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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When our intelligent and necessary emotion – ANGER – becomes unhealthy and damagingWhen our intelligent and necessary emotion – ANGER – becomes unhealthy and damaging

The function of anger is to protect vulnerability and neutralize threat.

The threat humans cognitively perceive is almost always to the ego i.e., how we want to think of ourselves and have others think of us. Anger neutralizes ego-threat by devaluing, demeaning, or undermining the “power” of the person perceived to be threatening. Humans get angry when they don’t get what they want, when they’re disrespected, or when they perceive something is unjust/unfair. Anger, the emotion, is a chemical messenger. It communicates to us, to others, and motivates us to act, speak, do something. Healthy responses to anger include being assertive, feeling empowered, protecting ourselves and love ones from ACTUAL threat, setting boundaries with others, and making social change for justice (for example). It becomes unhealthy when we become passive-aggressive, violent, vengeful, spiteful, aggressive, resentful, sarcastic, “moody”, rude etc.

Receive the message and respond from a wise, calm place after the intensity of the emotion has past. Sometimes we have to act in the moment. Our ancestors may have required this for fight/flight survival. These days, we can generally PAUSE and calm the self before responding from a mindful and compassionate heart and mind. Remember: Hurt people, hurt people.

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.

Eating Disorders DSM-5Eating Disorders DSM-5

Psychologists believe that the core issues of anorexia nervosa and bulimia nervosa are multifaceted, involving a combination of biological, psychological, and social factors. Here are some of the key issues:

Anorexia Nervosa

  1. Distorted Body Image: Individuals with anorexia often have a distorted perception of their body size and shape, seeing themselves as overweight even when they are underweight.
  2. Intense Fear of Gaining Weight: There is an overwhelming fear of gaining weight or becoming fat, which drives restrictive eating behaviors.
  3. Control Issues: Anorexia can be a way for individuals to exert control over their lives, especially if they feel powerless in other areas.
  4. Perfectionism: Many individuals with anorexia have perfectionistic tendencies, striving for an unattainable ideal of thinness.
  5. Emotional Regulation: Restricting food intake can be a way to manage or numb difficult emotions and stress.

Bulimia Nervosa

  1. Binge-Purge Cycle: Bulimia is characterized by cycles of binge eating followed by purging behaviors such as vomiting, excessive exercise, or misuse of laxatives.
  2. Body Dissatisfaction: Similar to anorexia, individuals with bulimia often have a negative body image and are preoccupied with their weight and shape.
  3. Impulsivity: Bulimia is often associated with impulsive behaviors and difficulties in regulating emotions.
  4. Shame and Guilt: After binge eating, individuals with bulimia often feel intense shame and guilt, which perpetuates the cycle of purging3.
  5. Co-occurring Mental Health Issues: Anxiety, depression, and other mental health disorders are commonly seen in individuals with bulimia.

Both disorders are complex and can have severe physical and psychological consequences. Treatment typically involves addressing these core issues through therapy, medical monitoring, nutritional counselling, and support groups.