Figure 4—figure supplement 2. | On cross-frequency phase-phase coupling between theta and gamma oscillations in the hippocampus

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On cross-frequency phase-phase coupling between theta and gamma oscillations in the hippocampus

Figure 4—figure supplement 2.

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Federal University of Rio Grande do Norte, Brazil
Figure 4—figure supplement 2.
Download figureOpen in new tabFigure 4—figure supplement 2. The statistical significance of artifactual n:m phase-locking levels induced by waveform asymmetry depends on epoch length and peak frequency variability.

Shown are the median R1:5 computed between theta and slow gamma for sawtooth waves simulated as in Figure 4C, but of different epoch lengths and peak frequency variability. Dashed area corresponds to the interquartile range (n = 300). Surrogate data were obtained either by Radom Permutation (top row) or Time Shift (bottom row) procedures. Notice that the longer the epoch or the peak frequency variability, the larger the difference between original and surrogate data, and that this difference is greater for randomly permutated than time-shifted surrogates.

DOI: http://dx.doi.org/10.7554/eLife.20515.012