the late parietal old/new effect, which is widely considered an electrophysiological correlate of conscious recollection.93 In three independent studies, we found largely preserved late positive old/new effects in patients over mid-parietal sites, but markedly reduced old/new effects over left lateral parietal regions.81,82,84 While the current finding of a reduced left-lateralized source in patients supports the idea that the added cognitive demand in silent-counting oddball tasks may increase the likelihood of observing lateralized ERP reductions in schizophrenia, particularly when employing a conventional analysis of volume-conducted surface potentials using a bilateral recording reference (linked-ears or -mastoids), it also provides evidence that this silent count effect is not directly linked to classic N2 or P3 but rather to a distinct component likely associated with working memory or other cognitive processes.
