Polyvagal Theory and Trauma – Dr. Stephen Porges

Abstract

Addiction is a complex, multifaceted phenomenon that has been described variously as a disease, disorder, syndrome, obsessive-compulsive behaviour, learned behaviour, or spiritual malady. Modern scientific understanding emphasises addiction as a chronic brain disorder shaped by neurobiological changes, learning, and social context. This article examines each conceptualisation and presents an integrated definition that aligns with current neuroscience, psychological, and public health evidence.

Conceptualising Addiction: Labels and Their Accuracy

No single label fully captures addiction’s complexity; each highlights certain truths while overlooking others.

Disease

From a medical perspective, disease is the closest match. Addiction involves persistent neurobiological changes in reward, stress, and self-control circuits, increases relapse risk over years, and shows substantial genetic vulnerability (~50–60%) (NIDA, 2018; Heilig et al., 2021). Treatments improve outcomes but rarely “cure” the condition. This framing is used by the American Society of Addiction Medicine (ASAM), NIDA, WHO ICD-11, and DSM-5-TR (as “Substance Use Disorder”) (NIDA, 2018).

Disorder

Disorder is also scientifically accurate and slightly less medicalised. DSM-5’s “Substance Use Disorder” captures behavioural, psychological, and biological criteria and recognises functioning and harm rather than framing addiction strictly as a lifelong disease (Heather, n.d.; Heilig et al., 2021).

Syndrome

Addiction may be described as a syndrome because it is a cluster of symptoms with behavioural and physiological manifestations, without a single causative factor. However, the term is too generic for practical use outside clinical texts (Blithikioti et al., 2025).

Obsessive and Compulsive Learned Behaviour

Addiction involves learning, habit formation, and compulsion through reinforcement of rewarding behaviours (Hyman, 2005; Hausotter, 2013). Yet describing it solely as learned behaviour ignores genetic predisposition, neuroadaptation, withdrawal, and social factors.

Spiritual Malady

Some mutual-aid traditions characterise addiction as a spiritual malady. While this may be meaningful for individuals, it is not scientifically explanatory: addiction can be adequately explained via biological, psychological, and social mechanisms (Lewis, 2017).

Modern Integrative Definition

The most accurate contemporary description of addiction is:
“A chronic, relapsing disorder of brain circuits involved in reward, stress, and self-control, shaped by learning, environment, and social context”.

This definition encompasses:

• Disease/disorder: medical accuracy
• Learned behaviour and compulsion: neuroscience and behavioural accuracy
• Social determinants: public health relevance
• Flexibility for personal or spiritual interpretations

In short, addiction is best understood as a bio-psycho-social condition that is treatable and sometimes reversible, rather than a deterministic, lifelong curse.

Neurobiology: Why Addiction Is Considered a Brain Disorder

Repeated substance use alters structural and functional brain circuits involved in reward, stress, motivation, memory, and self-control (Nwonu et al., 2022; NIDA, 2018). These changes can persist long after use stops, explaining why addiction is more than a matter of “bad habits” or weak will (NIDA, 2025).

Chronicity and Relapse

Addiction is often chronic and relapsing. Even after long periods of abstinence, cues and stressors can trigger relapse (Meurk et al., 2014; SAMHSA, 2023). Key regions implicated include the basal ganglia (habit formation), extended amygdala (stress), and prefrontal cortex (decision-making) (Kirby et al., 2024). Nevertheless, many individuals achieve stable remission, highlighting heterogeneity in clinical outcomes (Heilig et al., 2021).

Learning, Memory, and Habit Formation

Addiction exploits neural mechanisms of learning and memory: rewarding behaviours are repeated and consolidated into habits, with cues triggering compulsive responses even when the substance’s reward diminishes (Hausotter, 2013; Lewis, 2017). This intertwines biological disorder and learned behaviour.

Critiques and Limitations

Some scientists caution that framing addiction strictly as a brain disease is simplistic:

• Brain changes may resemble those from other motivated behaviours (Lewis, 2017).
• Many recover without formal treatment (Heilig et al., 2021).
• Social, environmental, and psychological factors are crucial to understanding addiction (Blithikioti et al., 2025).

Thus, while the disease model is powerful, it does not fully represent addiction’s heterogeneity or socio-psychological dimensions.

Implications for Treatment

Addiction is treatable, not simply curable. Interventions combining pharmacological and behavioural approaches, alongside social support, can foster long-term recovery (Liu & Li, 2018; Heilig et al., 2021). Like other chronic conditions, management — rather than elimination — is often the realistic goal (NIDA, 2018). Neural circuits can gradually readjust, particularly when environmental and personal factors support recovery.

Conclusion

Addiction is a learned, compulsive brain disorder with chronic potential, shaped by neurobiological, psychological, social, and environmental factors. Recognising addiction as both a disorder and a behavioural learning condition avoids extremes: it is neither an unchangeable fate nor merely a moral failing. This integrated perspective supports nuanced understanding, compassionate care, and effective treatment strategies.

References

Blithikioti, C., Fried, E. I., Albanese, E., Field, M., & Cristea, I. A. (2025). Reevaluating the brain disease model of addiction. The Lancet Psychiatry, 12(6), 469–474. https://doi.org/10.1016/S2215-0366(25)00060-4

Hausotter, W. (2013). Neuroscience and understanding addiction. Addiction Technology Transfer Center (ATTC) Network. https://attcnetwork.org/neuroscience-and-understanding-addiction

Heather, N. (n.d.). What’s wrong with the brain disease model of addiction (BDMA)? Addiction Theory Network. https://addictiontheorynetwork.org/brain-disease-model-of-addiction

Heilig, M., MacKillop, J., Martinez, D., Rehm, J., Leggio, L., & Vanderschuren, L. J. M. J. (2021). Addiction as a brain disease revised: Why it still matters, and the need for consilience. Neuropsychopharmacology, 46(10), 1715–1723. https://doi.org/10.1038/s41386-020-00950-y

Hyman, S. E. (2005). Addiction: A disease of learning and memory. The American Journal of Psychiatry, 162(8), 1414–1422. https://doi.org/10.1176/appi.ajp.162.8.1414

Kirby, E. D., Glenn, M. J., Sandstrom, N. J., & Williams, C. L. (2024). Neurobiology of addiction (Section 14.5). In Introduction to Behavioral Neuroscience. OpenStax. https://socialsci.libretexts.org/…/14.05:_Neurobiology_of_Addiction

Leshner, A. I. (1997). Addiction is a brain disease, and it matters. Science, 278(5335), 45–47. https://doi.org/10.1126/science.278.5335.45

Lewis, M. (2017). Addiction and the brain: Development, not disease. Neuroethics, 10(1), 7–18. https://doi.org/10.1007/s12152-016-9293-4

Liu, J. F., & Li, J. X. (2018). Drug addiction: A curable mental disorder? Acta Pharmacologica Sinica, 39(12), 1823–1829. https://doi.org/10.1038/s41401-018-0180-x

Meurk, C., Carter, A., Partridge, B., Lucke, J., & Hall, W. (2014). How is acceptance of the brain disease model of addiction related to Australians’ attitudes towards addicted individuals and treatments for addiction? BMC Psychiatry, 14, 373. https://doi.org/10.1186/s12888-014-0373-x

National Institute on Drug Abuse. (2018). Drugs, brains, and behavior: The science of addiction (Rev. ed.). https://irp.nida.nih.gov/…/NIDA_DrugsBrainsAddiction

Nwonu, C. N. S., Nwonu, P. C., & Ude, R. A. (2022). Neurobiological underpinnings in drug addiction. West African Journal of Medicine, 39(6), 874–884. https://pubmed.ncbi.nlm.nih.gov/36063103

Substance Abuse and Mental Health Services Administration. (2023). What is substance use disorder? U.S. Department of Health and Human Services. https://www.samhsa.gov/substance-use/what-is-sud

If you’ve ever found yourself thinking “Part of me wants to change… but part of me’s not sure”, you’re not alone. That back-and-forth, weighing things up—“Should I? Shouldn’t I?”—is a normal part of how people process big (and small) decisions. In counselling, this is called ambivalence, and rather than seeing it as a barrier, Motivational Interviewing (MI) treats it as a starting point for meaningful conversations.

What Is Motivational Interviewing?

Motivational Interviewing is a counselling approach that helps people explore their own reasons for change, without pressure or judgment. It’s a respectful, supportive way of helping you work through the push-pull that often comes with making decisions. You’re in the driver’s seat—we’re just here to help you navigate.

You might hear MI described in different ways:

In simple terms:
“MI is a collaborative conversation style that helps strengthen your own motivation and commitment to change.”

In practice:
“MI is about helping you make sense of mixed feelings and explore what’s right for you—based on your values, your goals, and your life.”

MI isn’t about telling you what to do. It’s about listening deeply, asking thoughtful questions, and helping you make sense of where you’re at—and where you might want to go.

Why It’s Not Just a Quick Fix

While MI can be used in short sessions, the research shows it works best when there’s time to really explore your thinking. In studies where people had just one 15-minute session, the outcomes were decent. But when they had more time—say, several sessions of an hour—the results were much stronger. That’s probably because real change often takes time, reflection, and a bit of back-and-forth.

MI originally started in the health world—helping people reduce alcohol use, manage weight, or improve their health. More recently, it’s been used to address things like vaccine hesitancy. But MI isn’t just for health issues. It can also help with things like relationship struggles, career decisions, or anything where you might feel stuck or unsure.

Ambivalence Is Normal

Let’s say you’re thinking about quitting smoking, leaving a relationship, or starting something new. You might feel torn—part of you is ready, and another part isn’t. That’s ambivalence.

MI offers tools to help with this, including something called the Decisional Balance, which simply helps you look at both sides: What are the good things about staying the same? What are the reasons you might want to change?

But here’s the thing—MI isn’t about pushing you toward a particular outcome. If you’re trying to make a decision where there’s no obvious “right” answer—like whether to stay in a relationship—the counsellor stays neutral. They don’t steer you in one direction. Instead, they help you explore what matters to you.

Talking Your Way Toward Change

One of the interesting things about MI is how it pays attention to the language you use when you talk about change.

Some of the things people say when they’re starting to think about change include:

• “I probably should cut down…”
• “I’d like to feel better about this…”
• “I don’t know if I can keep doing this…”

These kinds of statements are called change talk—and they’re actually signs that something inside you is shifting. MI aims to gently encourage and grow this kind of talk, because research shows that the more someone talks about change, the more likely they are to act on it.

There’s also sustain talk, which sounds like:

• “I don’t smoke that much…”
• “I know I should, but it helps me relax.”
• “Now’s not really the right time.”

Both are normal. In MI, there’s no need to rush. Instead, the focus is on listening to both sides of you—and helping you get clearer about what you want to do next.

Getting Skilled Support

Like any professional approach, MI works best when the counsellor is trained and skilled in using it. Some practitioners have their sessions reviewed (with consent) by independent experts to make sure the spirit and skills of MI are being used well.

If you ever hear a practitioner say they “do MI”, you can ask what that looks like. The most effective use of MI goes beyond just asking open-ended questions or offering summaries—it’s about how your counsellor supports you in finding your own reasons for change.

What a Session Might Involve

Motivational Interviewing tends to follow a flexible process with four key parts:

1. Engaging – Building trust and understanding
2. Focusing – Exploring what matters most to you
3. Evoking – Drawing out your own reasons for change
4. Planning – When you’re ready, looking at possible next steps

You don’t have to go through these in a straight line. Some days you might focus on one step, then circle back to another later. It’s all guided by you—your pace, your readiness, your goals.

In Summary

If you’re feeling uncertain about making a change—or you’ve been thinking about it for a while but haven’t quite landed on what to do—Motivational Interviewing could be a really helpful way to explore things.

It’s not about being told what to do, and it’s not about “fixing” you. It’s a respectful, evidence-based approach that helps people work through their own ambivalence, connect with what matters to them, and move toward change when they’re ready.

Change doesn’t have to be instant. And it doesn’t have to be perfect. But it can start with a conversation.