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. 2014 Jan 8;34(2):662–674. doi: 10.1523/JNEUROSCI.0552-13.2014

Figure 1.

Figure 1.

Basic features of sleep spindles. A, Example of filtered (1–626 Hz) LFP traces of a spindle event recorded simultaneously in the hippocampal CA1 pyramidal layer and visual cortex (vis. ctx). B, Example of filtered (1–625 Hz) LFP traces of a spindle event recorded simultaneously in the hippocampal CA1 pyramidal layer and layer 3 of medial EC. Note the similar onset, offset, and duration of the spindles in different structures. C, Histogram of mean instantaneous peak frequency of spindles recorded and detected in the hippocampal CA1 pyramidal layer (mean of 12.33 Hz, n = 2579 spindles in 15 rats). D, Histogram of spindle duration (mean of 0.49 s). E, Average coherence spectrum between spindles in the CA1 pyramidal layer and layer 5 of the EC (n = 8 sessions in 2 rats; error bars indicate SEM). Note the peak coherence value at 15 Hz. F, Cross-correlogram between LFP spindle minima and detected SWR events in hippocampal CA1 shows temporal association of these two patterns, peaking at 300 ms preceding individual spindle troughs in CA1, with SWR occurrence rate at 187% of baseline (n = 23 sessions in 14 rats).