Webb Therapy Uncategorized The ‘Triune Brain’ theory by Neuroscientist Paul MacLean — an evolutionary perspective

The ‘Triune Brain’ theory by Neuroscientist Paul MacLean — an evolutionary perspective

The Concept of the "Triune Brain"

In the 1960s, American neuroscientist Paul MacLean formulated the ‘Triune Brain’ model, which is based on the division of the human brain into three distinct regions. MacLean’s model suggests the human brain is organized into a hierarchy, which itself is based on an evolutionary view of brain development. The three regions are as follows:

  1. Reptilian or Primal Brain (Basal Ganglia)
  2. Paleomammalian or Emotional Brain (Limbic System)
  3. Neomammalian or Rational Brain (Neocortex)

At the most basic level, the brainstem (Primal Brain) helps us identify familiar and unfamiliar things. Familiar things are usually seen as safe and preferable, while unfamiliar things are treated with suspicion until we have assessed them and the context in which they appear. For this reason, designers, advertisers, and anyone else involved in selling products tend to use familiarity as a means of evoking pleasant emotions.

Related Post

Polyvagal Theory and Trauma – Dr. Stephen PorgesPolyvagal Theory and Trauma – Dr. Stephen Porges

Stephen Porges, psychiatry professor and researcher, on the polyvagal theory he developed to understand our reactions to trauma:

[Paraphrased] Polyvagal theory articulates three branches of the autonomic nervous system (ANS) that evolved from primitive vertebrates to mammals. First, there is a system known as ‘freeze’, which involves death feigning or immobilisation. Second, the ANS has a ‘fight or flight’ system, which is a mobilisation system. And third, with mammals, there is what Porges calls, a social engagement system (SES), which can detect features of safety, and actually communicate them to another. The SES may also be referred to by some as ‘rest and digest’, which Porges theory suggests is a function of the Vagus Nerve – the tenth cranial nerve, a very long and wandering nerve that begins at the medulla oblongata. When an individual experiences feelings of safety (within an SES state), the autonomic nervous system can support health restoration. In terms of dealing with a life threat, an ordinary person will most likely go into a feigning death, dissociative state of ‘freeze’.

Polyvagal theory in psychotherapy offers emotional co-regulation as an interactive process between therapist and client which engages the social engagement system of both therapist and client. Social engagement provides experiences of safety, trust, mutuality and reciprocity in which we are open to receiving another person, just as they are.

The following extract has been retrived from https://www.theguardian.com/society/2019/jun/02/stephen-porges-interview-survivors-are-blamed-polyvagal-theory-fight-flight-psychiatry-ace

Polyvagal theory has made inroads into medical and psycho-therapeutic treatment, but how should it inform how people treat each other?


“When we become a polyvagal-informed society, we’re functionally capable of listening to and witnessing other people’s experiences, we don’t evaluate them. Listening is part of co-regulation: we become connected to others and this is what I call our biological imperative. So when you become polyvagal-informed you have a better understanding of your evolutionary heritage as a mammal. We become aware of how our physiological state is manifested, in people’s voices and in their facial expression, posture and basic muscle tone. If there’s exuberance coming from the upper part of a person’s face, and their voice has intonation modulation or what’s called prosody, we become attracted to the person. We like to talk to them – it’s part of our co-regulation.

So when we become polyvagal-informed, we start understanding not only the other person’s response but also our responsibility to smile and have inflection in our voice, to help the person we’re talking to help their body feel safe.”

Clink on the link below to hear Dr. Bessel van der Kolk, one of the world’s leading experts on developmental trauma, explain how our long-term health and happiness can be compromised by prior exposure to violence, emotional abuse, and other forms of traumatic stress.

https://youtu.be/53RX2ESIqsM

Thinking About Change? How Motivational Interviewing Can HelpThinking About Change? How Motivational Interviewing Can Help

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.