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Examples of hippocampal events that were not considered as sleep spindles. (A) The morphology in the filtered signal might suggest abortive, irregular spindle-like morphology. This morphology, however, varies significantly in both frequency and amplitude. Unfiltered signal confirmed epileptic spike activity. (B) One event has morphology compatible with a sleep spindle in both unfiltered and filtered signal (see arrow). It was not considered a sleep spindle due to a duration < 0.5 sec.
