Figure 3.

(A) Topographical distribution of probability of origins of scalp-SW in 30 healthy children. All-night high-density EEG at-home assessments were performed in 11 preschool children (2.0 – 4.9 years), 9 school-age children (5.0 – 8.9 years) and 10 adolescents (9.0 – 16.9 years). Dark colors refer to high probability of origins at the indicated electrode, light colors refer to low probability of scalp-SW origins. Data processing entailed band-pass filtering (0.5–40 Hz), rejection of artifact-containing channels and re-referencing to mastoids. A previously published algorithm was used for wave detection and computation of propagation delay, for details see [39, 71]. (B) Linear correlations of age with origin of scalp-SW. Pearson correlations were performed at each electrode. Red indicates significant positive correlation with age, while blue indicates negative correlation (p<0.05). The figure shows that with increasing age across childhood, scalp-SW are more likely to originate in frontal electrodes and less likely to originate in parietal channels.