Effects of methylphenidate and expectancy on ADHD children's performance, self-evaluations, persistence, and attributions on a cognitive task.

The effects of 0.3 mg/kg methylphenidate (MPH) and expectancy regarding medication on the performance and task persistence of 60 boys with attention deficit hyperactivity disorder (ADHD) were investigated. In a balanced-placebo design, boys in 4 groups (received placebo–drug crossed with told placebo–drug) completed the task in success and failure conditions. Medication improved participants' task persistence following failure. Participants' task performance was not affected by whether they thought they had received medication or placebo. Children made internal attributions for success and made external attributions for failure, regardless of medication or expectancy. These findings confirm previous reports that it is the pharmacological activity of MPH that affects ADHD children's self-evaluations and persistence. The results contradict anecdotal reports that MPH causes dysfunctional attributions and confirm previous studies showing that medication does not produce adverse effects on the causal attributions of children with ADHD. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Drug interactions in human neuropathic pain pharmacotherapy

The effects of 0.3 mg/kg methylphenidate (MPH) and expectancy regarding medication on the performance and task persistence of 60 boys with attention deficit hyperactivity disorder (ADHD) were investigated. In a balanced-placebo design, boys in 4 groups (received placebo/drug crossed with told placebo/drug) completed the task in success and failure conditions. Medication improved participants' task persistence following failure. Participants' task performance was not affected by whether they thought they had received medication or placebo. Children made internal attributions for success and made external attributions for failure, regardless of medication or expectancy. These findings confirm previous reports that it is the pharmacological activity of MPH that affects ADHD children's self-evaluations and persistence. The results contradict anecdotal reports that MPH causes dysfunctional attributions and confirm previous studies showing that medication does not produce adverse effects on the causal attributions of children with ADHD.     

Effects of methyphenidate and expectancy on children with ADHD: Behavior, academic performance, and attributions in a summer treatment program and regular classroom settings.

Pharmacological and expectancy effects of 0.3 mg/kg methylphenidate on the behavior and attributions of boys with attention-deficit/hyperactivity disorder were evaluated. In a within-subject, balanced-placebo design, 136 boys received 4 medication-expectancy conditions. Attributions for success and failure on a daily report card were gathered. Assessments took place within the setting of a summer treatment program and were repeated in boys' regular classrooms. Expectancy did not affect the boys' behavior; only active medication improved their behavior. Boys attributed their success to their effort and ability and attributed failure to task difficulty and the pill, regardless of medication and expectancy. Results were generally equivalent across the two settings; where there were differences, beneficial effects of medication were more apparent in the school setting. The findings were unaffected by individual difference factors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Methylphenidate and attributions in boys with attention-deficit hyperactivity disorder.

In Exp 1, 28 attention-deficit hyperactivity disorder (ADHD) boys underwent a double-blind, placebo-controlled medication assessment in a summer day-treatment program. Daily, boys were asked questions to assess their attributions for and evaluations of their behavior. Objective measures showed improved behavior with methylphenidate; however, boys tended to attribute their performance to effort rather than to medication, particularly when medicated. Exp 2 involved 38 ADHD boys the following summer and replicated the procedures in Exp 1, with the addition of a no-pill condition and a comparison of attributions for success and failure outcomes. Simply taking a pill (no-pill vs placebo comparison) did not show significant effects, whereas the results of Exp 1 were replicated with placebo–methylphenidate comparisons. Across drug conditions a self-enhancing attributional pattern was obtained; the majority of attributions for success were to ability or effort, whereas attributions for failure were to the pill or to counselors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Academic task persistence of normally achieving ADHD and control boys: Self-evaluations, and attributions.

The authors examined academic task persistence, pretask expectancies, self-evaluations, and attributions of boys with attention-dcficit/hyperactivity disorder (ADHD) as compared with control boys. Participants were 83 ADHD boys and 66 control boys, all normally achieving. Prior to the task, performance expectancies were assessed. After a success-failure manipulation with find-a-word puzzles, performance on subsequent trials, self-evaluations, and attributions were evaluated. Compared with controls, ADHD boys solved fewer test puzzles, quit working more often, and found fewer words on a generalization task. Consistent with these behavioral findings, research assistants rated ADHD boys as less effortful and less cooperative than control boys. Although ADHD boys did not differ significantly from controls in their posttask self-evaluations, they did differ significantly from controls in some aspects of their attributions. Attributional data indicated that ADHD boys endorsed luck as a reason for success more strongly and lack of effort as a reason for failure less strongly than controls. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of methylphenidate on complex cognitive processing in attention-deficit hyperactivity disorder.

Three experiments were conducted to explore the effects of methylphenidate (MPH), attention-deficit hyperactivity disorder (ADHD) diagnosis, and age on performance on a complex visual-memory search task. Results showed that the effects of MPH varied with information load. On low-processing loads, all doses of MPH helped children with ADHD to improve accuracy with no cost to reaction time (RT), whereas on high loads, higher MPH doses improved error rates while slowing RT. Without medication, children with ADHD showed high error rates and slow RTs across both low and high loads, as did younger, normal control children. Because MPH slowed performance on only the most difficult high-load conditions, it is argued that the drug improves self-regulatory ability, enabling children with ADHD to adapt differentially to high and low loads. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Separate and combined effects of methylphenidate and behavior modification on boys with attention deficit-hyperactivity disorder in the classroom

This study evaluated the separate and combined effects of behavior modification and 2 doses of methylphenidate (MPH; 0.3 and 0.6 mg/kg) compared with baseline (no behavior modification and a placebo) on the classroom behavior and academic performance of 31 ADHD (attention deficit-hyperactivity disorder) boys attending a summer treatment program. Results revealed significant effects of both interventions, with the mean effect size of medication being more than twice as great as that of behavior modification. Relatively small incremental value was gained by the higher dose of medication or the addition of behavior modification, compared with the effects of the low dose of MPH. In contrast, the addition of either dose of MPH resulted in improvement beyond the effects of behavior modification alone. These group effects reflected those obtained in analyses of individual differences. Furthermore, comparisons of individual responsiveness showed that boys who responded to one treatment also responded to the other.     

Attention-deficit hyperactivity disordered boys' evaluations of and attributions for task performance on medication versus placebo.

The present study examined the effects of stimulant medication on the self-evaluations of and attributions for task performance of 26 attention-deficit hyperactivity disordered boys. Each boy performed a continuous performance task twice, once while on medication and once while on placebo. Immediately following the completion of the task, the boys were asked a series of questions concerning their self-evaluations of, and attributions for, their performance. Two findings of note were obtained. First, medication, compared with placebo, increased the correspondence between the boys' self-evaluations and their performance. Second, the boys did not use medication as a frequent explanation for their performance, as others have predicted. In fact, the boys picked medication as an explanation for their successes significantly less often than either effort or ability. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of methylphenidate on motivation in children with attention-deficit/hyperactivity disorder.

The effects of methylphenidate (MPH) on motivation were examined using a progressive ratio (PR) task in children who were prescribed MPH for the treatment of ADHD. Twenty-one children, 7 to 12 years of age, completed two test sessions, one under the effects of medication and one not. During each session, children pressed a lever to earn nickel reinforcers, where the first press resulted in a reinforcer and 10 additional presses were required for each subsequent reinforcer. Children on MPH had a significantly higher breakpoint than when off medication. This MPH-associated increase in the breakpoint manifested as a significant decrease in the interresponse times (IRT). Further, MPH administration resulted in a significant decrease in IRT variability. In contrast, MPH administration had no significant effects on the means and variability of postreinforcement pause duration. These results suggest that MPH increased motivation in children being treated for ADHD. Further, the inability of MPH to significantly reduce postreinforcement pause duration while simultaneously decreasing IRTs suggests that while MPH may increase motivation to perform an ongoing task, it may have little effect on the initiation of that task. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Behavioral, situational, and temporal effects of treatment of ADHD with methylphenidate

OBJECTIVE: To determine the behavioral, situational, and temporal effects of 4 months of methylphenidate (MPH) treatment for attention-deficit hyperactivity disorder (ADHD). METHOD: Ninety-one children with ADHD were randomly assigned to receive either MPH (titrated to a target dose of 0.7 mg/kg twice a day) or a placebo. Treatment effects were investigated with measures sensitive to various behaviors (core and associated symptoms), situations (home and school), time periods (morning and afternoon, after reaching the target dose, and after 4 months of treatment), and side effects. RESULTS: MPH treatment improved symptoms of ADHD and oppositional behavior at school, both in the morning and afternoon, but not at home. Side effects (increase in physiological and effective symptoms, lack of weight gain) were significantly more frequent with MPH than with placebo treatment. Benefit was evident after titration, but the onset of some side effects was delayed. Side effects were reported by parents but not by teachers. CONCLUSIONS: Positive effects of MPH on behavior are evident in the classroom, but with MPH given twice daily, parents do not report that MPH improves behavior at home. Greater impact on home behavior may require three times daily MPH and combined treatments.     

The effects of methylphenidate in the classroom: What dosage, for which children, for what problems?

In this study the authors conducted single-case analyses of the dosage and time-course effects of methylphenidate (MPH; Ritalin) on disruptive classroom behavior, math and reading performance, and social engagement. Clear individual differences were demonstrated (a) across children (aged 7 yrs) with attention deficit hyperactivity disorder (ADHD); (b) across academic, behavioral, and social domains of functioning; (c) for dose-response effects; and (d) in the onset and duration of effects. These results are in contrast to the majority of group studies that suggest a generally positive and linear dose-response effect for MPH across both children and domains of functioning. No particular dose-response relationship between disruptive behavior and academic performance was indicated. However, an increasing dosage of MPH was associated with increasing social withdrawal for 2 of the 3 participants. Implications for school-based medication evaluations and for designing optimal comprehensive interventions for children who receive MPH are discussed. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

The effects of self-esteem, success–failure, and self-consciousness on task performance.

Research has demonstrated that task performance of low self-esteem individuals (low SEs) suffers in the presence of self-focusing stimuli (e.g., a mirror). The present study determined if such stimuli must inevitably have adverse effects on low SEs. It was reasoned that if low SEs were provided with success feedback from a previous task, then the nature of their self-consciousness would be altered on a subsequent task. Specifically, low SEs should attend more to positive and less anxiety-provoking aspects of themselves than would low SEs who received failure feedback from the previous task. Under the former condition, low SEs' subsequent task performance was expected to improve. For high SEs, who typically perform well, success–failure feedback was expected to have little effect on subsequent performance. 90 undergraduates high and low in chronic self-esteem received false success or failure feedback from a task and completed a concept formation task in either the presence or absence of a mirror. Whereas high SEs performed equally well following success or failure, low SEs in the success condition performed significantly better than low SEs in the failure condition. This Self-Esteem?×?Prior Feedback interaction was significant in the presence of the mirror but not its absence. (21 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Naturally acquired learned helplessness: The relationship of school failure to achievement behavior, attributions, and self-concept.

Monitored personality and behavioral consequences of learned helplessness in children who had experienced extensive failure in school. Controlling for sex, race, age, and IQ, 3 groups of 20 9–12 yr old males (failing, average, and remedial) performed an experimental task and responded to questionnaires on self-concept and attributions for success and failure. To compare the predictive quality of learned helplessness theory with that of value expectancy theories, Ss were assigned to 1 of 2 reinforcement conditions (prediction of academic success and this prediction plus monetary reward) on a maze task. As predicted by value expectancy theories, failing Ss were significantly more persistent in the monetary reward condition than in the prediction of academic success condition. In agreement with learned helplessness theory, low self-concept was predicted independently and significantly by school failure, internal attributions for failure, and external attributions for success. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of self-esteem, hypothetical explanations, and verbalization of expectancies on future performance.

A hypothetical explanation task was used to make success- or failure-related cognitions differentially available for 60 high self-esteem (HSE) and 60 low self-esteem (LSE) undergraduates. Ss wrote an explanation for either a hypothetical failure or success, or they wrote no explanation. Half of the Ss in each condition stated performance expectancies. The effects of these variables on subsequent performance were examined. Success explanations increased the performance of both HSE and LSE Ss, whereas failure explanations only decreased the performance of LSE Ss. A content analysis revealed that the content of failure explanations, but not success explanations, was related to self-esteem and subsequent performance. These effects were more pronounced for Ss who stated expectancies, and expectancies were more highly correlated with performance in the explanation conditions than in the no-explanation control condition. Results are discussed in terms of current self-esteem theory and the cognitive processes associated with generating causal scenarios for success and failure, expectations, and performance. (57 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Expectancy of success and the probability learning of retarded children.

Tested 23 male and 22 female institutionalized retarded children who had previously experienced either a success, failure, or control precondition on a probability learning task designed to assess expectancy of success. Ss were matched for CA, MA, IQ, and length of institutionalization. The following measures were also collected as S variables: Locus-of-Control Scale, Cottage Rating Scales, school rating, and Reading and Arithmetic subscales from the Metropolitan Achievement Test. The preconditions were found to have many of the expected effects on the cognitive strategies employed in the learning task. Ss in the failure condition showed the greatest avoidance of failure (maximizing strategy), while Ss in the success condition tended to show more success striving (lose-shift strategy). Males were found to exhibit more failure-avoiding strategies than females. The overall pattern of results is interpreted as providing support for the hypothesis that a low expectancy of success in retarded children can be modified. (19 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Expectancies and attribution of adolescents prior to different outcomes and extinction.

44 5th, 50 7th, and 55 9th graders experienced either success or failure in puzzle solving and then worked at an extinction task. Questionnaires were completed prior to both treatment and extinction tasks. Consistent with previous findings in children, results from both questionnaires show that ratings of expectancy of success, anticipated enjoyment, and ability decreased significantly with age. For all age groups, success increased ratings for expectancy of success, enjoyment, and ability, but decreased ratings of task difficulty and luck. B. Weiner's (1979) hypothesized linkage between expectancy and the stability attribution dimension was obtained at all age levels. During the extinction task, 5th and 7th graders persisted longer than 9th graders, and persistence was significantly correlated with different ratings for different age groups. Sex differences for ratings of ability indicated a self-derogatory bias for 9th-grade females. (French summary) (27 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transdermal Methylphenidate, Behavioral, and Combined Treatment for Children With ADHD.

Stimulant medication and behavioral treatments are evidence-based for children with attention-deficit/hyperactivity disorder, but the combination of the 2 treatments has been understudied. In this investigation, methylphenidate (MPH) was crossed with 2 levels of behavior modification (BMOD) in a summer treatment program. Twenty-seven children with attention-deficit/hyperactivity disorder, aged 6-12, participated. Children received placebo and 3 doses of transdermal MPH (12.5 cm2, 25.0 cm2, and 37.5 cm2). BMOD was implemented on alternating weeks. Both treatments produced large and significant effects. Combined treatment was superior to either treatment alone. The effects of transdermal MPH were comparable to those found in this setting in previous studies with multiple stimulant medications and formulations. Consistent with other research, low doses of MPH--even lower than in previous studies--yielded enhanced effects in combination with behavior modification. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Motivation in a task situation as a function of ability and control over the task.

102 psychology students participated in the task of constructing and validating an "academic aptitude test." Training (level of ability) and amount of control over the task were manipulated in a 2 X 2 factorial design. For untrained Ss, performance was positively related to control. The performance of trained Ss was negatively related to control, contrary to prediction. This reversal was tentatively attributed to unintended "side effects" of the training manipulation. As predicted, expected success was positively related to training, perceived ability, and perceived control. A manipulation of success and failure in the task led to results consistent with predictions: Success produced incerases in satisfaction and perceived ability, while failure led to decreases in perceived ability. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Persistence at a difficult task with alternative task of intermediate difficulty.

60 male Ss were tested individually for persistence at an insoluble task presented to them as very difficult. They experienced repeated failure at the task but could turn to a similar task described as intermediate in difficulty whenever they wished. Differences in persistence at the initial task were examined between Ss high in n Achievement and low in Test Anxiety (HL) and Ss low in n Achievement and high in Test Anxiety (LH). Results show that: (a) persistence is positively related to initail estimates of probability of success (Ps) at the task for HL Ss (p s for LH Ss; (b) estimates of Ps tend to rise initially and then to fall following repeated failure (p     

Effects of methylphenidate on discounting of delayed rewards in attention deficit/hyperactivity disorder.

Impulsivity is a central component of attention deficit/hyperactivity disorder (ADHD). Delay discounting, or a preference for smaller, immediate rewards over larger, delayed rewards, is considered an important aspect of impulsivity, and delay-related impulsivity has been emphasized in etiological models of ADHD. In this study, we examined whether stimulant medication, an effective treatment for ADHD, reduced discounting of delayed experiential and hypothetical rewards among 49 children (ages 9–12 years) with ADHD. After a practice day, participants completed a 3-day double-blind placebo-controlled acute medication assessment. Active doses were long-acting methylphenidate (Concerta), with the nearest equivalents of 0.3 and 0.6 mg/kg TID immediate-release methylphenidate. On each testing day, participants completed experiential (real-world money in real time) and hypothetical discounting tasks. Relative to placebo, methylphenidate reduced discounting of delayed experiential rewards but not hypothetical rewards. Broadly consistent with etiological models that emphasize delay-related impulsivity among children with ADHD, these findings provide initial evidence that stimulant medication reduces delay discounting among those with the disorder. The results also draw attention to task parameters that may influence the sensitivity of various delay discounting measures to medication effects. (PsycINFO Database Record (c) 2010 APA, all rights reserved)