Why Behavior Isn’t Always What It Seems

One of the biggest lessons I’ve learned over nearly three decades in mental health is that behavior rarely has a single explanation.

As clinicians, educators, parents, and even friends, we’re naturally inclined to make sense of what we observe. We see someone struggling, withdrawing, becoming irritable, forgetting things, or acting differently than usual, and our brains immediately begin searching for an explanation.

Sometimes those explanations are accurate.

Sometimes they’re incomplete.

Behavior is often the most visible part of a much larger process taking place beneath the surface.

The same person can function remarkably differently depending on what they’re carrying, how their nervous system is functioning, and the environment they’re navigating. A person who appears calm, organized, and highly capable one week may seem distracted, forgetful, emotionally reactive, or overwhelmed the next—not because they have become a different person, but because the conditions influencing their functioning have changed.

This is one of the ideas that led me to develop the Bandwidth Model™.

Rather than asking only, “What’s wrong?”, I find it more useful to ask:

What factors are influencing this person’s available bandwidth right now, and how have repeated experiences shaped the way they adapt over time?

That shift in perspective has fundamentally changed how I think about behavior.

Meet Sarah

Imagine Sarah.

Sarah is a successful attorney with ADHD.

She’s intelligent, dependable, and respected by her colleagues. She has spent years developing systems that allow her to succeed in an incredibly demanding profession. Her calendar is meticulously organized. She relies on reminders, routines, and carefully structured workflows. She’s learned where she struggles and has built supports around those areas.

Most people simply see competence.

They don’t see the amount of planning, effort, and mental energy required to maintain it.

Then Sarah receives a phone call.

Her grandmother has suffered a massive stroke.

Within days, Sarah’s world changes.

She spends long hours at the hospital.

She helps make medical decisions.

She comforts grieving family members.

She sleeps poorly.

She continues trying to meet the expectations of an already demanding career.

By the end of the week, things begin to unravel.

She rereads emails multiple times because they don’t seem to stick.

She loses her train of thought during conversations.

She forgets appointments.

Simple decisions suddenly require enormous effort.

She finds herself emotionally exhausted by tasks that would normally feel routine.

A coworker quietly remarks,

“She’s really falling apart.”

It’s an understandable observation.

But is it the most accurate one?

Looking Beneath the Surface

From a Bandwidth Model™ perspective, Sarah hasn’t suddenly become less intelligent.

She hasn’t lost her abilities.

She has temporarily lost access to some of them.

That distinction matters.

Research has consistently demonstrated that stress, sleep disruption, emotional demands, and executive functioning interact to influence cognitive performance. Under conditions of sustained stress, working memory, attention, cognitive flexibility, emotional regulation, and decision-making can all become less efficient—even in highly capable individuals (Arnsten, 2009; Diamond, 2013; McEwen & Morrison, 2013).

In other words, our potential doesn’t necessarily disappear.

Our ability to consistently access that potential can fluctuate.

Within the Bandwidth Model™, I describe this as changes in available bandwidth—the cognitive, emotional, behavioral, and physiological resources available to meet the demands of a particular moment.

This helps explain why someone may know exactly what they need to do yet struggle to do it.

It helps explain why bright, motivated people sometimes forget appointments, lose words, become emotionally reactive, or find routine tasks unexpectedly overwhelming.

These experiences are often interpreted as laziness, poor motivation, carelessness, or lack of effort.

Sometimes they’re better understood as changes in available bandwidth.

Today’s Functioning Is Only Part of the Story

But understanding today’s bandwidth still doesn’t tell us the whole story.

People don’t simply respond to life.

They adapt to it.

Over months and years, repeated interactions among our neurodevelopment, relationships, environments, stressors, successes, failures, and learning experiences gradually shape how we approach the world.

Returning to Sarah…

Living with ADHD hasn’t only influenced how she functions today.

It has also influenced how she has learned to navigate life.

She overprepares.

She creates detailed systems.

She double-checks her work.

She apologizes when she’s struggling.

She hesitates to ask for help.

She often feels responsible for holding everything together.

These are not simply symptoms.

Nor are they necessarily personality traits.

Within the Bandwidth Model™, I describe them as adaptive patterns—relatively enduring ways of thinking, feeling, behaving, and relating that emerge through repeated interactions among neurodevelopment, available bandwidth, relationships, learning, and lived experience.

Adaptive patterns are not inherently good or bad.

Many begin as remarkably effective solutions.

Perfectionism may improve performance.

Hyper-independence may help someone survive environments where support was inconsistent.

Overpreparing may reduce mistakes and anxiety.

People often succeed because of these adaptations.

The challenge is that strategies that were once adaptive can also become costly.

Perfectionism can contribute to burnout.

Hyper-independence can make accepting help feel uncomfortable.

Constant overpreparation can consume enormous amounts of cognitive and emotional energy.

The same adaptation that once protected us may eventually limit us.

This idea is supported by decades of work in attachment theory, cognitive theory, developmental psychology, and learning research, all of which recognize that repeated experiences shape enduring patterns of responding (Beck, 2011; Bowlby, 1988).

The Bandwidth Model™ attempts to organize these ideas into a single framework that considers both what is happening today and how today’s responses have been shaped over time.

Why This Perspective Matters

One of the risks in mental health—and in everyday life—is reducing people to quick conclusions.

Lazy.

Unmotivated.

Difficult.

Too emotional.

Not trying hard enough.

Even diagnoses themselves, while incredibly valuable, can sometimes become oversimplified explanations if we stop asking additional questions.

A diagnosis tells us something important.

It rarely tells us everything.

The Bandwidth Model™ encourages us to think more broadly.

Instead of asking,

“What’s wrong with Sarah?”

I find it more helpful to ask,

“What is influencing her available bandwidth today?”

And then,

“How have years of adaptation shaped the adaptive patterns we see now?”

Those questions often lead to a deeper understanding of behavior.

They remind us that today’s functioning reflects far more than today’s circumstances alone.

They encourage curiosity instead of assumption.

Compassion instead of judgment.

Clinical formulation instead of premature conclusions.

Most importantly, they acknowledge something that many people intuitively know from their own lives:

Sometimes we are capable of extraordinary things.

Sometimes we struggle with tasks that normally feel effortless.

Those differences don’t necessarily reflect who we are.

Sometimes they reflect the complex interaction between our nervous system, our experiences, and the demands placed upon us in that moment.

Understanding those interactions doesn’t remove personal responsibility.

It improves the accuracy of our understanding.

And I believe better understanding is one of the foundations of better care.

The Bandwidth Model™ is my original, evidence-informed conceptual framework for understanding how neurodevelopmental architecture, cumulative load, physiological state, processing demands, environmental fit, recovery, and executive access interact to influence day-to-day functioning. It has not yet been empirically evaluated.

Darcy Stephens, LPCC

References

American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). American Psychiatric Association. https://doi.org/10.1176/appi.books.9780890425787

Arnsten, A. F. T. (2009). Stress signalling pathways that impair prefrontal cortex structure and function. Nature Reviews Neuroscience, 10(6), 410–422. https://doi.org/10.1038/nrn2648

Beck, J. S. (2011). Cognitive behavior therapy: Basics and beyond (2nd ed.). Guilford Press. (No DOI assigned.)

Bowlby, J. (1988). A Secure Base: Parent-Child Attachment and Healthy Human Development. Basic Books. (No DOI assigned.)

Diamond, A. (2013). Executive functions. Annual Review of Psychology, 64, 135–168. https://doi.org/10.1146/annurev-psych-113011-143750

Faraone, S. V., Asherson, P., Banaschewski, T., et al. (2021). The World Federation of ADHD International Consensus Statement: 208 evidence-based conclusions about ADHD. Neuroscience & Biobehavioral Reviews, 128, 789–818. https://doi.org/10.1016/j.neubiorev.2021.01.022

McEwen, B. S., & Morrison, J. H. (2013). The brain on stress: Vulnerability and plasticity of the prefrontal cortex over the life course. Neuron, 79(1), 16–29. https://doi.org/10.1016/j.neuron.2013.06.028

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