Based on previous work (Crowley et al., in press, 2013; Eppinger, Mock, & Kray, 2009; Hämmerer, Li, Müller, & Lindenberger, 2011; Zottoli & Grose-Fifer, 2012), we expected to see increased theta spectral power for children compared to our younger and older adolescent groups. Although we did not present averaged ERP data here, our previous study found a decrease in average FRN amplitude with age (Crowley et al., in press) among children (n=91) who were a subset of those presented here. The lack of finding here for ERSP suggests that the reduction in FRN feedback amplitudes across age reflects a reduction in phase locking rather than a reduction in theta power across childhood and adolescence.
