April 29, 2026

The distinct symptom profiles of ADHD — namely, inattention and hyperactivity-impulsivity — follow their own unique behavioral and developmental pathways, and they may benefit from targeted interventions and treatment, suggests a new study published in Frontiers in Psychology.¹

Findings from the study show that ADHD symptoms arise not from a single deficit, but from different underlying brain systems involved in attention, behavioral control, emotional regulation, and sleep.

The research team found that symptoms of hyperactivity and impulsivity typically decrease as children age and are more commonly observed in boys, whereas inattention remains stable throughout development and affects boys and girls at similar rates. Overall, symptoms of inattention were found to be more severe than symptoms of hyperactivity and/or impulsivity.

Learning challenges appeared to be the strongest predictor of inattention, according to the study. Children with more severe inattentive symptoms showed greater difficulty sustaining focus, filtering out distractions, and managing mental effort. “These deficits directly impact classroom learning and explain the strong association [of inattention] with academic difficulties,” the researchers wrote.

The researchers also found strong associations between symptoms of hyperactivity-impulsivity and oppositional or conduct-related behaviors, emotional dysregulation, as well as specific sleep disruptions, such as restless sleep, nightmares, or unusual nighttime movements.

Sleep emerged as an important factor across both symptom clusters, but in different ways. While general sleep difficulties were loosely connected to inattention, disturbances in sleep–wake transitions, specifically restless sleep, nightmares, or sleep talking were a significant predictor of hyperactivity-impulsivity.

“Poor sleep may impair brain regulation systems, especially those tied to impulse control and emotional reactivity,” the researchers wrote.

“Sleep problems in youth with ADHD are associated with several negative outcomes,” said Stephen P. Becker, Ph.D., in the ADDitude webinar “Why Am I Always So Tired? The Latest Science on Improving Sleep in Children and Teens with ADHD.” “They impact functioning during the day, be it at school or at home, and they are associated with mental health problems over time. Sleep problems in adolescents with ADHD are tied to poorer quality of life, as well as poor academic performance and lower grades.”

Low-Anxiety, High-Impulsivity Subtype

Interestingly, children with lower levels of anxiety tended to show higher levels of hyperactivity and impulsivity, leading researchers to infer that anxious behaviors may suppress overt hyperactive behaviors. Children with anxiety may be more cautious, self-aware, or responsive to consequences, while children with low anxiety may be more prone to risk-taking and impulsive actions and less responsive to threat cues.

This finding points to a possible “low-anxiety, high-impulsivity” subtype of ADHD.

The recognition that different ADHD symptom profiles are driven by different neurological mechanisms could reshape how clinicians diagnose and treat the condition and its many subtypes.

For example, children with primarily inattentive symptoms may benefit most from academic support, cognitive interventions, and strategies that strengthen attention and information processing. Children with more pronounced hyperactivity and impulsivity may respond best to behavioral therapy, emotional regulation support, and interventions that address sleep quality.

This cross-sectional study was conducted at the outpatient Cognitive Center of Guangxi Zhuang Autonomous Region People’s Hospital, between December 2020 and December 2022. It included a sample of 331 children aged 6 to 12 years with ADHD.

Source

¹Fu Y, Qin Z, Qin L, Zhang H, Liu H, Huang S and Li D (2025) Multidimensional factors associated with ADHD core symptoms in children: cognition, sleep, behavior, and demographics. Front. Psychiatry. https://doi.org/10.3389/fpsyt.2025.1658202