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. 2009 May 25;4(5):e5675. doi: 10.1371/journal.pone.0005675

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Yordanova et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Grand average event-related slow potentials for the two sleep groups, Early-NG and Late-NG, for the pre-sleep period. (B) Mean reaction times and standard deviations for different responses (response numbers R1 to R7, and Enter) presented together with the 1-s time windows (1 to 8) used for SP measurements. SP measurement starts 1.5 s after string appearance in order to avoid the influence of the late ERP components. Response numbers are conditionally divided into two groups (response types) according to their position in the string and are labeled UNPREDICTABLE and PREDICTABLE. At the bottom, min-max transformed grand average maps for the two response types are shown. (C) Regions of interest used for SP analysis: MF - middle frontal, LFT - left fronto-temporal, RFT - right fronto-temporal, LC - left central, RC - right central, MCP - middle centro-parietal, LOP - left occipito-parietal, ROP - right occipito-parietal.