Last weekend's seminar supported my impression that ADHD may be a low dopamine state, either due to decreased levels of the neurotransmitter or decreased receptor activity or numbers. It also supported my impression that low dopamine can follow from childhood trauma. We all know how vicious kids can be, so just being the youngest may constitute trauma. We also know that low status primates within a group have lower serotonin levels.
I personally know two adult humans who are beneficially treated for their ADHD with ritalin. Ritalin's mechanism of action is unknown, but it is thought to influence several neurotransmitters, most especially dopamine. Some texts say it is a dopamine and serotonin reuptake inhibitor.
My question is this: How does being a younger, smaller and lower status individual in a group of mammals affect your dopamine function? And what IS the relationship of dopamine function to ADHD?