The concept of "maturational dysregulation" as discussed in one of Dr. Robert Melillo's 2022 paper (see link below) explains how kids with ADHD have issues with common findings such as impulsivity, inattention and hyperactivity. The brain matures from the bottom-up, and then top-down regulation occurs...but if the bottom-up maturity isn't complete, then issues like impulsivity, inattention and hyperactivity are more likely. See article here: https://www.frontiersin.org/articles/10.3389/fnana.2022.936025/full