The Evolutionary Layers of the Human Brain

THE EVOLUTIONARY LAYERS OF THE HUMAN BRAIN

The first time you observe the anatomy of the human brain, its many folds and overlapping structures can seem very confusing, and you may wonder what they all mean. But just like the anatomy of any other organ or organism, the anatomy of the brain becomes much clearer and more meaningful when you examine it in light of the evolutionary processes that created it. The most efficient model for understanding the brain in terms of its evolutionary history is the famous triune brain theory developed by Paul MacLean. According to this theory, the following three distinct brains emerged successively in the course of evolution and now co-inhabit the human skull: The reptilian brain, the oldest of the three, controls the body’s vital functions such as heart rate, breathing, body temperature and balance. Our reptilian brain includes the main structures found in a reptile’s brain: the brainstem and the cerebellum. The reptilian brain is reliable but tends to be somewhat rigid and compulsive. The limbic brain emerged in the first mammals. It can record memories of behaviours that produced agreeable and disagreeable experiences, so it is responsible for what are called emotions in human beings. The main structures of the limbic brain are the hippocampus, the amygdala, and the hypothalamus. The limbic brain is the seat of the value judgments that we make, often unconsciously, that exert such a strong influence on our behaviour. The neocortex first assumed importance in primates and culminated in the human brain with its two large cerebral hemispheres that play such a dominant role. These hemispheres have been responsible for the development of human language, abstract thought, imagination, and consciousness. The neocortex is flexible and has almost infinite learning abilities. The neocortex is also what has enabled human cultures to develop. These three parts of the brain do not operate independently of one another. They have established numerous interconnections through which they influence one another. The neural pathways from the limbic system to the cortex, for example, are especially well developed. For more about how these structures of the mammalian brain evolved together, click this link.

 

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Dr. Amber Quaranta-Leech, LPC-S

Amber holds a PhD in Counselor Education and Supervision from Regent University. She is a Licensed Professional Counselor in both Texas and Oklahoma and holds Supervisor credential for Texas. Amber is an EMDRIA consultant and trainer. She has over a decade of experience in the trauma field in work with uniformed services, domestic violence, childhood trauma and abuse, and recent mass trauma events. Amber provides consultation for EMDRIA certification, for consultants-in-training, and supervision for LPC-Associates. Amber continues to research the benefits of EMDR therapy with a variety of populations. Her goal is to help build strong clinicians who are well versed in trauma interventions to better support their clients. Amber sees a limited number of clients with a focus on trauma work, she is also a Certified Career Counselor and Certified through EAGALA to provide equine-assisted therapy. 

Dr. Jose Carbajal, LCSW

Dr. Jose Carbajal, a U.S. Army veteran, earned his bachelor’s and master’s degrees in social work and a master’s in theological studies from Baylor University, and a Ph.D. in Social Work from the University of Texas at Arlington. With over 15 years of clinical experience and extensive teaching experience, Jose specializes in trauma, sexual abuse recovery, domestic violence, and substance abuse. His research focuses on trauma interventions, neuroscience, and faith. He is EMDR Certified, an Approved Consultant, and an EMDRIA Approved Trainer, with numerous publications and professional presentations to his name.

Dr. Amanda Martin, LMFT-S, LPC, BCN

Amanda Martin holds a PhD in Family Therapy and is a Licensed Professional Counselor, Licensed Marriage and Family Therapist Supervisor, and EMDRIA Approved Consultant. With over 14 years of experience, she specializes in trauma therapy for individuals and families in residential and outpatient settings. Amanda also provides supervision for EMDR certification, EMDR consultants-in-training, and LMFT-Associates. Her mission is to help people find a healthy, joyful, and fulfilling path in life. Her warm, supportive, and interactive counseling style incorporates Symbolic Experiential Therapy, Trauma-Focused Cognitive Behavioral Therapy, EMDR, HeartMath, Animal-Assisted Therapy, Neurofeedback, and Collaborative Problem Solving.

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