Why "Just Try Harder" Doesn't Work for ADHD Brains
“I know what I need to do. I just can’t make myself do it.”
If you work with ADHD clients, you’ve heard some version of that sentence. Many of them have also heard “try harder” for most of their lives. From teachers. From bosses. Sometimes from us.
The research points somewhere else. Here’s what it shows, what it doesn’t, and what to do with it in session.
What the brain imaging research found
The largest study of subcortical brain volume in ADHD pooled data from 1,713 people with ADHD and 1,529 controls across 23 sites (Hoogman et al., 2017). The ADHD group had smaller volumes in the nucleus accumbens, amygdala, caudate, hippocampus, and putamen. The differences were small. Effect sizes ranged from about 0.11 to 0.19. But the sample was big enough to make them hard to dismiss.
Two details matter. The differences showed up in children, not adults. And medication history didn’t explain them, which pushes back on earlier reports that medication changes these volumes.
The nucleus accumbens deserves a second look. It’s a core part of the brain’s reward system.
A separate study of basal ganglia shape in children with ADHD found compression in parts of the caudate and anterior putamen (Qiu et al., 2009). Those regions connect to circuits involved in movement planning and prefrontal function.
What the dopamine research adds
Structure is one piece. Function is another.
Volkow and colleagues used PET scans to measure dopamine markers in 53 adults with ADHD who weren’t on medication and 44 controls (Volkow et al., 2009). Dopamine transporter and receptor availability was lower in the ADHD group in regions of the reward pathway. Lower availability tracked with more inattention symptoms.
The authors framed this as a disruption in the brain’s reward and motivation pathway. That’s a very different story than a lack of effort.
What this does and doesn’t tell us
These are group averages. Individual clients vary, and the groups overlap.
Small effect sizes mean no one can scan a brain and diagnose ADHD.
Imaging shows differences. It doesn’t prove that a specific difference causes a specific behavior.
The pattern does suggest that reward and planning systems may work differently in ADHD. That’s a better starting point than assuming a client isn’t trying.
Interest, not importance
Psychiatrist William Dodson built a clinical framework around this idea. He calls it the interest-based nervous system. Most people can push through a dull task because it matters. Many ADHD clients can’t. What gets them moving is interest, novelty, challenge, urgency, or passion. His shorthand is PINCH: Passion, Interest, Novelty, Competition, Hurry.
One caution. This is a clinical framework, not a lab-tested diagnostic category. It also gets flattened online into “ADHD brains can’t do boring things.” That’s not the claim. The claim is that boring tasks need a different kind of fuel.
What this looks like in session
Picture the client who writes a polished 20-page paper at 2 a.m. the night before it’s due. The same client hasn’t answered a two-line email in three weeks.
That isn’t selective laziness. Urgency switched one task on. Nothing switched the other one on.
What to do differently
Stop treating follow-through gaps as motivation problems. Ask what reward or structure is missing from the task.
Treat external scaffolding as legitimate support. Timers, body doubling, and accountability check-ins are accommodations, not crutches.
Help clients add interest, novelty, or urgency on purpose. Make it a game. Set a short deadline. Work alongside someone.
Separate “doesn’t want to” from “the wanting-to-doing connection works differently here.”
Ask the client what has worked. Research describes groups. Your client is one person.
The takeaway
Effort isn’t the missing ingredient. When we stop asking “why won’t they try harder?” and start asking “what would make this task workable for this brain?”, sessions get more useful. Clients also put down shame that was never theirs to carry.
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References
Hoogman, M., Bralten, J., Hibar, D. P., et al. (2017). Subcortical brain volume differences in participants with attention deficit hyperactivity disorder in children and adults: a cross-sectional mega-analysis. Lancet Psychiatry, 4(4), 310-319.
Qiu, A., Crocetti, D., Adler, M., Mahone, E. M., Denckla, M. B., Miller, M. I., & Mostofsky, S. H. (2009). Basal ganglia volume and shape in children with attention deficit hyperactivity disorder. American Journal of Psychiatry, 166(1), 74-82.
Volkow, N. D., Wang, G.-J., Kollins, S. H., et al. (2009). Evaluating dopamine reward pathway in ADHD: clinical implications. JAMA, 302(10), 1084-1091.