A preliminary study of the effects of stimulant medications on estimates of psycholinguistic abilities for children with attention-deficit/hyperactivity disorder.

The study had a very small sample size (26 children), which limits the ability to detect modest effects and generalize the findings. The design was single-blind; while examiners did not know the medication status, the children themselves knew whether they had taken their medication, which could influence their effort or approach to the tasks. Participants took various stimulant medications and doses, rather than a single controlled medication, reflecting real-world use but reducing experimental control. The study only examined stimulant medications, so results do not apply to children taking non-stimulant ADHD medications. The children were younger (6-9 years) than in many previous studies, and the results are preliminary, requiring independent replication.

The authors report no conflicts of interest.

Do not assume that medication improves all language or cognitive skills. Significant effects were found only for sentence recall and receptive vocabulary, not for reading, nonverbal IQ, or narrative abilities. Additionally, because the children knew their medication status, the improvement might partly reflect behavioral changes or increased effort rather than a direct change in linguistic competence.