The ability to change behavior in response to environmental changes is essential for survival and is assumed to involve multiple brain regions. However, how individual brain regions cooperate to change behavior in response to environmental changes is still being determined. This research will develop a task in which rats must navigate to obtain rewards in response to environmental changes. Then, we will simultaneously record neural activity from multiple brain regions in rats during the task and sleep before and after the task. By mathematically analyzing the data, we will elucidate how individual neurons and neuronal populations cooperate across brain regions to achieve environmentally adaptive behavioral change.