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(a) Grand average event-related potentials to cue stimuli at the Cz electrode, showing the contingent negative variation in the 1300–1650 ms window. ADHD, Attention-deficit/hyperactivity disorder (light grey; red online); BD, bipolar disorder (mid grey; green online). Controls are shown in black. (b) Topographic maps for each group. For a colour figure, see the online version.
