system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How exactly does ADD/ADHD affect the brain?

I’ve been diagnosed with ADHD for about 8 years now, and have been curious about it for a while. I know the symptoms (unfortunately), but am wondering what causes them directly.
gpt
The part of your brain that is responsible for executive-centered tasks such as organization, prioritization, focus, and attention, is chemically under-stimulated. It is said people with ADD can not focus; this is totally wrong! We can absolutely focus, but we can not choose what to focus on. We are slaves to whichever channel our brain flips to in that moment.