Masako Tamaki, Ji Won Bang, Takeo Watanabe, Yuka Sasaki 

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Night Watch in One Brain Hemisphere during Sleep Associated with the First-Night Effect in Humans  Masako Tamaki, Ji Won Bang, Takeo Watanabe, Yuka Sasaki  Current Biology  Volume 26, Issue 9, Pages 1190-1194 (May 2016) DOI: 10.1016/j.cub.2016.02.063 Copyright © 2016 Elsevier Ltd Terms and Conditions

Figure 1 SWA Asymmetry in the DMN during Slow-Wave Sleep in Association with the FNE (A) SWA in the DMN during slow-wave sleep. The red bars show the left hemisphere, and the blue bars show the right hemisphere. The values are mean ± SEM. Asterisks indicate a significant difference in the post hoc tests after the four-way repeated-measures ANOVA (∗p < 0.05). (B and C) Scatter plots for the asymmetry index of DMN SWA against the sleep-onset latency for day 1 (r = −0.68, p = 0.022) (B) and day 2 (r = 0.03, p = 0.935, n.s.) (C). ∗p < 0.05. The correlation coefficient on day 1 was significantly different from day 2 (zpf10 = −1.99, p = 0.046). See Figure S1 for SWA in other networks, details of ANOVA results, and details of the asymmetry index. See also Figure S2 for additional data on SWA. Current Biology 2016 26, 1190-1194DOI: (10.1016/j.cub.2016.02.063) Copyright © 2016 Elsevier Ltd Terms and Conditions

Figure 2 Brain Responses during Slow-Wave Sleep (A) The amplitudes of the brain responses to deviant sounds in the left (red) and right (blue) hemispheres (μV). Asterisks indicate a significant difference in the post hoc tests after the three-way repeated-measures ANOVA (∗∗p < 0.01, ∗p < 0.05). (B) The amplitudes of the brain responses to standard sounds in the left (red) and right (blue) hemispheres (μV). The values are mean ± SEM. See Figure S3 for additional information regarding brain responses including detailed results of the ANOVA, time course, and the brain responses in other sleep stages. Current Biology 2016 26, 1190-1194DOI: (10.1016/j.cub.2016.02.063) Copyright © 2016 Elsevier Ltd Terms and Conditions

Figure 3 Arousals Followed by Deviant Sounds Presented during Slow-Wave Sleep (A) The total number of arousals per minute during slow-wave sleep. There was a significant difference in the number of arousals per minute between days (Wilcoxon signed-rank test, z12 = 3.18, p = 0.002). (B) The percentage of arousal occurrences that followed left-hemisphere trials (red) and right-hemisphere trials (blue). The values are mean ± SEM. ∗∗∗p < 0.005, ∗p < 0.05; the false discovery rate was controlled to be at 0.05. Current Biology 2016 26, 1190-1194DOI: (10.1016/j.cub.2016.02.063) Copyright © 2016 Elsevier Ltd Terms and Conditions

Figure 4 Awakening and Behavioral Responses Followed by Deviant Sounds (A) The number of subjects who were woken in the left-hemisphere (red) and right-hemisphere (blue) trials. The numbers of subjects who were woken on the left-hemisphere and right-hemisphere trials were significantly different between days (McNemar’s test, p = 0.033). The number of subjects who were woken on the left-hemisphere trials was significantly larger than chance on day 1 (Wilcoxon signed-rank test, z10 = 2.11, p = 0.035). (B) The reaction time between the deviant sound and the finger tapping. The reaction time was significantly faster on day 1 than day 2 (Wilcoxon signed-rank test, z10 = 2.31, p = 0.021). The values are mean ± SEM. ∗p < 0.05. See Figure S4 for additional information on the reaction time. Current Biology 2016 26, 1190-1194DOI: (10.1016/j.cub.2016.02.063) Copyright © 2016 Elsevier Ltd Terms and Conditions