“…However, in the developmental literature, the lack of consistency in identified frequency band ranges reduces the ability to generalize findings across studies (Orekhova, Stroganova, Posikera, & Elam, 2006). A number of studies have identified developmental changes in topography and peak low-frequency NREM between 3 and 12 Hz across early to mid childhood in both wakefulness ( Orekhova, Stroganova, & Posikera, 1999;Orekhova et al, 2006) and sleep (Kurth et al, 2010;Samson-Dollfus, Nogues, Menard, Bertoldi-Lefever, & Geffroy, 1983;Sankupellay et al, 2011;Scher, Sun, Steppe, Guthrie, & Sclabassi, 1994), Furthermore, in work establishing infant correlates of adult EEG, comparable signals tend to occur at lower frequencies in younger compared to older participants. For instance, Marshall et al (2002) documented an increase in the alpha signal in awake infants across the first year ranging from 6-7 Hz at 5 months to 9 Hz at age 4 years.…”