N. Kalin et al., “The Role of the Central Nucleus of the Amygdala in Mediating Fear and Anxiety in the Primate,” J Nsci 24 (2004): 5506; T. Hare et al., “Contributions of Amygdala and Striatal Activity in Emotion Regulation,” BP 57 (2005): 624; D. Zald, “The Human Amygdala and the Emotional Evaluation of Sensory Stimuli,” Brain Res Rev 41 (2003): 88.