Figure 6.

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).