Intact Context-Dependent Modulation of Conflict Monitoring in Childhood ADHD

Bluschke, Annet; Chmielewski, Witold X.; Roessner, Veit; Beste, Christian · 2020 · Crossref

DOI: 10.1177/1087054716643388

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Summary

This study investigates whether children with Attention-Deficit/Hyperactivity Disorder (combined subtype, ADHD-C) exhibit deficits in context-dependent conflict monitoring, specifically the "Gratton effect." The Gratton effect describes the phenomenon where interference from conflicting stimuli is reduced if the previous trial also contained conflict, suggesting an adaptive adjustment of cognitive control based on recent experience. While ADHD is broadly associated with executive function impairments, it remained unclear whether this specific, basic mechanism of action monitoring is deficient or preserved in pediatric patients. The authors aimed to clarify this by comparing ADHD-C children to healthy controls, addressing theoretical debates regarding whether deficits in ADHD stem from impaired conflict monitoring, stimulus priming, or implicit learning. The researchers employed a modified sequence flanker task involving 18 children with ADHD-C (mean age 11.1 years) and 17 healthy controls (mean age 13.5 years). Participants responded to central arrow targets flanked by compatible or incompatible arrows under time pressure (450 ms deadline). The experimental design included "predictable" blocks with repetitive trial sequences to maximize expectancy effects and "unpredictable" blocks with pseudo-randomized sequences to control for learning effects. Statistical analysis utilized repeated-measures ANOVAs with age as a covariate, alongside Bayesian statistics to evaluate evidence for the null hypothesis. The primary metrics were reaction times (RTs) for correct responses and error rates. The results indicated that children with ADHD-C made significantly more errors (38.3%) than healthy controls (28.0%), confirming general performance deficits. However, there were no significant differences in reaction times between the groups. Crucially, the analysis revealed no interaction between group and trial sequence, demonstrating that the reduction in interference following incongruent trials (the Gratton effect) was intact in the ADHD group. Bayesian statistics provided strong support for the null hypothesis regarding RT differences, confirming that the ability to modulate response control based on contextual information was preserved in ADHD-C patients. This pattern held true regardless of trial predictability or sequence type. The findings suggest that while ADHD-C is associated with broad executive control deficits, the specific mechanism of context-dependent conflict monitoring remains functional. The authors interpret the combination of intact RTs and higher error rates as indicative of increased performance variability and momentary lapses in attention rather than a fundamental inability to monitor conflict. The preserved Gratton effect aligns with theories attributing this phenomenon to intact stimulus priming and implicit memory processes in ADHD. These results imply that executive control deficits in ADHD may be less pervasive than previously assumed, particularly regarding rudimentary, perceptually driven action control mechanisms. This distinction highlights the need to differentiate between basic monitoring processes and more complex executive functions when characterizing cognitive dysfunctions in ADHD.

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• executive function