Speech-Sound Disorders and Attention-Deficit/Hyperactivity Disorder Symptoms

This study investigated the relationship between speech-sound disorders (SSD) and symptoms of attention-deficit/hyperactivity disorder (ADHD). The researchers sought to determine if the severity of a child's SSD or the presence of a bilineal family history of SSD (where both sides of the family have a history of the disorder) influenced the development of ADHD symptoms. The study included 412 children, categorized into five groups based on SSD severity: no SSD, resolved SSD, mild SSD, mild–moderate SSD, and moderate–severe SSD. The researchers used standardized tests to assess speech and language, and parents completed the ADHD Rating Scale (ARS) to evaluate inattention and hyperactivity/impulsivity.

While children with moderate–severe SSD exhibited higher levels of inattention and hyperactivity compared to those without SSD, the severity of the speech disorder itself was not the primary driver of these symptoms. Instead, the presence of comorbid language impairment (LI) emerged as the most significant predictor of ADHD symptoms across all analyses. Furthermore, while children from families with a bilineal history of SSD showed higher levels of inattention, this genetic load was less predictive of ADHD symptoms than the presence of language impairment. The findings suggest that the observed link between SSD and ADHD is largely mediated by comorbid language deficits rather than the speech-sound disorder itself.

These results highlight the importance of distinguishing between different developmental disorders in clinical practice. Because children with both SSD and language impairment are at a significantly higher risk for attention deficits, clinicians should be aware that what may appear to be ADHD-related inattention could, in some cases, be a manifestation of underlying language processing difficulties. This distinction is critical for ensuring that children receive appropriate, targeted interventions rather than potentially ineffective treatments for misidentified conditions. The study underscores the need for comprehensive assessments that account for comorbid language and attentional profiles in children presenting with speech-sound disorders.