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Phase synchronization index. (A) Phase locking value (PLV) of LFPs between CA3 and CA1 at theta and gamma frequency bands in Con and 2VO groups (n = 6). (B) Phase–phase (n:m) coupling between theta and gamma oscillations. Mean radial distance values (r values) from the distribution of the difference between m × theta and n × gamma phases calculated for different ratios in these two groups. *p < 0.05 and **p < 0.01 comparison between Con group and 2VO group.
