Evidence has been accumulating that the lateral nucleus of the amygdala is critically involved in the acquisition, storage, and expression of conditioned fear.
Due to the structure's almond-like form, the name "amygdala" is derived from the Greek word "amygdale," which means "almond." The amygdala is situated immediately prior to (in front of) the hippocampus in the medial temporal lobe. The amygdala is a paired structure like the hippocampus, with one in each hemisphere of the brain.
The limbic system, a neuronal network that mediates many facets of emotion and memory, includes the amygdala. Although the amygdala was once thought to be predominantly responsible for fear and other negative emotions brought on by aversive (unpleasant) stimuli, it is now understood that appetitive (rewarding) stimuli can also cause happy emotions.
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