Temporal processing impairment in children with attention-deficit-hyperactivity disorder.

Huang et al. (2012) compared kids with ADHD to kids without it. They gave both groups short timing games in a quiet lab. The games asked them to judge which beep or light lasted longer.

The team also asked parents if anyone else in the family had ADHD. They wanted to see if family history made timing worse.

Kids with ADHD missed the correct timing answer more often than their peers. The gap was largest for kids who also had ADHD in the family.

In plain words, the brain’s internal clock looked slower and jumpier in ADHD, and family history turned the problem up a notch.

Debrabant et al. (2013) ran a similar lab set-up with children who have Developmental Coordination Disorder. Both studies find that clinical groups lag on simple timed tasks, so timing checks can help either diagnosis.

Fenollar-Cortés et al. (2017) show that inattention, not hyperactivity, drives fine-motor errors. Jia’s timing data line up: the trouble is more about focus than excess movement.

Lin et al. (2021) found that some kids with ADHD have visual attention gaps while others have auditory ones. Jia adds a third piece—timing—so your test battery should cover all three.

Chiang et al. (2013) report that only inattention predicts poor visuospatial planning. Jia agrees: inattention again predicts poor timing, building a pattern that inattention links to several ‘cold’ cognitive skills.

If a client with ADHD looks slow or variable, do not blame motivation alone. Run a quick timing probe—clap pairs, light sequences, or app-based duration games. Note family history; it flags kids who may need the most practice. Add timing goals to IEPs or skill plans the same way you target reading or math fluency.