What does the amygdala do?

Or rather, the amygdalae — there are two of them. They’re part of the limbic system (about which more later), and each consists of several nuclei. The nuclei are roughly almond-shaped; the Greek word for almond is “amygdale” (αμυγδαλη); you see the connection. Together they are involved in many brain functions, including:

• Fear conditioning
• Appetitive conditioning
• Processing and memory of emotions
• Memory consolidation
• Neurotransmitter activation
• Sympathetic nervous system activation
• Facial muscle movement

Irregularities in the amygdalae have been linked to borderline personality and bipolar disorders, schizophrenia, and autism. Damage to them can cause a general wacky fearlessness. So keep yours safe.