Study shows how the brain coordinates neuronal processing and communication during sleep NatureNeuro
. In brief, for SO detection, the signal was first band-pass filtered between 0.3 and 1.25 Hz. Second, all zero crossings were determined in the filtered signal, and event duration was determined for SO candidates as the time between two successive positive-to-negative zero crossings . Events that lasted between 0.8 and 2 s entered the next step. Third, event amplitudes were determined for the remaining SO candidates . Events in which both amplitudes exceeded the mean plus 1 s.d.
For spindle detection, the signal was band-pass filtered at 12–16 Hz, and the root mean square signal was calculated based on a 200-ms window followed by an additional smoothing with the same window length. A spindle event was identified whenever the smoothed RMS signal exceeded a threshold, defined by the mean plus 1 s.d. of the RMS signal across all NREM data points, for at least 0.4 s but not longer than 3 s.
Detection of ripples followed the same procedure, except that the iEEG signal was band-pass filtered from 80 to 120 Hz and both RMS calculation and smoothing were based on 20-ms windows. Detection and upper cutoff thresholds were defined by the mean of the RMS signal plus three and nine times the s.d., respectively. Potential ripple events with a duration of 200 ms were rejected. Additionally, all ripple events were required to exhibit a minimum of three cycles in the raw EEG signal.
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