Fig. 8.

Fluctuation of amplitude observed for two uncoupled sources. The sources were animated with steady dynamics at 10 Hz (S1, blue), and 12 Hz (S2, red), respectively (A). Other parameters of the model were identical to those reported in Fig. 6A. (B) Shows that apparent signals at the scalp exhibit a regular waxing/waning envelope. (C) Discloses the genuinely drifting relative phase of the sources (yellow) and the spuriously lingering relative phase observed at the scalp (green). Note that this phase lingering can be distinguished from the dwells characteristic of the metastable regime: the former is centered at 0 rad, the latter has attracting tendencies near but not at 0 rad.