Our goal is to understand the neural mechanisms that support decision making, interval timing and event memory. We investigate how neural processes underlying these functions are implemented in the rodent brain by examining discharge characteristics of neuronal ensembles in behaving animals, by examining effects of manipulating specific neural systems on animal's behavior and neural activity, and by computational modeling. We take these approaches under the premise that understanding neural circuit dynamics is a key to understanding the neural basis of brain functions as well as malfunctions.