SVM classification performances using theta phases of CA3 spikes either referencing to distal CA1 or proximal CA1. The classification performance using the phases of the CA3 neurons referencing to distal CA1 theta, but not to proximal CA1 theta, was above chance level and comparable to memory performance. This indicated that interregional coupling (spike to theta oscillations) between CA3 and CA1 can predict memory performance trial by trial and plays an important role in recognition memory, especially between CA3 and distal CA1 for odor memory. The number of CA3 theta phase discriminating neurons per animal is in brackets. CA3 neurons were recorded along the entire proximodistal axis of CA3. Dots, individual SVM performance; red arrows: mean angle of the population cell firing. Error bars: SEM.*p< 0.01.
