Fig. 7: Time-frequency analysis.
From: Affective information modulates slow-wave- and arousal-like responses during NREM sleep
Brain activity changes associated with the occurrence of KCs were assessed using a time-frequency analysis time-locked to the KC negative peak. The plots in the top panels refer to a frontal electrode (F3), while the bottom panels refer to a centro-parietal electrode (CP4). a Time-frequency signal decomposition for negative, neutral, and positive stimuli. The mean KC response (scaled to the right y-axis) is superimposed on the time-frequency results to better illustrate the relationship between the KC phase and power changes. b Significant differences for the contrasts between negative and neutral stimuli (left), and between positive and neutral stimuli (right) in two representative electrodes. Dark contours mark significant differences at p < 0.05, corrected. For each significant cluster, we calculated the percent power difference relative to the neutral condition (mean ± SEM). F3 electrode: negative vs. neutral, cluster 1 = 17.15 ± 5.44%; positive vs. neutral, cluster 1 = 31.39 ± 7.76%. CP4 electrode: negative vs. neutral, cluster 1 = 40.57 ± 10.06%, cluster 2 = 24.12 ± 7.47%; positive vs. neutral, cluster 1 = 74.71 ± 50.83%, cluster 2 = 46.24 ± 21.95%, cluster 3 = 27.27 ± 7.60%.
