IIRC: the front part of our brain controls the executive function. Executive function is what helps us start tasks, know which task to start, organize sensory information–among other things.
Doing those things requires a few neurotransmitters, including norepinephrine and dopamine. People with ADHD have brains that don’t use them correctly. It shows up on certain kinds of brain scans, even.
(the stimulant meds like adderall and ritalin work in part because they tell our brains to make more norepinephrine and dopamine)
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