MemoryMemory DisordersMemory, Short-TermImmunologic MemoryMemory, Long-TermMemory, EpisodicMental RecallMaze LearningNeuropsychological TestsRetention (Psychology)Recognition (Psychology)HippocampusLearningAssociation LearningAmnesiaVerbal LearningFearSpatial BehaviorCognitionAvoidance LearningConditioning (Psychology)Reaction TimeCD8-Positive T-LymphocytesMagnetic Resonance ImagingConditioning, ClassicalAnalysis of VarianceCognition DisordersPsychomotor PerformanceBehavior, AnimalBrainAttentionPrefrontal CortexBrain MappingCuesAmygdalaTemporal LobeMice, Inbred C57BLRepression, PsychologyPhotic StimulationTime FactorsAmnesia, RetrogradeNeuronal PlasticityCD4-Positive T-LymphocytesLong-Term PotentiationAgingPattern Recognition, VisualPaired-Associate LearningExploratory BehaviorMushroom BodiesAutobiography as TopicVisual PerceptionT-Lymphocyte SubsetsExecutive FunctionLymphocyte ActivationMice, TransgenicRats, Long-EvansLearning DisordersEmotionsNeuronsAmnesia, AnterogradeScopolamine HydrobromideAlzheimer DiseaseExtinction, PsychologicalElectroshockNeural PathwaysFunctional LateralityAntigens, CD27Nerve NetAssociationSmellDiscrimination LearningTask Performance and AnalysisOdorsParietal LobeFrontal LobeImage Processing, Computer-AssistedSemanticsMice, KnockoutAnisomycinVerbal BehaviorCerebral CortexModels, NeurologicalWechsler ScalesSerial LearningB-LymphocytesEntorhinal CortexElectroencephalographyDiscrimination (Psychology)Antigens, CD45SynapsesImmunophenotypingImaginationRats, Sprague-DawleyNootropic AgentsJudgmentCA1 Region, HippocampalTheta RhythmB-Lymphocyte SubsetsImmunization, SecondaryLymphocytic choriomeningitis virus