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as has done one member of our Facebook group:
Paul MacLean described this model.
The theory is wrong. Our brains are not fundamentally different from those of reptiles or even fish. Every mammal has a neocortex, and all vertebrae, including reptiles, birds, amphibians and fish, have cortex analogies. For example, the neocortex of mammals is not a completely new structure, but a modification of the reptile cortex.
This is her comment.
Paul Donald MacLean was an American physician and neuroscientist who made significant contributions in the fields of physiology, psychiatry, and brain research through his work at Yale Medical School and the National Institute of Mental Health.
This is according to Google.
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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.
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