Relation between broadband power and phase of ECoG rhythms (subject 4).

<p>(<b>A</b>) ECoG potential (in D) was measured from a pre-central motor cortex site (green dot). (<b>B</b>) Periodic flexion of index finger (green) and other fingers (gray). The entire movement and rest periods are all examined. (<b>C</b>) Fluctuations in broadband power (projection of the 1^st PSC, here shown smoothed), extracted from ECoG potential. (<b>D</b>) The raw ECoG potential. (<b>E</b>) Example low frequency rhythm obtained by convolving ECoG with a 3 Hz wavelet (inset). The resulting time-series is color coded for instantaneous phase (relative to positivity peak of the potential). (<b>F</b>) Log values of the time-dependent broadband have a normal distribution. (<b>G</b>) The timeseries of the log of the broadband, color coded by the coincident phase of the low frequency 3 Hz rhythm. (<b>H</b>) The log-broadband signal is aligned with the phase of the low frequency rhythm (as color-coded). (<b>I</b>) The average of the log-broadband amplitude is obtained for phase bins. Error bars denote 3 times the standard error of the mean (3*SEM) for each phase bin. This can be appreciated in one dimension as the “3 Hz coupling row” in G. (<b>J</b>) The “Phase coupling palette” obtained by repeating the process detailed in E–I at each frequency from 1–50 Hz., showing modulation of broadband power with the full range of frequencies.