Figure 5 shows the grand mean CSD-ERSP plots, arranged as topographies, for patients and controls in each condition, while Figure 6 shows enlarged CSD-ERSP plots at sites FCz (ERS maximum) and CP2 (ERD maximum) for target and novel stimuli. For both groups, prominent ERS effects for target and novel stimuli are clearly present between 100 and 400 ms for spectra between delta and alpha frequencies (1–10 Hz), being most robust over midfrontal regions, particularly for novels. This is followed by alpha ERD effects, maximum for target stimuli beyond 400 ms, covering posterior sites but being most robust over the right centroparietal region. These alpha ERD effects were markedly reduced in patients compared to controls. However, the basic morphology of the time-frequency CSD component structure (i.e., sequence and timing across conditions) was nevertheless highly comparable across groups.
