BDNF deletion or TrkB impairment in amygdala inhibits both appetitive and aversive learning.
Heldt SA, Zimmermann K, Parker K, Gaval M, Weinshenker D, Ressler KJ. BDNF deletion or TrkB impairment in amygdala inhibits both appetitive and aversive learning. J Neurosci. 2014 Feb 12; 34(7):2444-50.