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Home » 2011 » Octombrie » 7 » The Limbic System
04:16 The Limbic System | |
 The structures and nuclei of the limbic system are exceedingly ancient, some of which began to evolve over 450 million years ago. Over the course of evolution, these emotional structures have expanded in size, some becoming increasingly cortical in response to increased environmental opportunities and demands. In fact, as the neocortical forebrain expanded and until as recently as 50 million years ago, the cerebrum of the ancestral line that would eventually give rise to humans, was dominated by the limbic system. However, over the course of evolution a mantle of neocortex began to develop and enshroud the limbic system; evolving at first to serve limbic needs in a way that would maximize the survival of the organism, and to more efficiently, effectively, and safely satisfy limbic needs and impulses. In consequence, the frontal, temporal, parietal, and occipital lobes evolved covered with a neocortical mantle, that in humans would come to be associated with the conscious, rational mind. Sometimes, however, even in the most rational of humans, emotions can hijack the logical mind, and the neocortex, and even peaceful people might be impelled to murder even those they love. Indeed, the old limbic brain has not been replaced and is not only predominant in regard to all aspects of motivational and emotional functioning, but is capable of completely overwhelming "the rational mind" due in part to the massive axonal projections of limbic system to the neocortex. Although over the course of evolution a new brain (neocortex) has developed, Homo sapiens sapiens ("the wise may who knows he is wise") remains a creature of emotion. Humans have not completely emerged from the phylogenetic swamps of their original psychic existence. Hence, due to these limbic roots, humans not uncommonly behave "irrationally" or in the "heat of passion," and get into fights, have sex with or scream and yell at strangers thus act at the behest of their immediate desires; sometimes falling "madly in love" and at other times, acting in a blind rage such that even those who are 'loved" may be slaughtered and murdered. Indeed, emotion is a potentially powerful overwhelming force that warrants and yet resists control-- as something irrational that can happen to a someone ("you make me so angry") and which can temporarily hijack, overwhelm, and snuff out the "rational mind." The schism between the rational and the emotional is real, and is due to the raw energy of emotion having it's source in the nuclei of the ancient limbic lobe -- a series of structures which first make their phylogenetic appearance over a hundred million years before humans walked upon this earth and which continue to control and direct human behavior. Hypothalamus, Septal Nuclei, Amygdala, Hippocampus Emotion and the Unconscious Mind From: Neuropsychiatry, Neuropsychology, Clinical Neuroscience by Rhawn Joseph | |
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