the earlier task-dependent effects, or substantially altered their overall amplitude, an intriguing finding was a selective enhancement of source activity over left lateral temporal sites only for silent count (cf. Figure 8 in Kayser et al.48). This effect was associated with the mid-frontal sink/centroparietal source factor, and was therefore observed for a time period when participants updated their memory in the silent count condition. If this effect is indeed due to the added cognitive demand when silently counting targets, it would be of particular interest to investigate whether it may be reduced in patients and may account for asymmetric P3 reductions in schizophrenia, which have been more frequently reported for silent-counting oddball tasks.
