Permanence of the Synapse and Molecular Instability -- Cellular Biology of AMPA Receptor Trafficking and Synaptic Plasticity -- Imaging of Experience-Dependent Structural Plasticity in the Mouse Neocortex in vivo -- Synapse Loss, Synaptic Plasticity and the Postsynaptic Density -- Impact of Beta Amyloid on Excitatory Synaptic Transmission and Plasticity -- Quantitative Neuropathology in Alzheimer's Mouse Models -- Multiple Levels of Synaptic Regulation by NMDA-type Glutamate Receptor in Normal and Disease States -- Soluble Oligomers of the Amyloid ?-Protein: Impair Synaptic Plasticity and Behavior -- Why Alzheimer's is a Disease of Memory: Synaptic Targeting by Pathogenic A? Oligomers (ADDLs) -- Synaptic Transmission Dynamically Modulates Interstitial Fluid Amyloid-? Levels -- A?-Induced Toxicity Mediated by Caspase Cleavage of the Amyloid Precursor Protein (APP) -- Long-Term Potentiation and A?: Targeting A? Species, Cellular Mechanisms and Putative Receptors -- Genes, Synapses and Autism Spectrum Disorders. (will follow)