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Emotion is a very complex subject that has been discussed and researched for over 100 years. There are several definitions of emotion based upon the various theories that have developed over the course of that time period. However, a working definition of emotion that can be used is that emotions are the cognitive aspect of feeling or the value judgment placed on a particular experience.

Emotions have a physiological basis as was studied by Cannon who gave the first descriptions of bodily changes during simpler emotions and found that the thalamus is the center of emotion. The adrenal gland and adrenaline, acting along with the autonomic nervous system, produce the physiological changes within our bodies which we then label as emotions. (deCatanzaro 6) Papez identified the limbic system as being a critical part of many emotions. He argued that “emotions influence consciousness, and hence the cortex, and in turn higher cognitive functions influence emotions.” (deCatanzaro 81) We label these physiological changes as emotions as stated in the James-Lange theory: “physiological changes occur during emotions, and our subjective experience of these emotions involves internal sensation of these changes.” (deCatanzaro 8)

The relationship between emotion and cognition can be explained by theories of emotion developed by Zajonc, Leventhal, and Schacter. According to Zajonc, emotional responses can become socialized and that emotions can occur without cognition. He argued that emotions occur rapidly without any sentiment or thought.

Leventhal proposed a two phase model of emotion in that cognitions promote emotions and expressive reactions and that the overt action is separate from the instinctual. In order to express emotion, we must be able to attach a label to the physiological reactions that occur. Therefore the emotion that is actually presented differs from the instinctual response.

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