As seen in Figure 2a, in the ANOVA revealed that periadolescents also had significantly higher energy values than adults to the infrequent (target) tone in the delta (F=43.1, df=1,56, p<0.001), theta (F=8.4, df=1,56, p=0.005), alpha (F=18.3, df=1,56, p<0.001), and beta (F= 17.7, df=1,56, p<0.001) frequency ranges in frontal cortex (FZ) and in the delta (F=23.4, df=1,56, p<0.001), theta (F=14.6, df=1,56, p<0.001), alpha (F=13.9, df=1,56, p<0.001), and beta (F=9.7, df=1,56, p=0.003) frequencies in the central cortex (CZ). Significant reductions in energy were also seen in the adults as compared to the periadolescents to the infrequent (target) tone at parietal sites (PZ) in the delta (F=30.5, df=1,56, p<0.001), theta (F=23.5, df=1,56, p<0.001), alpha (F=8.6, df=1,56, p=0.005) and beta (F=7.6, df=1,56, p=0.008) frequency ranges, as seen in Table 3. Grand averages of the energy values for the entire group of participants (n=57) given the active task, to the infrequent (target) tone for the periadolescents and adults, are presented in Figure 3.
