The hippocampus and its associated areas in the brain, the hippocampal systems, play pivotal roles in navigating the environment and making decisions to achieve goals. The hippocampal systems also make us remember the unique 1 episodic events experienced during goal-directed behavior. Based on the literature and our own experimental results, we think that visual scenes from the environment provide critical information to the hippocampal systems to make contextual choices and direct navigation. We also emphasize that what the animal does with the information (e.g., scene), from the environment determines which neural networks are engaged in a given task. That is, the functional network dynamics in the hippocampal systems are not determined solely by sensory-perceptual information but also by task demand during goal-directed behavior. We use VR experimental setups and electrophysiological techniques for our research to decipher the neural codes in the hippocampal memory systems.