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. Author manuscript; available in PMC: 2009 Sep 22.
Published in final edited form as: Neuron. 2009 Jun 11;62(5):612–632. doi: 10.1016/j.neuron.2009.05.015

Figure 1.

Figure 1

EEG recordings of sleep spindles (A) and spike-wave discharges (B) from the same patient. A1. A 10 Hz low-amplitude spindle oscillation lasting two seconds was recorded on all 4 channels during stage 2 sleep (demarked by the horizontal bar). B1. EEG activity during an absence seizure as evidenced by the hallmark 3 Hz spike-wave discharge on all 4 channels. Traces correspond to same 4 channels recorded in A. A2 & B2. The section of recordings demarcated by the line below the bottom trace of A1/B1 is expanded in A2/B2. Note the change in vertical gain. EEGs are biopolar recordings and were placed according to the Standard International 10-20 System of Electrode Placement with a transverse montage crossing midline. EEG recordings courtesy of Dr. Kevin Graber, Stanford University Epilepsy Center.