Peak latencies and mean peak values of the corresponding N90stg and P170stg deflections in the grand-average ERPs for each ISI and each attention condition (sub-columns). Grand-average ERPs were formed by averaging all individually averaged ERPs for each patient, which weighted the grand-average ERP equally across subjects rather than by number of epochs recorded. Asterisks denote significant differences determined via the bootstrap sampling procedure as described in Table 2. Rightmost column presents a measure of the “attention effect”, calculated as the percentage ratio of the mean peak difference (AT – AA) relative to the minimum (N90stg) or maximum (P170stg) mean peak value.