Fig. 5: Slow wave and sleep spindle analyses.
From: Aspects of tree shrew consolidated sleep structure resemble human sleep
a Example traces of NREM for the different species showing both slow waves and spindle band activity. Top row, signal filtered in the delta range (0.5–4 Hz) superimposed upon the wideband, shaded area, (0.5–45 Hz) signal. Arrows denote slow wave events. Bottom row, the same signal, but filtered in the spindle range (10–16 Hz), with arrows indicating spindle events. Note the co-occurrence of slow waves and bursts of spindle band activity. b Group averaged distribution of the coupling event across species, rats n = 5, tree shrews n = 4, humans n = 5. Histograms show the group average distribution of slow wave-spindle coupling events in percentages over the time course of NREM sleep divided in 40 bins per recording (error bars indicate ±SEM). Note the black line represents the section of the first five bins containing coupling events during the beginning of the sleep period that were used for statistical comparison. Error bars reflect the standard error of the mean.
