Fig. 2.

Group comparisons for principal components analysis derived event-related potentials waveforms to oddball target stimuli (A) averaged within group yield significant effects in the P3b range for component 1 (Pz maximum; dark shaded region) and in the N1 and P3a range for component 2 (FCz maximum; light shaded region). F-values for these effects are also presented along with (B) a bootstrapped p < 0.025 probability lines (thin horizontal lines). Time regions reaching significance at FWalpha< 0.05 (three consecutive bins) are highlighted. H = healthy comparison subjects; BDP = bipolar disorder with psychosis; BDNP(−) = bipolar disorder without psychosis without first-degree family history of psychosis; BDNP(+) = bipolar disorder without psychosis with first-degree family history of psychosis.