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Grand average waveforms for each Reward X Accuracy condition time-locked to the onset of the feedback stimuli (i.e., green square for reward/correct, red square for reward/error, yellow square for no reward/correct and error) for the ADHD (left) CTRL (right) groups at Fz, FCz, Cz and Pz. The boxes reflect the window selected to calculate mean amplitude for the FRN.
