ADHD Neuroscience Glossary
Quick reference for key terms, brain regions, and concepts. Print-friendly.
Core Brain Regions
Frontal Lobe (/ˈfrən-təl ˈlōb/)
The frontmost part of the brain, responsible for executive functions: planning, impulse control, sustained attention, working memory, and goal-directed behavior.
In ADHD, this region shows reduced activity and altered development. It's the "CEO" of the brain — the source of attention regulation, not attention itself.
Prefrontal Cortex (PFC) (/prē-ˈfrən-təl ˈkȯr-ˌteks/)
The very front portion of the frontal lobe. Critical for "holding things in mind" (working memory), suppressing inappropriate responses, and making decisions.
The PFC is one of the key regions affected in ADHD. Stimulant medications primarily increase dopamine and norepinephrine activity here.
Basal Ganglia (/ˈbā-səl ˈgaŋ-glē-ə/)
A group of structures deep in the brain responsible for habit formation, automatic behaviors, and procedural learning.
Critically, this system is fully intact in ADHD. Habits don't require attention or frontal lobe function — they're automatic. This makes habit-building a key strategy for ADHD management.
Amygdala (/ə-ˈmig-də-lə/)
Almond-shaped structure deep in the brain that processes fear, threat detection, and emotional salience — especially negative emotions.
The amygdala is the engine behind "dirty motivators" — it fires strongly in response to anxiety/fear/threats, which can override the underactive frontal lobe to force action.
Neurotransmitters
Dopamine (/ˈdō-pə-ˌmēn/)
A neurotransmitter that drives motivation, wanting, reward anticipation, and behavioral activation. It determines what you want to do — not what you enjoy.
Popular culture calls it the "pleasure chemical" — wrong. Dopamine is about motivation, not pleasure. You can have high dopamine and not feel good. You can feel good without high dopamine.
Norepinephrine (/ˈnȯr-ˌe-pə-ˈne-frən/)
A neurotransmitter involved in alertness, arousal, and attention. Works alongside dopamine in the prefrontal cortex to enable focus.
Many ADHD medications (e.g., atomoxetine/Strattera, guanfacine) target norepinephrine rather than dopamine. It's the "alertness" partner to dopamine's "motivation."
Endocannabinoids (/ˌen-dō-kə-ˈna-bə-ˌnȯidz/)
The brain's natural cannabinoids — neurotransmitters that regulate the basal ganglia and habit formation system.
This is why cannabis affects habit formation. The habit system runs on endocannabinoids, not dopamine — it's a separate circuit, which is why it remains functional in ADHD.
Key Concepts
Disordered Attention
The core feature of ADHD: inability to regulate where attention goes, when to shift it, and how long to sustain it. Not a deficit of attention — a deficit of attention control.
This is why ADHD includes both distractibility AND hyperfocus. Both are failures of regulation — you can't control where the attention spotlight points.
Perseveration (/pər-ˌse-və-ˈrā-shən/)
The inability to stop a behavior or shift tasks even when it's no longer appropriate. In ADHD, this is what people often mislabel as "hyperfocus."
Dr. Russell Barkley distinguishes perseveration (ADHD — can't stop) from true hyperfocus (autism — intense, chosen concentration). In ADHD, it's a symptom of frontal lobe dysfunction, not a gift.
Executive Function
The set of mental skills managed by the frontal lobe: working memory, flexible thinking, self-control, planning, organization, and task initiation.
ADHD is fundamentally a disorder of executive function. The gap between knowing what to do and actually doing it is the executive function gap.
Inverted-U Curve of Stimulation
The relationship between environmental stimulation and cognitive performance. Performance peaks at a moderate level of stimulation — too little = under-arousal, too much = over-arousal.
The ADHD brain's curve is shifted to the right — it needs more stimulation to reach optimal performance. This explains body doubling, background music, and why quiet rooms make ADHD worse.
Dirty Motivators
Negative emotions (anxiety, anger, shame) used to compensate for impaired dopamine-driven motivation. They work but are "radioactive" — effective in the short term, damaging long-term.
Coined by Dr. K. People with ADHD often learn to use anxiety about deadlines, anger at themselves, or shame about past failures to force productivity. This leads to burnout and depression.
Body Doubling
The practice of having another person present (physically or virtually) while working, without them actively helping. Increases environmental stimulation to near-optimal levels.
Works through the inverted-U curve: another person's presence raises baseline stimulation. This is a legitimate, science-backed ADHD strategy, not a gimmick.
Negativity Bias
The brain's hardwired tendency to weigh negative information more heavily than positive. Evolutionarily adaptive — missing a threat could kill you, missing a reward won't.
This bias makes negative emotions extremely powerful motivators. One criticism outweighs nine compliments. The ADHD brain, struggling with normal motivation, can become dependent on this pathway.
Neurodivergence
The concept that neurological differences like ADHD are natural variations in human brain wiring, not deficits to be "fixed." Emphasizes differences rather than disorders.
This framing helps reduce shame, but doesn't negate the real functional challenges. Both perspectives — "different brain" and "needs support" — can be true simultaneously.
Cognitive Reframing
The process of consciously changing how you interpret a situation. Uses the intact analytical/forebrain to create new mental models that bypass the dysfunctional attention system.
Example: Reframing "I'm going to fail anyway" into "I'll try to delay failure as long as possible" reduces the impulse to create chaos and allows habit formation to begin.
Task Initiation
The executive function of starting a task. Distinct from task completion — many people with ADHD can finish things once started but struggle enormously with the starting itself.
This is the dopamine problem in action: without sufficient "wanting" signal, the brain doesn't generate the activation needed to begin. External pressure or negative emotion can bypass this block.