ADHD and Dopamine: The Neuroscience Behind Attention, Motivation, and the Threshold Model

Why Your ADHD Brain Craves More — and How to Work With It

ADHD is not simply an attention deficit. That framing has caused more harm than any other idea in the neuroscience of this neurodevelopmental condition. What the research consistently shows — and what I observe in every client who comes to my practice after years of being told to try harder — is that ADHD is a dopamine regulation difference. The brain’s reward system requires higher stimulation thresholds to activate the same focus and motivation that neurotypical brains access at baseline. Once you understand that mechanism, the specific pattern of ADHD struggles stops looking like character failure and starts looking like predictable neurobiology.

The secret to understanding ADHD neural indicators starts with understanding dopamine — the neurotransmitter that controls focus, motivation, and reward signaling. When you understand how your brain uses dopamine differently, you stop fighting your neurobiology and start designing with it.

ADHD Challenge	Dopamine Mechanism	Why It Happens	Environmental Design Solution
Can’t start tasks	Low tonic dopamine → insufficient activation signal	Task doesn’t meet reward threshold	Pair task with novelty, urgency, or immediate reward
Can’t sustain attention	Rapid dopamine habituation	Reward signal drops faster than neurotypical	Chunk tasks into shorter segments with visible progress markers
Hyperfocus on wrong things	High-interest task floods dopamine	Task exceeds threshold → system locks on	Use timers and external interrupts to break the lock
Emotional dysregulation	Dopamine affects emotional circuitry, not just attention	Insufficient prefrontal modulation of limbic signals	Build awareness of emotional onset; use structured pauses
Time blindness	Dopamine affects temporal processing in the striatum	Internal clock runs differently without consistent reward signal	External time structures: alarms, visual timers, body-doubling

What Dopamine Actually Does in Your Brain

Dopamine drives your brain’s motivational architecture. It is the signal that determines whether an activity is worth pursuing — not whether it is enjoyable, but whether the brain’s prediction system assigns it sufficient reward probability to allocate attentional resources. For most brains, ordinary daily tasks generate enough dopamine signaling to sustain engagement. In ADHD, the threshold is elevated. The same task produces less signal, and the brain’s response is to disengage and seek higher-amplitude input.

Your brain has something called dopamine transporters that work like cleanup crews. They collect dopamine from the spaces between brain cells and take it away. Research shows that ADHD brains have more of these transporters working overtime — a pattern linked to specific genetic variants regulating transporter expression, a heritable factor in ADHD neurobiology — leaving the reward system without sufficient dopamine signal to sustain focus on low-stimulation tasks. Heritability studies indicate that genes account for approximately 70–80% of ADHD variance.

In my practice, I work with clients who describe feeling like they need constant stimulation or cannot seem to get started on important tasks. One client — a marketing executive — could hyperfocus on designing graphics for hours but could not start writing a simple email. This is not willpower failure. It is the direct expression of how her brain’s dopamine system responds differently to different categories of task. The design work exceeded her activation threshold. The email did not.

How ADHD Changes Your Brain’s Reward System

Your brain has a built-in reward system that is supposed to drive you toward completing tasks, reaching goals, and sustaining effort on activities that matter. When you complete something meaningful, dopamine release creates a satisfaction signal that reinforces the behavior. In ADHD, this signal is weaker, slower, or both — which means the same effort produces less neurological reward, and the brain registers ordinary tasks as not worth the energy required to sustain them.

This is why the ADHD pattern is so specific: low engagement with routine tasks (bills, paperwork, repetitive process), while high engagement with novel, urgent, or intrinsically interesting tasks is entirely possible. The reward system is not globally impaired — it is calibrated differently. High-stimulation inputs exceed the threshold and the brain engages. Low-stimulation inputs fall below it and the brain looks for an exit.

I worked with a client in software development who told me he felt like he was constantly chasing the “feeling” that would make him want to work. We discovered that his brain was not malfunctioning — it was executing its reward architecture exactly as designed. The problem was that his environment was full of tasks below his activation threshold and full of readily available alternatives above it. Once we understood the mechanism, we could redesign the environment rather than trying to force willpower against a neurological reality.

The brain regions most dependent on dopamine signaling in ADHD are the prefrontal cortex and the areas managing planning, decision-making, and impulse control. When these areas receive insufficient dopamine, the classic executive function failures emerge: difficulty initiating, difficulty sustaining, difficulty transitioning, and difficulty modulating emotional responses.

The Threshold Model: Why ADHD Is Not a Deficit

The most useful neurological reframe I offer clients — and the one that most consistently shifts their relationship to their neural indicators — is what I call the threshold model. ADHD is not a deficit of attention. It is a mismatch between the brain’s dopamine activation threshold and the stimulation level of the modern environment.

The ADHD brain is, in an important evolutionary sense, a distinct neurological variant. The genes associated with ADHD are also linked to creativity, rapid pattern recognition, and risk tolerance — features that were genuine adaptive advantages in ancestral environments. Researcher Ned Hallowell and others have argued that ADHD neuroanatomy is consistent with brains optimized for environments requiring rapid scanning, novelty detection, high-stakes response, and burst engagement — the ancestral environment of the human nervous system. That brain is genuinely disadvantaged in an environment of scheduled meetings, standardized processes, 200-email inboxes, and structured academic curricula that demand sustained attention to low-stimulation material for hours at a time.

This is not a consolation prize. It is a mechanistic explanation that changes what the intervention should look like. If ADHD were a deficit, the goal would be to fix something missing. If ADHD is a threshold mismatch, the goal is to redesign the environment so that important work consistently exceeds the activation threshold — through novelty injection, urgency creation, explicit reward proximity, or task chunking that creates frequent completion signals. The brain does not need to be fixed. The task architecture needs to meet the brain.

In practice, this distinction is transformational. One client — a senior manager who had spent decades believing she lacked discipline — realized that she had never failed to complete anything that genuinely interested her or that carried real stakes. The only things she could not finish were low-urgency, low-interest, long-timeline projects. When we redesigned her work architecture to artificially create urgency and interest through structure rather than waiting for them to occur naturally, her productivity changed within weeks. Not because she tried harder. Because her environment finally met her threshold.

How Neuroscience Reveals the True Connection Between ADHD and Dopamine

Over 26 years working with clients in my practice, I have watched neuroscience research transform our understanding of ADHD. Brain imaging studies now show us what is happening inside the brain, and the evidence is consistent: ADHD brains have structural and functional differences in the areas that produce, transport, and use dopamine.

PET and fMRI imaging reveals that ADHD brains have fewer D2 dopamine receptors available in the striatum, and higher dopamine transporter density — meaning the cleanup mechanism is more aggressive. These are not behavioral observations. They are measurable neuroanatomical differences. Research by Volkow and colleagues at the National Institutes of Health shows that this receptor pattern directly correlates with motivation impairment, not attention impairment per se.

What makes the neuroscience particularly useful in practice is the discovery of the transporter proteins that work too efficiently. These proteins — whose overactivity has a strong genetic basis linked to specific dopamine genes including DAT1 and DRD4 — sweep away dopamine from the synaptic cleft before it can fully bind to post-synaptic receptors. Stimulant interventions help by slowing this excessive clearing process, allowing the brain to actually use the signal it produces. But stimulants are not the only intervention that addresses the underlying mechanism.

I worked with a client who had spent years believing she was simply “bad at adulting.” When we mapped her specific dopamine regulation pattern — where her threshold sat, which inputs reliably exceeded it, which environments consistently fell below it — her entire orientation shifted. She stopped pathologizing her preferences and started engineering her environment. Within months, her output, her relationships, and her self-regard improved substantially — not because anything was cured, but because she was finally operating in alignment with how her brain actually works.

The Connection Between Low Dopamine and Common ADHD Struggles

When I work with clients using neuroscience-based approaches, we examine how low dopamine signaling manifests in their daily architecture. Understanding the relationship between ADHD and dopamine is essential because it explains why certain tasks feel impossible while others feel effortless — and that explanation is the foundation of any intervention that actually works.

Trouble Getting Started

Starting tasks feels impossible, even when you know they are important. This happens because your brain needs a certain level of dopamine to activate the initiation signal. Without sufficient tonic dopamine, the brain registers the task as not worth the energy — especially if the reward seems distant or the task is low-interest. This is not avoidance. It is the neurological consequence of a threshold that the task has not exceeded.

I help clients overcome this by restructuring the initiation conditions rather than demanding more willpower. One client could not start cleaning her apartment. Her first step became placing one item in the sink. That tiny action created just enough dopamine release to build momentum for the next. The principle is: lower the initiation threshold by making the first step genuinely easy, then use the momentum of completion to generate the dopamine signal for the next step.

Time Feels Slippery

People with ADHD experience time blindness — difficulty sensing how much time has passed or estimating how long tasks will take — because dopamine plays a central role in the brain’s internal timing mechanisms. The striatum, which depends on dopamine signaling, is a key node in temporal processing. When dopamine availability is inconsistent, time perception becomes unreliable.

A client who managed complex projects consistently missed deadlines despite genuine care and effort. We created external time markers — physical timers, visual schedules, calendar blocking with distinct color coding for task types. By making time visible and concrete, we gave her brain the external structure it needed to compensate for the dopamine-related timing impairment. External time structures for ADHD brains are not accommodations. They are neurological prosthetics replacing a function the internal system cannot reliably provide.

Everything Feels Boring Fast

Your brain requires novelty and stimulation to generate sufficient dopamine. Tasks that are repetitive, predictable, or slow-moving do not produce enough dopamine signal to hold the ADHD brain’s attention. This is not a character issue. It is the direct expression of a threshold that repetitive input cannot reach.

I teach clients to inject novelty into unavoidable repetitive tasks. One person paired expense reports — which she found intolerable — with podcasts that genuinely engaged her. The podcast provided supplementary stimulation that raised total dopamine output enough to sustain focus on the primary task. The pairing is not a workaround. It is environmental design for a brain that needs input to exceed its threshold.

Emotions Hit Harder

Dopamine is not only an attention molecule — it modulates the prefrontal cortex’s capacity to regulate limbic system output. When prefrontal dopamine is insufficient, emotional signals arrive at consciousness with less modulation — faster, more intense, harder to interrupt. This emotional dysregulation is a core feature of ADHD’s dopamine architecture, not a separate condition or a secondary neural signal.

A client I work with struggled with angry responses during stressful professional interactions. Through neuroscience-based mapping, we identified that dopamine fluctuations in the late afternoon — when his baseline was lowest — were the primary driver of his emotional escalations. We restructured his schedule to protect high-dopamine morning hours for relational work and low-stakes execution for the afternoon trough. The pattern largely resolved not because he managed it better, but because we stopped placing high-regulation-demand activities in the window when his regulatory capacity was at its lowest.

Natural Ways to Support Your Brain’s Dopamine System

The interventions that produce the most reliable improvement in ADHD neural indicators are those that address the dopamine system directly — raising baseline dopamine tone, reducing activation threshold, or structuring environments so that important work consistently exceeds it. None of these require pharmaceutical intervention, though some clients benefit from combining approaches.

Movement Matters More Than You Think

Exercise is one of the most evidence-supported interventions for ADHD — not because it burns energy, but because cardiovascular activity increases dopamine and norepinephrine availability, temporarily raising the dopamine tone that ADHD brains struggle to maintain at baseline. Even short bursts — ten to fifteen minutes of vigorous movement — produce measurable improvements in prefrontal function that persist for two to three hours.

I had a client who struggled with focus every afternoon. We added a ten-minute walk after lunch. Her concentration improved substantially for the remainder of her workday — not because she relaxed, but because the movement gave her prefrontal cortex the dopamine signal it needed to engage. The mechanism matters: exercise is not a calming strategy for ADHD. It is a dopamine delivery mechanism.

Build Your Personal Dopamine Menu

I work with every client to develop what I call a Dopamine Menu — a personalized architecture of activities calibrated to their specific dopamine system. The menu has three layers. Micro-Doses are 2 to 5 minute nervous system resets: a song, a brief walk, physical movement. The Sustainable Layer covers 10 to 30 minute effort-linked activities that provide reward through accomplishment — a hobby, focused reading, structured conversation. The Deep Layer contains high-meaning, high-return experiences: creative work, physical challenge, genuine social connection.

The architecture matters. ADHD brains are particularly vulnerable to collapsing into passive high-stimulation inputs during reset moments — social media, streaming, scrolling — because these inputs exceed the activation threshold with minimal effort. The Dopamine Menu replaces that default with alternatives that provide genuine dopamine without driving the receptor downregulation that passive high-stimulation inputs produce over time. For the complete framework, Chapter 8 of my forthcoming book The Dopamine Code (Simon & Schuster, June 2026) covers the full Dopamine Menu architecture in depth.

Eat Foods That Support Your Brain

Dopamine synthesis requires tyrosine — the amino acid precursor that the brain converts to dopamine through a multi-step enzymatic process. Protein-rich foods supply tyrosine: eggs, chicken, fish, legumes, and nuts. Including protein at every meal is not a dietary preference for ADHD brains. It is providing the raw material the dopamine system needs to function.

One client noticed that skipping breakfast or eating only carbohydrates in the morning made her ADHD activation patterns substantially worse by noon. Adding protein to her morning meal produced a measurable improvement in morning focus — because her brain had the substrate it needed for dopamine synthesis rather than starting the day in a deficit.

Sleep Gives Your Brain Time to Reset

Sleep is not rest for the ADHD brain — it is active restoration. During slow-wave sleep, the brain rebalances neurotransmitter levels, clears metabolic waste from the day’s neural activity, and consolidates structural changes in the reward architecture. When ADHD clients sleep poorly, their baseline dopamine tone is lower the following day, and every neural signal is harder to manage.

I have seen dramatic functional changes in clients whose primary intervention was sleep optimization. One client had persistent cognitive fog that she attributed to her ADHD. We implemented a structured sleep protocol: lights dimmed 90 minutes before bed, no screens after 9 p.m., consistent sleep and wake times even on weekends. Within two weeks, her focus and emotional regulation improved substantially — not because her ADHD changed, but because her brain finally had the dopamine restoration window it needed.

Create Rewards That Actually Motivate You

The ADHD brain requires immediate, proximal rewards to sustain motivation on important tasks. Distant rewards — a promotion in six months, a grade at the end of the semester — are neurologically insufficient. The dopamine signal that drives sustained effort needs to be close enough for the brain’s prediction system to register it as real.

I teach clients to engineer reward proximity: pair the task with an immediate reward that fires upon completion. The reward should be something genuinely anticipated — not generic praise, but something that activates your personal dopamine system. A graduate client struggling with thesis writing adopted a system of 25 minutes of writing followed by a specific reward she genuinely valued. The structure worked because the reward was real, immediate, and consistent — enough for her brain to assign the writing session sufficient motivational value to initiate.

Practice Intentional Awareness to Calm Your Busy Brain

Structured attention training — practices that ask the brain to hold focus on a single input and return when it wanders — produces measurable changes in prefrontal cortical thickness and dopamine receptor density over time. This is not passive relaxation. It is neuroplasticity exercise for the dopamine-dependent attentional circuits that ADHD specifically impairs.

Starting small is essential. I have guided clients who initially found even two minutes of focused attention practice impossible. We began with 30 seconds. The brain’s attentional circuits, like any neural architecture, respond to consistent low-load training. One client built from 30-second practices to sustainable 8-minute sessions over three months — and reported that her ability to stay with a single task before her attention fragmented measurably extended over that same period.

Strategies That Work With Your Brain’s Natural Wiring

Beyond the foundational lifestyle architecture, specific environmental design strategies address the ADHD brain’s dopamine dynamics directly. These are not coping mechanisms. They are neurological accommodations that change the functional outcome by changing the conditions the brain operates in.

Make Tasks So Small They Feel Silly

The ADHD brain cannot initiate tasks that its prediction system registers as not worth the dopamine investment. Large tasks with distant endpoints fail this threshold reliably. The solution is to make the immediate task so small that initiation is neurologically easy — a single step so minor that the brain’s cost-benefit calculation favors starting.

I teach clients to decompose until the first step produces almost no resistance. Not “clean the kitchen” but “put one dish in the dishwasher.” Not “write the report” but “open the document and type the title.” These micro-initiation steps are not simplifications. They are threshold interventions: steps small enough to generate the first dopamine signal, which then makes the next step accessible.

Use External Reminders Because Your Brain Forgets

Working memory impairment in ADHD is partly dopaminergic: the prefrontal cortex requires sufficient dopamine to hold information in active working memory across time. When dopamine is insufficient, information is not held — it drops. External systems are not signs of disorganization. They are the appropriate response to a neurological reality.

I routinely help clients design external memory architectures: alarms, visual schedules, landing zones, and calendar structures that remove the burden from working memory entirely. One client who constantly lost her keys, wallet, and phone created a single designated entry zone where these items always landed. The system freed her working memory for higher-order tasks instead of burning capacity on item retrieval.

Body Doubling Creates Instant Accountability

Body doubling — working alongside another person, in person or virtually — is one of the most effective and underappreciated ADHD interventions. The mechanism is dopaminergic: social presence creates mild arousal, and arousal increases dopamine tone. The other person does not need to be engaged in the same task. They simply need to be present, visible, and sharing the space of sustained work.

I have seen this produce results that surprised even skeptical clients. One worked remotely and struggled severely with task initiation. She joined a virtual coworking group with cameras on. The presence of others working was sufficient to sustain her focus for substantially longer periods — not because of accountability pressure, but because social presence raised her baseline dopamine enough to exceed the task initiation threshold.

Time Blocking Tames Time Blindness

Making time externally visible addresses the internal clock impairment that dopamine irregularity produces in ADHD. Time blocking assigns explicit time windows to specific tasks and uses visible timers to mark those windows in real time. The Pomodoro Technique — 25-minute work intervals with scheduled breaks — works for many ADHD brains because it creates frequent completion signals (each 25-minute block is a discrete finish) and regular reward moments (each break is a scheduled reinforcement).

Embrace Your Hyperfocus Superpower

Hyperfocus is the ADHD brain’s most misunderstood feature. It is the same threshold mechanism operating in the opposite direction: when a task exceeds the dopamine activation threshold, the system does not just engage — it locks. Attention becomes total and sustained. Time disappears. Output quality peaks. This is not a different capacity than the ADHD brain struggles with in ordinary tasks. It is the same capacity, finally operating in conditions that meet its requirements.

I worked with a developer who hyperfocused on coding but resisted documentation. We designed his schedule so that coding — his natural hyperfocus domain — was protected during his highest-dopamine morning window, while documentation was scheduled in shorter blocks with explicit timer constraints during periods when hyperfocus was less likely to activate. He did not change his hyperfocus. We changed when and where it was deployed.

What Real-Time Neuroplasticity™ Looks Like in ADHD Practice

The approaches described above address the ADHD brain’s dopamine architecture through environmental design. They work — and in my practice, clients who implement them consistently see significant improvement in initiation, sustained attention, time management, and emotional regulation. But environmental design alone addresses the neural signals at the surface level.

What I work on at a deeper level is the neural architecture underlying the threshold problem. Real-Time Neuroplasticity™ intervenes in the live moment — when an ADHD client is in the actual experience of threshold failure, not in a session reviewing it retrospectively. The brain is most receptive to rewiring during the moment of the pattern itself, not in a neutral discussion afterward.

In practice, this means working with a client when she is in the paralysis of a task initiation failure, not discussing it later. It means identifying the exact neural sequence — the moment the reward system evaluates the task, finds it below threshold, and begins generating the avoidance signal — and intervening at that moment to redirect the circuitry. Over repeated real-time interventions, the evaluation sequence itself changes. The threshold for the specific task category lowers. What required an external structure to initiate eventually becomes internally accessible.

I had a client — a senior professional with a 20-year history of ADHD and a lifetime of failed behavioral interventions — who came to my practice having tried every productivity system available. None had held. The problem was not the systems. It was that all of them required her to implement the correct behavior before her brain had the dopamine signal that would make the correct behavior feel possible. Real-Time Neuroplasticity™ reverses the sequence: the neural work happens in the live moment, at the point of threshold failure, rather than asking willpower to override a system that has not yet changed.

Managing Emotions When Dopamine Runs Low

Emotional dysregulation is one of the most underacknowledged dimensions of ADHD that my clients bring to practice. When the prefrontal cortex lacks sufficient dopamine to modulate limbic output, emotional responses arrive faster, more intensely, and with less of the delay that enables considered response rather than immediate reaction.

Name Your Feelings to Tame Them

Affect labeling — explicitly naming the emotion as it arises — activates the ventrolateral prefrontal cortex and reduces amygdala response, a mechanism documented in research by Matthew Lieberman at UCLA. For ADHD brains, this is not a wellness technique. It is a neurological interrupt: temporarily engaging a different cortical circuit that has regulatory influence over the emotional signal.

A client who experienced intense reactivity in professional settings learned to name the emotion internally the moment she noticed it rising: “frustration at the ambiguity” or “anxiety about the timeline.” The naming created just enough delay — and just enough prefrontal engagement — for her response to shift from immediate reaction to considered response.

Develop a Pause Practice

Creating a gap between emotional onset and behavioral response gives the prefrontal cortex time to engage. For ADHD brains, this gap does not happen automatically — it needs to be engineered as an explicit behavioral step. I teach a breathing sequence that activates the parasympathetic nervous system: inhale four counts, hold four, exhale six. The extended exhale is the regulatory mechanism — it directly activates the vagal brake on the stress response.

Build Your Personal Calming Toolkit

Every client I work with develops a pre-identified set of regulatory strategies that match their own nervous system — physical, sensory, or cognitive. The critical design principle is that these strategies are identified and practiced in a regulated state, not improvised during an escalation. When dopamine is low and emotional intensity is high, the brain does not have the executive resources to generate novel coping strategies. It needs a practiced protocol it can execute without deliberation.

Understanding What Makes You Different Makes You Stronger

The most consistent shift I see in clients who understand the dopamine threshold model is the dissolution of shame. When the pattern is a neurological mismatch — not a character failure — the energy that was going into self-criticism becomes available for environmental redesign.

ADHD brains make lateral connections that more convergent thinkers miss. They generate novel solutions under pressure. They hyperfocus when something genuinely matters. They adapt rapidly when the environment changes. These are not compensations for the deficit — they are the same architectural features that produce the challenges, operating in conditions that happen to suit them.

I worked with a client who spent years believing his ADHD was the reason his career had never reached its potential. When we mapped his actual performance history, the picture that emerged was different: he had consistently produced his best work in high-stakes, high-novelty environments. His career stagnated specifically in roles that required sustained execution of established processes. He was not underperforming. He was in the wrong architecture. Reorienting his career toward roles that matched his neurological strengths — not despite his ADHD but because of it — changed everything.

This article explains the neuroscience underlying ADHD and dopamine. For personalized neurological assessment and intervention, contact MindLAB Neuroscience directly.

Moving Forward With Clarity and Science

Managing ADHD is not about trying harder. It is about understanding how your brain uses dopamine differently and building the environmental architecture that works in alignment with that reality rather than against it.

Progress happens through consistent structural changes — adjustments to environment, to schedule architecture, to reward proximity, and over time, to the neural circuitry itself. The work is not about eliminating ADHD. It is about closing the gap between the brain you have and the environment you operate in.

The ADHD brain does not lack capacity. It lacks the dopamine signal that activates capacity on demand. That is a solvable problem — not through willpower, but through architecture.

The ADHD brain is not deficient — it is differently calibrated. It was built for environments that demanded rapid response to novel, high-stakes stimuli. The struggle is not with the brain; it is with a modern world that rewards sustained attention to low-dopamine tasks the brain was never designed to prioritize.

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References

1. Volkow, N. D., et al. (2009). Evaluating dopamine reward pathway in ADHD: Clinical implications. JAMA, 302(10), 1084-1091. DOI
2. Castellanos, F. X., & Proal, E. (2012). Large-scale brain systems in ADHD: Beyond the prefrontal-striatal model. Trends in Cognitive Sciences, 16(1), 17-26. DOI
3. Sonuga-Barke, E. J. S. (2005). Causal models of attention-deficit/hyperactivity disorder. Biological Psychiatry, 57(11), 1231-1238. DOI

Understanding ADHD’s dopamine signature requires seeing where it fits within the full neurotransmitter system. Learn more about the broader neurotransmitter architecture underlying attention and reward.

Frequently Asked Questions

The ADHD brain does not lack capacity — it lacks the dopamine signal that activates capacity on demand. Real-Time Neuroplasticity™ intervenes at the activation threshold: building environmental and neural structures that generate sufficient dopamine signal for the prefrontal cortex to engage, without requiring the external urgency or crisis that ADHD brains typically depend on.

If the pattern described in this article — knowing what to do but being unable to start, hyperfocusing on the wrong things while important tasks go unstarted, emotional responses that outpace your ability to regulate them — has become your daily architecture, the dopamine circuitry sustaining that pattern is identifiable and addressable. A strategy call with Dr. Ceruto maps the specific reward and attention circuits driving the experience.