The Amygdala is an almond-shaped section of nervous tissue located in the temporal lobe of the brain. It is thought to be a part of the limbic System within the brain. This system is responsible for emotion, survival instincts and memory. However, studies have shown that the amygdalae can function independently of the limbic System.
The primary purpose of the amygdala is to detect fear and prepare us for emergencies. Moreover, it’s responsible for the perception of other kinds of difficult emotions such as anger, sadness and aggression.
Whenever an emotional event is experienced the amygdala stores those emotional memories away so that these events can be easily recognized in the future. As such, the amygdala can instantly bring back these memories when a similar event arises, thereby instantly awakening the associated emotional response in an attempt to keep you alert and aware of impending dangers.