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emotional soup |
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“My father is so old and I know he may die soon and thinking about that makes me sad.”
“I am always afraid I’m going to
fail when I take a test. I get really angry and upset “If I start to think about where I am in my career, I start to worry and can’t easily stop and then I become anxious about the future and the unknown.” All of these emotions are initiated by outside events or tied to the outside world and are linear in nature - action A causes B inside of us. But what of the emotions that come from seemingly nowhere? What of depression or sadness when waking up in the morning that stays with us all day or all week? Why are we sometimes irritable for no reason? And what of the emotions that seem to hook-on and can’t be shaken, causing free-floating anxiety, anger management problems, apathy, angst and obsessive worry? Often there is no outside event to tie on to the feelings. And what of temperaments? We all have known family and friends that have personalities that are overly irritable, obsessive, emotional or suspicious. We say its part of who they are. Neurobiology informs us that many emotions, especially primal emotions, arise from structures such as the amygdala, an almond-shaped piece of the mid brain about the size of your nostril. Amygdala is the Latin word for almond and is responsible for the emotional state of fear, anger, and perhaps many more emotional states. Is there not so much trouble in such a little package, responsible for much of our society’s ills including divorce, drug abuse and war? But let us not blame the poor little amygdala, its just doing its job. It merely receives messages from the thalamus (an interpreter of our senses), or cerebrum (our higher thinking and reasoning brain) or the hippocampus (involved in long-term memory consolidation). The amygdala reacts to content and intensity and sends impulses to other structures to activate appropriate hormones and the autonomic nervous system. It also is key in the attachment of emotional content to memories and thus aids in memory retention. Clinical studies of amygdala-damaged subjects have shown a strong decrease or lack of emotions, absence of fear and hyper-sexuality. The amygdala is a principle structure in the responses of fear, anger and the emotional content of memory and has also been linked to depression.1 The
cerebrum, the thinking reasoning CEO, can modulate actions of the
amygdala but by But surely, this is too much to put on the little shoulders of the poor amygdala! The amygdala is highly involved in the primitive emotions of fear and anger and the memory of dangerous situations. These are emotions of survival, but what of pleasure and joy? The amygdala is part of a neural loop of many structures that mediate emotions called the limbic system. In this system are the amygdala, thalamus, and hippocampus and many other identified structures. Also involved is the nucleus accumbus which is center of pleasure and reward. The hypothalamus is involved in the activation of the autonomic nervous system, release of hormones, hunger, thirst, sleep, blood pressure, heart rate and sexual arousal. Also in this system, with other components, is the orbital frontal cortex, which is the decision-maker, the CEO. The amygdala has lots of codependent associates. The limbic system isn’t just a conglomeration of structures in the brain that seem to work together but a definite evolved structure that is present in all mammals, reptiles, birds and amphibians.2 In some of these creatures this is the higher brain, minus the cerebrum (orbital frontal cortex), which is the decision maker. Mammals have cerebrums attached over and around the limbic system and humans have cerebrums with intricate folds increasing the surface area of the brain. But the limbic system is still there deep within the brain pumping out emotions. Problems arise because of repeated or learned stressors that we may face in everyday life, emotion-laden memories or over-concentration on internalized problems that causes the limbic system to continue to activate in a circuit pumping out hormones and altering the bodies response systems. This leads to what we perceive as stress and can also lead to chronic or long-lasting feelings of fear, anxiety, depression and hyperactivity. If
there were ways to map our emotional landscape that would allow us to,
not only to
1. Restak, R. (2001) The Secret Life of the Brain. Washington D.C., Joseph Henry Press 2.
Zautra, A. Emotions, (2003) Stress
and Health. Oxford, Oxford University Press |
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