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Electrode placement on the scalp as seen from above: The dominant posterior rhythm was measured in P3, Pz, P4, O1, and O2 (green area), whereas the remaining features were calculated in F3, F4, C3, C4, O1, and O2 (blue dots). Interhemispheric couplings are indicated by solid red lines and intrahemispheric coupling by dotted red lines
