Control of Response Inhibition in Children with ADHD on the Continuous Performance Test under Various Intervals (original) (raw)
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This study compares behavioral and electrophysiological (P300) responses recorded in a cued continuous performance task (CPT-AX) performed by children with attention deficit hyperactivity disordercombined subtype (ADHD-com) and age-matched healthy controls. P300 cognitive-evoked potentials and behavioral data were recorded in eight children with ADHD (without comorbidity) and nine control children aged 8-12 years while performing a CPT-AX task. Such task enables to examine several kinds of false alarms and three different kinds of P300 responses: the ''Cue P300'', the ''Go P300'' and the ''NoGo P300'', respectively, associated with preparatory processing/attentional orienting, motor/ response execution and motor/response inhibition.
Developmental Medicine & Child Neurology, 2008
We examined the effects of previous trials on subsequent trials on performance in the continuous performance test (CPT) in children with attention-deficit-hyperactivity disorder (ADHD). Thirty-five non-medicated children with ADHD (31 males, four females; mean age 9y 10mo [SD 2y 4mo]) and 33 comparison children (20 males, 13 females; mean age 10y [SD 2y 7mo]) were tested using a novel CPT, in which stimuli were presented with 50% target probability. Reaction time, reaction time variability, omission, and commission error rate were analyzed for two different types of trials in which different responses (switched trials) or the same responses (repeated trials) were required for two consecutive trials. Compared with the comparison group, children with ADHD showed a greater increase in commission error rate from repeated to switched trials, i.e. increased switch cost for commission error rate. On the other hand, omission error rate was not influenced by the previous trial in both ADHD and comparison groups. These results suggest that children with ADHD have trouble in response switching when an inhibitory process is involved. List of abbreviations CPT Continuous performance test CRT Cathode-ray tube EF Executive function RT Reaction time
Acta Neurologica Belgica, 2013
This study compares behavioral and electrophysiological (P300) responses recorded in a cued continuous performance task (CPT-AX) performed by children with attention deficit hyperactivity disordercombined subtype (ADHD-com) and age-matched healthy controls. P300 cognitive-evoked potentials and behavioral data were recorded in eight children with ADHD (without comorbidity) and nine control children aged 8-12 years while performing a CPT-AX task. Such task enables to examine several kinds of false alarms and three different kinds of P300 responses: the ''Cue P300'', the ''Go P300'' and the ''NoGo P300'', respectively, associated with preparatory processing/attentional orienting, motor/ response execution and motor/response inhibition.
The Japanese Journal of Special Education
is knewn well as a developmental disorder characterized by behavioral inhibition. The present study aimed to investigate developmental changes and characteristics of inhibitory control in children with ADHD. For this purpose, we used a stop-signal task, modifying the procedure in order to determine the timing of the stop delay so that the timing was related to individual response speed, Participants, elementary-school-age children with ADHD (jV == 18) and without ADHD (controls; N=64), were divided into 2 groups, younger and older. The children with ADHD had variable reaction time; the rate of their errors was high compared to the control children. Their reactions to go signals were ineficient; there were no differences between the 2 ADHD groups on the inhibition. Some children with ADHD were able to inhibit the response to go signals and used waiting strategies, as did the control children. However, the change in their inhibitory control with increasing age was slow in comparison with the control children. We found that how the strategies were used was related to inhibitory control.
Inhibition in ADHD and non-ADHD children ages 6-12 years
Attention-Deficit/Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder that begins to emerge in childhood. This disorder is caused by an impaired prefrontal cortex (PFC) development that affects executive functions, particularly in inhibition, resulting in loss of cognitive and behavior control. This research aims to investigate the difference between inhibition in ADHD and non-ADHD children ages 6-12 years old and between the three subtypes of ADHD. Subjects in this study were children with ADHD (N=34) which consists of the inattentive type (N=14), hyperactive-impulsive type (N=9), and combination type (N=11), as well as non-ADHD children (N=34). This research used the causal-comparative method. The instrument which was utilized in this study is The Stroop Color and Word test to measure inhibition. Results of this research showed that there are differences in inhibition between ADHD and non-ADHD children and between age 6-9 years and 10-12 years old children. However, there is no difference of inhibition between three subtypes of ADHD.
Psychophysiology, 2007
Deficits in response inhibition may be at the core of the cognitive syndrome in ADHD. Here, inhibitory control mechanisms were studied in 36 ADHD-combined type and 30 healthy children by exploring the event-related brain activity during the Stop Signal task. The influence of age, gender, and previous treatment history was evaluated. The ADHD group showed reduced N200 wave amplitudes. For successful inhibitions, the N200 reduction was greatest over right inferior frontal scalp, and only the control group showed a success-related enhancement of such right frontal N200. Source analysis identified a source of the N200 group effect in right dorsolateral prefrontal cortex. Finally, a late positive wave to failed inhibitions was selectively reduced only in treatment-naı¨ve ADHD children, suggesting that chronic stimulants may normalize late conscious error recognition. Both effects were independent of gender and age.
Journal of Child Psychology and Psychiatry, 1996
We systematically reviewed the patterns of Continuous Performance Test (CPT) errors of omission and commission exhibited by normal children and children with Attention Deficit and Hyperactivity Disorder (ADHD) under no drug, placebo and methylphenidate drug conditions. Findings from 26 studies were submitted to a meta-analytic procedure. In contrast to the contradictory findings of individual reports, our results revealed that children with ADHD made significantly more errors of omission and commission than normal children. As well, in children with ADHD and treated with methylphenidate, statistically significant reductions in the rate of both error types were noted. The effects of methylphenidate on the percentage of hits (i.e. 1 - omissions) were greater in experiments using shorter stimulus duration, smaller number of trials and higher probability of a target. Using Signal Detection Theory (SDT) parameters, we found that children with ADHD were less sensitive to the difference between targets and non-targets than their normal counterparts, while showing a comparable response bias. Similarly, the effects of methylphenidate were restricted to improving the sensitivity, while not affecting response bias, in both normal children and those with ADHD.
Inhibitory capacity in adults with symptoms of Attention Deficit/Hyperactivity Disorder (ADHD)
Archives of Clinical Neuropsychology, 2003
Adult participants for the current study were placed into one of two groups depending on whether they manifested either high or low symptom levels of Attention Deficit/Hyperactivity Disorder (ADHD) as determined by the Wender Utah Rating Scale. Participants were also assessed on a battery of cognitive tasks as well as symptoms of depression, anxiety and substance abuse. The ADHD symptom groups were comparable in age and symptoms of depression, anxiety, and substance abuse. Adults with greater ADHD symptomatology performed more poorly on cognitive measures of response inhibition (the Stop-Signal task) and visual attention, compared to those with fewer ADHD symptoms. Regression analysis indicated the Stop-Signal task accounted for a greater proportion of the variance of ADHD symptomatology than any other cognitive variable. The conclusions from the findings are discussed in relation to self-regulation model of ADHD.