FearFreezing Reaction, CatalepticExtinction, PsychologicalConditioning, ClassicalConditioning (Psychology)AmygdalaElectroshockGalvanic Skin ResponseMice, Inbred C57BLStartle ReactionAvoidance LearningTime FactorsBehavior, AnimalCytokinesMice, Inbred BALB CMemorySignal TransductionAcoustic StimulationAnxietyMuscimolRats, Long-EvansCells, CulturedAssociation LearningStress Disorders, Post-TraumaticPeriaqueductal GrayLearningCuesGABA AgonistsPrefrontal CortexRats, Sprague-DawleyAnalysis of VarianceNeural PathwaysHippocampusNeuronsMotor ActivityRats, WistarBrainSynaptic TransmissionBrain MappingPhobic DisordersMice, Knockout