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. Author manuscript; available in PMC: 2009 Jun 30.
Published in final edited form as: Sleep Med Rev. 2007 Aug;11(4):277–293. doi: 10.1016/j.smrv.2007.05.001

Figure 1.

Figure 1

Grand-average ERPs following presentation of frequently occurring standard tones (dotted line), and rarely presented target tones (dashed line) and novel, environmental sounds (solid line) are illustrated. Two different groups of subjects were tested, control subjects who were not sleep deprived (NSD) and a totally sleep deprived (TSD) group. The TSD group was also recorded following recovery sleep (RS). From 19 with permission. Negativity at the scalp relative to the reference is traced as an upward deflection in this and all other figures.