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.

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Three rules for identifying abnormal child sexual behavioursThree rules for identifying abnormal child sexual behaviours

Retrieved and edited 06/12/2021 from “Voice of Experience: Three rules for identifying abnormal child sexual behaviors” by Gregory K. Moffatt, a veteran counsellor with more than 30 years experience. If you are a survivor of sexual trauma at any age, I encourage you not to read this article.

From the perspective of Moffatt’s professional experience, childhood sexual behaviours can be grouped into three categories: 1. normal behaviours, 2. behaviours that are not normal but not unusual, and 3. behaviours that are abnormal or statistically rare. For the purpose of this post, I will be replacing the word “normal” with “natural” and/or “common” moving forward.


Rule No. 1: Natural or common sexual behaviours in children are never forced. The exploration is mutual. While one child likely had the idea first, both children must participate freely. This doesn’t mean that two children might willingly agree to engage in abnormal sexual behaviours, however, therefore read the next to rules for clarification.


Rule No. 2: Natural or common sexual behaviours in children are never painful. Children who behave within cultural and developmental norms will stop what they are doing when they realise they have caused pain.


Rule No. 3: Natural or common sexual behaviour in children is never invasive. Natural childhood curiosity does not include inserting objects or one’s own body parts into the cavities of others — anus, vagina, mouth, etc.


I’m unsure why Moffatt didn’t make this a 4th rule – he did add that most of the time, this type of childhood behaviour occurs between children of similar age. It is highly unusual for a young child to sexually engage with a teen without violating one of the three rules above. That behaviour definitely calls for further investigation. And, certainly, any sexual interaction between an adult and a child is cause for mandated reporting.

Fear and Love, with Tara BrachFear and Love, with Tara Brach

I strongly encourage viewers, readers, and interested friends to visit Tara’s website Tara Brach – Meditation, Psychologist, Author, Teacher. So much of what I consider to be true and helpful is the wisdom I have learned from Tara Brach, an American psychologist, author, and proponent of Buddhist meditation – but more than that, she is authentic, compassionate and honest.