Definition of Amygdala Posted By Brandon Rodarte on February 17, 2015 Definition of Amygdala Amygdala The Amygdala is part of the brain that plays an important role in emotion, especially in anger and aggression. References Sternberg, R. Sternberg, K & Mio, J. (2012). Attention. Cognitive Psychology (6t ed.). Mason, Ohio: Cengage.