Do children with ADHD struggle with all executive functions?
Children with ADHD show distinct difficulties with memory updating and mental shifting, but they do not struggle with dividing their attention or resisting distractions compared to typically developing peers.
Source
Differences in Executive Functioning in Children with Attention Deficit and Hyperactivity Disorder (ADHD)
What they did
The researchers compared cognitive performance between 26 unmedicated children diagnosed with ADHD and 29 typically developing children, all aged 9 to 10 years. They measured four key cognitive skills: divided attention, attentional shifting, updating, and inhibition. To ensure fair comparison, the difficulty of the memory recall tasks was customized to each child's individual memory span.
What they found
Children with ADHD made significantly more mistakes on the memory-updating task, especially during the 2-back condition, and took longer to complete the attention-shifting test. Surprisingly, on the dual-attention task, the ADHD group actually managed their attention better than the control group, maintaining performance when another task was added. Additionally, the study found no significant differences between the groups in resisting cognitive interference, though children with ADHD were generally slower to read simple words.
The limits
What it doesn't show
The study's small sample size of 26 children with ADHD and 29 typically developing children, which included very few girls, limits how well these findings apply to all children with ADHD. Because the ADHD group only contained 6 children with the inattentive subtype compared to 20 with the combined subtype, the researchers could not reliably compare differences between different types of ADHD. Furthermore, the study could not fully control for co-occurring emotional or behavioral difficulties that might influence cognitive performance.
Key terms
- Executive functions
- A set of cognitive processes that enable goal-directed behaviors, such as planning, focusing attention, and managing multiple tasks.
- Working memory
- A limited-capacity system that temporarily holds and manipulates information for immediate cognitive tasks.
- Divided attention
- The cognitive ability to focus on and process multiple sources of information or perform more than one task simultaneously.
- Attentional shifting
- The mental capacity to flexibly switch focus between different tasks, rules, or types of information.
- Updating
- The continuous monitoring and rapid addition or deletion of working memory contents as new information arrives.
- Interference control
- The ability to ignore distracting stimuli or suppress an automatic, dominant response in favor of a goal-directed one.
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Quiz yourself
According to the study, what is the estimated childhood prevalence of ADHD and its occurrence ratio between boys and girls?
Common questions
Why did children with ADHD do better on the dual-attention task than typically developing children?
The researchers suggest that adding a secondary task may have provided a higher, more optimal level of mental stimulation. This extra stimulation could have increased their arousal and motivation, preventing the boredom and lack of effort often triggered by overly simple tasks.
Why did the researchers customize the difficulty of the memory tasks for each child?
By adjusting the tasks to each child's individual memory span, the researchers ensured that differences in dual-task performance reflected their ability to divide attention rather than differences in basic memory capacity.
Does this study prove that ADHD is caused by executive functioning deficits?
No, the results show that while executive function deficits are a key component of ADHD, they are not present in every child with the diagnosis, indicating that ADHD is a complex and highly varied condition.
What are the practical, real-world takeaways of these findings for classrooms?
To help children with ADHD who struggle with updating information, teachers can break instructions down into smaller, clear steps. Structuring activities into shorter timeframes can also prevent fatigue and help them maintain focus.
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