Microinfusion of Pituitary Adenylate Cyclase-Activating Polypeptide into the Central Nucleus of Amygdala of the Rat Produces a Shift from an Active to Passive Mode of Coping in the Shock-Probe Fear/Defensive Burying Test - Gabor Legradi; Mahasweta Das; Brian Giunta; Khemraj Hirani; E. Alice Mitchell; David M. Diamond (Neural Plasticity)