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The coupling direction index 
and c. a
varied with frequency from 1 to 40 Hz (n = 6) from LDDM to mPFC. *p < 0.05 and **p < 0.01 between Con and Str groups and #p < 0.05 and ##p < 0.01 between Str and MEM groups. The unidirectional phase–phase coupling indices between LDDM and mPFC: b
(forward) and c
(backward) at five rhyrhms. **p < 0.01 between Con and Str groups
