Decision-making requires the dorsolateral prefrontal cortex (DLPFC) to hold options in working memory, the ventromedial prefrontal cortex (VMPFC) to assign value to each option, and the anterior cingulate cortex (ACC) to detect conflicts between similarly valued options and resolve them. In ADHD, all three regions are functionally underactive.
The result is what decision scientists call 'choice overload,' but experienced at dramatically lower thresholds. Research by Sheena Iyengar shows that even neurotypical people make worse decisions with more options. For ADHD brains with working memory capacity 30-40% below average, the overload threshold drops from ~7 options to ~2-3.
The emotional dimension is equally important. ADHD involves reduced emotional regulation, meaning the anxiety generated by the possibility of choosing 'wrong' is not modulated by the prefrontal cortex. This 'anticipated regret' grows with each option, eventually overwhelming the decision-making system entirely and triggering avoidance.
