Amygdala:

a collection of nuclei found in the temporal lobe. The amygdalae are considered part of the limbic system. They are often linked to fear, but they seem to play a role in orchestrating emotional responses to both positive and negative stimuli—while at the same time helping to form memories about the importance of said stimuli.

Learn more: Know your brain - Amygdala

Watch this 2-Minute Neuroscience video to learn more about the amygdala.

Further reading: The amygdala - Beyond fear