Figure 1 | Scientific Reports

Figure 1

From: Detecting dynamic spatial correlation patterns with generalized wavelet coherence and non-stationary surrogate data

Figure 1The alternative text for this image may have been generated using AI.

Exemple of the time-frequency (TF) structure for different surrogate algorithms applied to epileptic EEG data. (a) The original time series after reconstruction by the wavelet filtering, (b) surrogate data generated with the iterative Amplitude Adjusted Fourier Transform (iAAFT) algorithm, (c) non-stationary surrogate data test with a DWT (the iAAWT algorithm) and, (d) surrogate generated with our algorithm. The color maps code for \(|({W}_{x}(t,f))|\) values. Wavelet analysis of EEG were done over the frequency range 0–128 Hz (with a frequency resolution of 0.1 Hz). For better visualisation, spectra are displayed only for \(f < 30\,{\rm{Hz}}\).

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