Figure 3.

Example of scalp EEG and iSTW. A, Local iSTW (Patient 22). Scalp STW are observed in the frontocentral vertex (green box) before a burst of REM (red box). A burst of iSTW (blue box) is observed in the supplementary motor cortex. Note the very focal aspect of the iSTW burst, which is not observed in other intracranial channels. B, Diffuse asynchronous STW (Patient 25). Scalp STW are observed in the frontocentral vertex (green box) before a burst of REM (red box). See the characteristic notch (black arrow). Bursts of iSTW are recorded in three intracranial regions (blue boxes). Note the asynchrony in the onset and offset of iSTW bursts between brain areas.