The Three Faces of Norepinephrine: Plasticity at the Perforant Path-Dentate Gyrus Synapse -- The Histaminergic System in Brain: Memory and Synaptic Plasticity -- Spike Timing Dependent Plasticity of Rat Hippocampal and Cortical Synapses and Control by Muscarinic Transmission -- Hydrogen Peroxide Regulates Metaplasticity in the Hippocampus -- Neuronal Plasticity and Seizure Spread in the Entorhiā¦