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Examples of scalp and hippocampal sleep activity. Shown are 10 s segments of artifact-free data from a single patient (p4). Note the different amplitudes of scalp and hippocampal traces. Spectrograms show percent amplitude change relative to mean across all artifact-free N2, N3 and REM sleep. Arrows illustrate phenomena described in the main text (solid: stronger effect; dashed: weaker effect). Hippocampal channel located in posterior hippocampus (TL08 in Fig. 4AC).
