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. Author manuscript; available in PMC: 2011 Jan 12.
Published in final edited form as: Prog Neurobiol. 2008 Sep 30;87(1):31–40. doi: 10.1016/j.pneurobio.2008.09.014

Fig. 4.

Fig. 4

Example of short-lived phase dwelling between 10 Hz oscillations at three recording sites located above left parieto-occipital, right parietal and left prefrontal areas suggesting that three cortical sources are engaged in a common task. Phases aggregate near electrodes bearing maximal amplitude at PO3 (1st blue arrow), P6 (1st magenta arrow) and AF3 (1st green arrow). Dwelling is established during the period marked by a white frame and lasts about 2 cycles (ca. 170 ms). The common frequency of coupled areas varies around 8.5 Hz. During the episode, PO3 leads P6 by 26° and AF3 by 87°. After dissolution of the synchronized assembly, reorganization is observed: left prefrontal area slows down whereas right parietal and left parieto-occipital areas increase their frequencies (second series of colored arrows). Oscillations at AF3 and PO3 eventually recede in strength, while oscillation at P6 grows and organizes activity with left centro-parietal site to form a new pattern with apparent locking antiphase.