Figure 5—figure supplement 8. | 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 5—figure supplement 8.

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Federal University of Rio Grande do Norte, Brazil
Figure 5—figure supplement 8.
Download figureOpen in new tabFigure 5—figure supplement 8. Different filter types give rise to similar results.

(A) Original (green) and surrogate (red) n:m phase-locking levels for actual hippocampal LFPs (same dataset as in Figure 5) filtered at theta and slow gamma (1 s epochs). Different rows show results for different types of filters. FIR corresponds to the same finite impulse response filter employed in all other figures. For the infinite impulse response filters (Butterworth and Bessel), the digit on the right denotes the filter order. Wavelet filtering was achieved by convolution with a complex Morlet wavelet with a center frequency of 7 Hz. (B) Original and surrogate distributions of R1:5 values. For each filter type, the original data is significantly higher than surrogate values obtained from pooled Δφnm, but indistinguishable from single run surrogates. *p<0.01, n = 7 animals, Friedman’s test with Nemenyi post-hoc test.

DOI: http://dx.doi.org/10.7554/eLife.20515.021