We examined neural oscillations in the dentate gyrus of the hippocampus as animals encountered cues that were associated with positive or negative outcomes. We observed a reliable shift in the rhythmic profile of the dentate gyrus such that decreases in theta (5-10 Hz) amplitude occurred concurrently with increases in beta (15-30 Hz) amplitude. These oscillatory dynamics suggest that the hippocampus is entering a different processing state, with each rhythm operating under different neural mechanisms. We propose that the shift mediates the processing of meaningful cues in the dentate gyrus. Read our publication here.