The amygdala plays a crucial role in emotional processing, particularly in mediating fear. Increased activity in this structure is associated with fear learning. Furthermore, this heightened activity is also observed in individuals who are at risk for or are currently suffering from mood disorders.

Role of the Amygdala in Fear and Mood Disorders

- Fear is one of Paul Ekman's 6 basic emotions that he believes are universal and genetically predisposed.
- Charles Darwin's theory of serviceable habits suggests that there is something adaptive in the form of the expression itself. Hence for example, the facial expression for fear is adaptive because you have to take as much information as possible to assess the environment and situation. 

New York University

The body and mind has multiple ways of responding to emotions. 

Emotions, aggression and stress in the brain

Ward, J. (2016). The Student's Guide to Social Neuroscience (2nd ed.) Taylor and Francis.

- Theories of emotion
- Evolutionary viewpoint of emotions
- How many emotions are there
- Brain circuits for different emotions
- Neural circuitry of violence and aggression
- Stress and body responses
- Emotions and the immune system

Subjects in emotions, aggression and stress in the brain

Fear

Chronic pain is pain that is experienced for many days during a week for three months or more, and can either be a primary or secondary symptom. 

Chronic Pain

Cognitive reappraisal is an emotional regulation strategy that encourages the reinterpretation of an emotional stimulus in order to change the meaning of the stimulus.

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