FearFreezing Reaction, CatalepticExtinction, PsychologicalConditioning, ClassicalConditioning (Psychology)AmygdalaElectroshockGalvanic Skin ResponseAvoidance LearningStartle ReactionBehavior, AnimalMuscimolAcoustic StimulationAnxietyRats, Long-EvansMemoryStress Disorders, Post-TraumaticAssociation LearningPeriaqueductal GrayLearningCuesGABA AgonistsPrefrontal CortexRats, Sprague-DawleyAnalysis of VarianceNeural PathwaysNeuronsHippocampusMotor ActivityRats, WistarTime FactorsMice, Inbred C57BLSynaptic TransmissionBrainBrain MappingMice, Knockout