The hippocampus (HPC) and lateral habenula (LHb) work together to guide flexible responding as one’s environment changes. The HPC plays a critical role in learning and remembering events. While the LHb has been shown to encode information about rewards and aversive events, it also enables flexible responding during HPC-dependent tasks. Therefore, we hypothesized that the LHb and HPC communicate during choices, as this should be when the two structures combine reward information and spatial memory to make a decision. It is generally thought that brain structures are communicating when their neural oscillatory activity is coupled. Thus, we measured the activity of large populations of cells in the LHb and HPC while rats performed a spatial memory task. We expected to see higher coherence of oscillatory activity during choices than during other phases of the task, as this would suggest the HPC and LHb are interacting to process reward information and spatial memory in a flexible manner. However, our preliminary results showed that the population activity recorded in the LHb is likely inherited from the HPC by volume conduction, which means that the LHb oscillation is not locally generated. A future direction is to improve our recording method and investigate single-cell characteristics in the LHb with respect to hippocampal oscillations. Overall, this work is important because it guides future steps for studying the communication between the LHb and HPC, which could provide insights on pathological conditions where a person is unable to flexibly respond in a changing context (such as in depression, addiction, or memory disorders). Therefore, future findings from our research may have important clinical applications, with the potential to inform and improve upon existing interventions for disorders of memory and mood.