Maze LearningNeuronal PlasticityHippocampusLong-Term PotentiationMemorySynapsesLong-Term Synaptic DepressionSpatial BehaviorSynaptic TransmissionWaterExcitatory Postsynaptic PotentialsReceptors, N-Methyl-D-AspartateLearningCA1 Region, HippocampalFearBehavior, AnimalDentate GyrusElectric StimulationBrain-Derived Neurotrophic FactorReceptors, AMPANeuronsRats, Sprague-DawleyConditioning, ClassicalMice, Inbred C57BL2-Amino-5-phosphonovalerateMice, KnockoutMemory DisordersExcitatory Amino Acid AntagonistsAvoidance LearningPatch-Clamp TechniquesAnalysis of VarianceMice, TransgenicReceptors, Metabotropic GlutamateElectrophysiologyRats, WistarAmyloid beta-PeptidesWater SupplyDendritic SpinesExploratory BehaviorSwimmingSpace PerceptionRats, Long-EvansConditioning (Psychology)Learning DisordersReversal LearningDiscrimination LearningBrain