Figure 2: Stimulus-locked event-related potentials at selected midline electrodes separately for target and non-target trials, for the first (T1) and the second test session (T2) as well as for the cognitive training group, the no-contact control group and the social control group. Note that the P2 is the first pronounced positive peak with a maximum at Cz, and the P3b is the second broad positive peak with maximal amplitudes at CPz and Pz.