The amygdala in humans has been
linked to emotional processing
Microstimulation of the amygdala produces
feelings of fear and apprehension.
Isolated lesions of the amygdala, found in a rare
disorder (Urbach-Wiethe disease) that leaves
calcifications specifically in the amygdala
bilaterally, impair patients from learning how to
discern emotions in facial expressions.  The
disease does not affect the ability to discriminate
fine differences in faces, nor the ability to
recognize faces.