Two sets of developmental effects emerged from the data. First, irrespective of reward versus non-reward feedback type, FRNs were larger in our youngest group (10–12 yrs.) and our early adolescent group (13–14 yrs.) compared to our older adolescent group (15–17 yrs.). These results were similar to Hämmerer et al. (2011) and Zottoli and Grose-Fifer (2011). Recently,Santesso et al. (2011) suggested a possible distinction between FRN tasks that involve learning and those that involve guessing/gambling, with the former possibly confounding learning effects with developmental effects on the FRN. Here we show that the magnitude of feedback responses differentiated our child/young adolescent group from our older adolescent group on a guessing-type task, suggesting that developmental effects, as those reported for learning-type tasks (Eppinger et al., 2009; Hämmerer et al., 2011; Zottoli and Grose-Fifer, 2011), are not likely a function of differences in rates or processes of learning. Second, we observed a significant decrease in peak latency across the 10–17 year developmental window we examined here. Consistent with Eppinger et al. (2009) andHämmerer et al. (2011), perhaps an increasing reliance on internal representations
