The Amygdala 's Impact On Fear

Fear is a powerful human emotion. It can make you do things you wouldn’t normally do, like risk taking and bad choices. Fear can spike your adrenaline. For example if someone was to lift a car off a run over child, that would be caused by adrenaline, which is caused by fear. According to several studies done by physicians

The response to fear begins in a part of the brain called the amygdala, which functions as the threat center. It triggers the fight or flight response. In his novel, Golding uses Ralph to display both of these reactions. For example, Ralph begins to fear Jack after they split into separate tribes. The turmoil within the group leads to a fight amongst the two boys, “They met with a jolt and bounced apart. Jack swung with his fist and caught him on the ear. Ralph hit Jack in the stomach and made him grunt.” (207). Rather than let his fear get the best of him, Ralph fights back against Jack to protect himself. In this situation, his brain aids him in quickly and impulsively reacting to what is happening. However, when facing the beast for the first time, Ralph chooses to flee instead, “Ralph found himself taking giant strides among the ashes… Presently the mountain was deserted, save for three

Written by Oxford English Dictionary, fear is an unpleasant emotion caused by the threat of danger, pain, or harm, and is an emotion that is programmed into all animals and people as an instinctual response to potential danger. Fear isn’t always adaptive though. For example, a small amount of fear before an important speech serves a purpose. It encourages you to focus on your topic and avoid embarrassing yourself. This is a type

“The ‘stress hormone’ cortisol is believed to create a domino effect that hard-wires pathways between the hippocampus and amygdala in a way that might create a vicious cycle by creating a brain that becomes predisposed to be in a constant state of fight-or-flight” (Bergland, 2014).

From the study conducted by Ferri et al., there was a slight statistical significance between amygdala activation to neutral and fearful faces in regards to anxiety levels. On the contrary, they did not find a significant difference. This could be due to the girls being unable to predict the

Fear is a chemical chain reaction in the brain. It is in the part of the brain that allows us to communicate and to speak with other people ("Layton, Julia"). The idea is an autonomic response in the brain with many parts of the brain involved. Fear starts with a scary stimulus and ends with a fight or flight response telling the human to fight back or run away. It starts with two processes the quick and messy way, and the clear and slow way ("Layton, Julia"). The quick way is when you are panicking and out of breath and the clear way takes a while and is when you calm down and realize it was nothing. Both of the processes happen simultaneously ("Layton, Julia"). The brain uses your blood stream and nervous system to create fear. When your muscles tighten and your heart races, you are probably in a state of fear. Without fear you would walk into traffic or pick up poisonous snakes. Fear saves our lives ("Layton,

The amygdala of psychopaths have has been found to be hypoactive during fear conditioning (Birbaumer et al., 2005), moral decision-making (Glenn, Raine, & Schug, 2009), and social cooperation (Rilling et al., 2007). As expected, studies have also found the amygdala to be hypoactive in response to fearful faces or other affect-related activity (e.g. Carré et al., 2013; Kiehl et al., 2001). Nevertheless, Müller et al. (2003) found that psychopaths had increased activation in the amygdala (in addition to increased prefrontal activation) when viewing negative content (e.g. pictures of threatening animals, wounded people) which they interpreted as reflecting abnormal prefrontal – amygdala communication.” (Umbach et al., 2015,

Studying parts of the brain that are involved in dealing with fear and stress also helps researchers understand possible causes of PTSD to begin formulating a plan to treat PTSD. The amygdala is known for its role in emotion, learning, and memory. The amygdala appears active in learning to fear an event as well as in the early stages of fear extinction. In storing extinction memories and dampening an existing fear the prefrontal cortex, which is involved in problem solving, decision making, and judgement, is seemingly

According to PhycologyToday.com fear is an emotional response induced by a perceived threat, which causes a change in brain and organ function, as well as in behavior. Fear can lead us to become narcissistic, to run away from various issues, or to freeze up and become victim under circumstance, or it may come in the form of a discovery.

Due to its primary role in processing memory and emotional reactions, over the last decade and a half psychologists have been linking the amygdala to psychopathy. It is involved in aversive conditioning and instrumental learning and is thus involved in all the processes that, when impaired, produce the same functional impairments displayed by psychopaths. Two famous studies conducted by Tiihonen and Kiehl respectively have confirmed this. Tiihonen used a volumetric MRI to test and confirm the positive correlation between low amygdaloid volume and a high degree of psychopathy in violent criminals (measured by the Hare checklist-revised) while Kiehl used a functional MRI to prove reduced amygdala response during an emotional memory task in individuals who scored high on the Hare checklist-revised. However, both these studies along with numerous others were conducted using violent offenders as subjects rather than individuals with psychopathy. Although many psychopaths do exhibit violent tendencies, not all violent offenders are necessarily psychopaths. A study conducted by Raine is one of the few that did focus only on individuals exhibiting psychopathy. In his study Raine was able to show reduced prefrontal grey matter in his test subjects. Unfortunately though, he was unable to differentiate between grey matter in different regions of the prefrontal cortex. It is however clear that there is one region of the frontal cortex that could be

The limbic system was first recognized due to Franz Josef Gall (LeDoux, J., 1996). Franz Joseph Gall developed the idea of “phrenology” that focused on the study of the different variations of bumps on the human skull to be related to differences in behavioral and emotional functioning. The limbic system’s main function in the brain is to control emotional behaviors and certain forms of memories that are infused with emotion (amygdala). The amygdala is a part of the brain that forms the tail end of the basal ganglia within the rostral temporal lobe and is located near the hippocampus (Lambert, K.G. & Kinsley, C .H., 2005). The amygdala, as defined by the text, is an almond-shaped structure that functions as a part of the limbic system involved in regulation of emotion and sexual urges (Lambert, K.G. & Kinsley, C .H., 2005). In addition, the amygdala is comprised of a dozen or more sub regions that are not all involved in fear conditioning (LeDoux, J., 1996).

To continue the research, Jordan Smoller distinguishes this section of the genetics of anxiety, “…the majority of the genetic association studies of the anxiety disorders have been candidate gene studies based on a limited number of biological hypotheses. [These are] commonly focused on genes related to monoaminergic neurotransmitter systems [(refer to the particular neurotransmitters dopamine, noradrenaline, and serotonin)], neuropeptides, and HPA axis function [(hypothalaic-pituitary-adrenal axis)]” (Smoller, p. 308). Individually, settled test creature models catch critical parts of human nervousness and dread conduct, and neuroimaging considers have gained free ground in mapping the primary and practical segments of uneasiness/fear symptoms.

The importance of the amygdala in social cognitions has been examined in both primate and human studies. Use of primates to study the social brain suggests that the amygdala contributes to social cognition. Kluver and Bucy made large bilateral lesions in monkey brains made across the amygdala, temporal neocortex, and surrounding structure. After the lesion, the animals engaged in hypersexual behaviors, unusual tameness, and a lack of knowledge about emotional stimuli. Lesions exclusively targeting the monkey’s amygdala resulted in similar, but more subtle impairments. This suggest that the amygdala may play a role in emotions elicited by social cues. Studies of the amygdala’s role in human social cognition suggest that the temporal lobes process socially relevant facial information from humans. Emotions from facial expressions, in particular fear are projected to the amygdala. Studies using FMRI to examine typical subjects and subjects with amygdala damage support this theory. Individuals with amygdala damage have difficulty recognizing facial expressions, specifically negative emotions such as fear.

Emotional regulation is a crucial element when facing stressors in daily life in order to cope with them. It is usually difficult to do this because such stressors lead to an overwhelming amount of uncontrollable emotions for certain individuals. The amygdala is an almond shaped part of the brain that is responsible for how people react and control their emotions, however, other factors may also affect emotional reactivity in correlation with the function on the amygdala. One example is age. The older an individual is, the easier it becomes to control his/her emotions when presented with a stimulus. This is partially why adolescents tend to overdramatize their environments in a negative way. Another factor is a person’s physical health. Those who have better physical health tend to have a better emotional reactivity compared to those who do not. Therefore, possible factors that attribute to emotional regulation in the amygdala are age and physical health.

When talking about emotion it seems a fairly simple topic and immediately "feeling" words come to mind; sad, happy, and confused. These are basic emotions and easy to understand. What isn't so simple about emotions is their process and how they form and work. Emotions are reactions to sensory information like sight, smell, taste, touch and sound (Tracing Emotion’s Pathways 94). However, it is not that simple; an emotional reaction or response is made aware of and understood by a part of the brain called the sensory cortex. These emotional responses or reactions to sensory stimuli are processed by a part of the brain called the amygdala (What’s An Emotion). The amygdala is a huge asset to the cognitive factors of emotions because in processing emotions you become able to understand, recognize, and control them. So then how do emotions evoke a physiological reaction such as tearing up when one feels sad, laughing with joy, and trembling with fear? These physiological reactions that one may experience come from the autonomic nervous system. The autonomic nervous system is, “a collection of fibers that extend throughout