Means and standard errors for FRN amplitude and latency for reward, nonreward, and average feedback are presented in Table 2 by age group, gender, and total sample. ERP results are illustrated by average waveforms following reward and non-reward (overall, Figure 2), by sex (Figure 3), and by age (Figure 4) for the medial frontal cortical region around Fz (Geodesic Hydrocel Net, Figure 1). Based on our frontocentral electrode cluster, the FRN is clearly visible at ~280 msec post-feedback (Figure 2). We used an interval 200–350 msec to capture the FRN, computing the negative peak amplitude in this time window.
