Fig. 4

OB phase increased coupling with the EC phase during correct working memory performance. a Representative sample filtered LFP that gamma-2 (50–80 Hz) superimposed on low frequencies (0–12) within correct (left) and wrong trials (right). b Sample of phase–phase 2D histogram of OB low frequencies (0–12) and EC gamma-2 during correct and wrong trials. c, d OB–EC circuit oscillations showed an increased phase–phase coupling at delta–gamma-2 and theta–gamma-2 during correct trials vs. wrong. Data were averaged for either correct (blue dots) and wrong (red dots), data were analyzed by paired t test, n = 6 per group. * p < 0.05; ns, not significant. OB, olfactory bulb; EC, entorhinal cortex