MemoryMemory DisordersMemory, Short-TermImmunologic MemoryMemory, Long-TermMemory, EpisodicMental RecallTime FactorsNeuropsychological TestsMaze LearningRetention (Psychology)Recognition (Psychology)HippocampusLearningAnalysis of VarianceAssociation LearningTreatment OutcomeVerbal LearningAmnesiaCognitionFearReaction TimeMagnetic Resonance ImagingSpatial BehaviorBrainAvoidance LearningCognition DisordersConditioning (Psychology)Mice, Inbred C57BLPsychomotor PerformanceFollow-Up StudiesBehavior, AnimalCD8-Positive T-LymphocytesNeuronal PlasticityConditioning, ClassicalAttentionBrain MappingAgingPrefrontal CortexTerm BirthCuesPhotic StimulationProspective StudiesAmygdalaTemporal LobeRepression, Psychology