I like to think about the stars and classical music. I’m pretty good at it having a Masters in Aerospace Engineering and having played oboe at the state and regional level. I also like monster trucks and surf youtube fail videos.
How’s that for low-level and high-level thinking?
Seriously, what I know about ADHD is that there is no impairment of the level of thinking. It’s the executive functioning and working memory where we have difficulty. Here’s a link to the executive functioning piece of the ADHD brain. Executive Functions Impaired in ADD/ADHD
Dr. Brown’s model lists that we have trouble with activation, focus, effort, emotion, memory and action. In an academic environment this may appear as difficulty thinking or learning but it is difficulty not disability.
Hope this helps adds to your understanding of ADHD.