Figures 1 and 2 show the grand mean CSD waveforms separately for patients and controls, comparing differences between conditions. Figure 3 directly compares the CSD waveforms of both groups for target and novel stimuli at selected midline sites. In close agreement with our previous findings for this novelty oddball paradigm (Tenke et al., 2010), N1 sinks peaking at about 135 ms over medial-central sites (C3/4) were followed by temporal N1 sinks (170 ms, T7/8) in all conditions. A novelty vertex source (NVS; 270 ms, Cz) was exclusively observed for novel stimuli. In contrast, a P3b source (380 ms, Pz) was most prominent for target stimuli, as was a response-related mid-frontal sink (FRN; 540 ms, Fz; cf. Kayser & Tenke, 2006a; Kayser et al., 2007).5 The morphology of this CSD component structure (i.e., sequence, timing and amplitudes) was highly comparable across groups.
