm, which may have implications for how multiply victimized women behave in and think about intimate relationships.

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