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. Author manuscript; available in PMC: 2008 Oct 15.
Published in final edited form as: J Neurosci Methods. 2007 Jul 6;166(1):41–52. doi: 10.1016/j.jneumeth.2007.06.026

Figure 7.

Figure 7

Experimental coherence (in one subject) at several frequencies is plotted versus electrode (or MEG coil) separation in each column for each of three brain states (eyes closed resting, eyes closed computation, eyes open resting) and for the three measures of coherence in each row. The grey curve is the simulated coherence for this subject based on his (MRI estimated, white noise) dipole source orientations in the 3-ellipsoid head model. This figure is similar to Fig. 5 except that the multiple curves represent the average coherence at each sensor separation for the frequencies 9.5, 9, 10, 8.5, 10.5, 5.5, 8, 11, 4, 4.5, 6, 5, 7.5, 11.5, 6.5, 7, 12 Hz. This frequency order (top to bottom) applies to the EEG resting plot. While there are minor differences in the ordering of frequencies, all plots with large coherences over moderate and large distances are for frequencies near the alpha peak at 9.5 Hz. Comparison of these plots with Figs. 4, 5, and 6 indicates that neocortex produces source activity P(r,t) that is moderately to strongly correlated in the theta and (especially) alpha bands in the two eyes closed states.