Figure 1.

Group average ERP - difference waveforms (ERPs to novel sounds minus ERPs to standard tone) obtained from normal sleeping and short sleeping individuals in “ignore” and “attend” tasks. The gray bar indicates the latency time window for analyzed mean amplitude of the MMN, P3a, and P3b components with significant differences between groups (for details see results). The schematic illustration of the head with positions of frontal (F3, Fz, and F4), central (C3, Cz and C4), and parietal (P3, Pz, and P4) electrodes selected for statistical evaluation is on the bottom of the figure.