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A schematic picture of parametrizing inter-spindle synchrony. Seed spindles (light blue) may be overlapped by one or more spindles in other electroencephalography channels (trailing spindles, light gray). Phase lag index (PLI) between the seed and trailing spindles was calculated (striped pattern) if the overlap was equal or higher than 0.3 s. Sign, signum function; ΔΦ, phase difference; tk, samples across the overlapping signal.
