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. Author manuscript; available in PMC: 2009 Sep 5.
Published in final edited form as: Nature. 2008 Dec 14;458(7234):73–77. doi: 10.1038/nature07615

Figure 4.

Figure 4

Entropy variance (EV) changes after a night of sleep. a, Mean daily EV for bird vocalisations. Data for each bird were normalised by dividing within-day means by mean of the 4 nights preceding exposure. b, EV of all sounds produced by one bird across 15 days, smoothed by 40 data points within each day. EV increase across second day of training is achieved across morning singing. c, EV daily trends, averaged across all (non-manipulated) birds in 2-hour bins (± SEM) for the day before training onset (black), first day of training (blue), second day of training (red) and the average of the 2nd through 5th days of training (green).