We should note that a midfrontal extension of the parietal old/new effect was present in the visual but not auditory modality (cf. discussion in Kayser et al., 2007). To the extent that this positive-going old/new difference reflects the midfrontal FN400 effect linked to item familiarity (e.g., Rugg and Curran, 2007), the present data do not provide evidence of abnormal implicit knowledge of previous word presentations in schizophrenia (cf. Tendolkar et al., 2002). However, as a continuous recognition memory paradigm does not specifically probe predictions stemming from the dual-process model of episodic memory, no definitive conclusions are possible.
