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Phase coupling between different frequency components. Cross-bicoherence was computed between the signals in area 17 (x axis) and area 7 (y axis) during the go stimuli. Shown is the smoothed logarithm of the bicoherence values. The peak in the lower right corner indicates a phase coupling between γ (60–100 Hz) activity in area 17 and 0–30 Hz activity in area 7. This peak (bicoherence at 80 × 8 Hz, 0.6) was significant with P < 0.001.
