campus can be depotentiated by low-frequency stimulation. 5-HT4 receptors are expressed in the hippocampus and are suggested to be involved in hippocampus-dependent cognitive processes. Since the role of these receptors in the dentate gyrus has yet not been characterized, this study investigated the effects of 5-HT4 receptors on basal synaptic transmission, LTP and depotentiation in the dentate...