MemoryAlzheimer DiseaseMemory DisordersMemory, Short-TermImmunologic MemoryMemory, Long-TermMemory, EpisodicAmyloid beta-PeptidesNeuropsychological TestsBrainAmyloid beta-Protein PrecursorMental Recalltau ProteinsNeurofibrillary TanglesHippocampusPlaque, AmyloidCognition DisordersMaze LearningApolipoprotein E4CognitionRecognition (Psychology)DementiaRetention (Psychology)Magnetic Resonance ImagingAmnesiaNeurofibrilsPresenilin-1LearningAmyloid Precursor Protein SecretasesAtrophyAgingAmyloidVerbal LearningMice, TransgenicMild Cognitive ImpairmentAssociation LearningDementia, VascularNeuronsTemporal LobeFearPeptide FragmentsAvoidance LearningAnalysis of VarianceCerebral CortexSpatial BehaviorApolipoproteins EReaction TimeBrain MappingConditioning (Psychology)Mental Status ScheduleMice, Inbred C57BLTime FactorsBehavior, AnimalPsychomotor PerformanceCD8-Positive T-LymphocytesCholinesterase InhibitorsPresenilin-2Disease Models, AnimalPrefrontal CortexConditioning, ClassicalAttentionNootropic AgentsAmygdalaLewy Body DiseaseAspartic Acid EndopeptidasesMemantineBrain ChemistryAge of OnsetFrontal LobeCuesLongitudinal StudiesNeuronal PlasticityRepression, PsychologyImage Processing, Computer-AssistedLong-Term PotentiationAniline CompoundsPhotic StimulationAmnesia, RetrogradePresenilinsEntorhinal CortexExecutive FunctionCD4-Positive T-LymphocytesNerve DegenerationSubstantia InnominataLearning DisordersNerve Tissue ProteinsParietal LobeIndansPattern Recognition, VisualCerebral Amyloid AngiopathyCase-Control StudiesVisual PerceptionPaired-Associate LearningNational Institute on Aging (U.S.)Protease NexinsDisease ProgressionExploratory BehaviorAutopsyNeurodegenerative DiseasesDown Syndrome