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1.
Figure 4

Figure 4. From: Emergence of Synchronous EEG Spindles From Asynchronous MEG Spindles.

Coherence-frequency relationship in ME versus Mo spindles. The average MVDR coherence between all pairs of gradiometers is plotted from 10 to 15 Hz. Although higher frequencies had higher coherence, this was similar for ME (solid) and Mo (dashed). Thick lines are means, thin standard deviation.

Nima Dehghani, et al. Hum Brain Mapp. 2011 December;32(12):2217-2227.
2.
Figure 5

Figure 5. From: Emergence of Synchronous EEG Spindles From Asynchronous MEG Spindles.

More frontal and midline MEG topography in spindles that are also seen with EEG. Topographic plots of MEG gradiometer spindle power during spindles observed only in MEG (A), in both MEG and EEG (B), and their ratio (C). Note the locations marked by white arrows in C, where the maximum signal increase was observed. These locations are anterior and toward the midline as compared to the maxima in A and B. The arrows are placed in the same locations in all three topoplots.

Nima Dehghani, et al. Hum Brain Mapp. 2011 December;32(12):2217-2227.
3.
Figure 1

Figure 1. From: Emergence of Synchronous EEG Spindles From Asynchronous MEG Spindles.

Example Mo (MEG-only) and ME (MEG+EEG) spindles. For clarity, selected spindles in sample referential EEG and MEG gradiometer channels are highlighted in gray. Broadband (A) and 7–15 Hz bandpass (B) recordings are shown. Complete recording profiles are shown in Supporting Information Figures 1 and 2. L (Left), M (Middle), R (Right) F (Frontal), T (Temporal), C (Central), P (Parietal).

Nima Dehghani, et al. Hum Brain Mapp. 2011 December;32(12):2217-2227.
4.
Figure 3

Figure 3. From: Emergence of Synchronous EEG Spindles From Asynchronous MEG Spindles.

Probability of MEG vs. EEG spindle co-occurrence. Spindles were automatically detected from MEG gradiometers and referential EEG, and their co-occurrence at different delays is plotted. The thick black line shows the probability that an MEG spindle occurs given that an EEG spindle had, and the thin gray line shows the reverse relationship. Error bars are standard deviations across subjects. Dashed lines represent the probability of peak coincidence after the inter-spindle intervals have been randomized. Both solid lines are greater than their corresponding dashed lines, indicating that spindles in the two measurement modalities do tend to occur together. The gray thin line is below the black thick line, indicating that most EEG spindles are accompanied by a MEG spindle, but not vice versa.

Nima Dehghani, et al. Hum Brain Mapp. 2011 December;32(12):2217-2227.
5.
Figure 6

Figure 6. From: Emergence of Synchronous EEG Spindles From Asynchronous MEG Spindles.

Comparative time-course of MEG and EEG power during ME spindles. A. Normalized power across all spindles and channels shows that MEG gradiometer activity (solid line) has increased to 15% of maximum ~ 190 ms before the referential EEG (dashed line), and it falls to that level ~320 ms after the EEG. Similarly, at 40% of maximum, MEG leads the EEG by 100ms during the rising phase, and lags it by 140 ms during the falling phase, of the spindle. B. The same pattern is seen in each of the subjects considered individually. For statistical analysis, the period from 700 to 300ms before the peak power was taken as the rise period, and from 300 to 700 ms after the stimulus to be the fall period (see text).

Nima Dehghani, et al. Hum Brain Mapp. 2011 December;32(12):2217-2227.
6.
Figure 2

Figure 2. From: Emergence of Synchronous EEG Spindles From Asynchronous MEG Spindles.

Automatic detection of EEG and MEG spindles. A. Power from 7 to 15 Hz in a 500 ms moving window (Sequential power spectral density: SPSD) is plotted for a 30-s epoch of Stage 2 sleep for each EEG ch, normalized to the maximum value of the largest channel. The average of all channels is in red. B. Output of the EEG spindle detection algorithm (see Methods). The horizontal line indicates the detection threshold, and yellow stars denote automatically detected peaks, with maroon vertical lines allowing comparison of their timing to other panels. C. MEG SPSD for each channel, normalized to the maximum value of the largest channel. The average of all channels is in red. D. MEG SPSD for each channel, normalized to the maximum value of that channel. The average of all channels is in red. E. Output of the MEG spindle detection algorithm. The horizontal line indicates the detection threshold, and yellow stars the automatically detected peaks, with green vertical lines allowing comparison of their timing to other panels. Many MEG spindles have little or no corresponding EEG spindle. (For an additional example from another subject, see Supporting Information Fig. 1).

Nima Dehghani, et al. Hum Brain Mapp. 2011 December;32(12):2217-2227.

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