Recent research highlights the role of processing speed as a key factor underlying reading difficulties and inattentive behaviour, emphasising the importance of comprehensive evaluation for children with suspected learning and attention challenges.
Executive function is the set of mental skills that help a child hold a goal in mind, plan the steps to reach it, start work and adjust course when something goes wrong. Healthline and Cleveland Clinic both describe it as a cluster of abilities that includes working memory, cognitive flexibility and inhibition, with planning, organisation and self-monitoring built on top. In practical terms, these skills shape how a child follows instructions, solves problems and manages everyday demands.
That matters in dyslexia because reading can consume the very mental space executive function depends on. When decoding is slow or effortful, working memory is tied up just keeping the words in place, leaving less room for comprehension, remembering directions and checking whether an answer makes sense. From the outside, this can look like disorganisation or poor follow-through, when the real problem is that the reading task is using up the child’s capacity.
Research cited in the source material also suggests that processing speed may sit underneath both reading difficulty and some behaviours that resemble inattention. A 2011 study by Lauren McGrath, Bruce Pennington, Erik Willcutt, Richard Olson and colleagues in the Journal of Child Psychology and Psychiatry found that processing speed had a unique relationship to both reading problems and inattentive behaviour, and that the association between reading difficulty and inattention weakened when processing speed was included in the model. That helps explain why some children appear distracted in class even when the core issue is not attention at all, but how quickly they can take in and act on information.
The other important possibility is that dyslexia and ADHD are both present. The source material notes that published estimates of co-occurrence vary widely, which means there is no single settled figure to rely on. What does matter is where the difficulty shows up: ADHD tends to affect behaviour across settings, while dyslexia-related struggles often intensify around reading and writing. For parents and caregivers, the most useful next step is not to guess from behaviour alone, but to ask for a full evaluation that looks at fluency, rapid automatized naming, working memory and attention together. A child may need reading support, attention support, or both, but the reading itself still needs direct instruction.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
