Multiple Electrophysiological Markers of Visual-Attentional Processing in a Novel Task Directed toward Clinical Use

Figure 2

Event-related potentials that isolate the P2, P3a, and P3b componentsfrom averages that do not take into account the side of the target stimulus (in target-present trials). We subtracted the average waveform from the frequent-target, frequent colour, condition (the most frequently occurring condition) from the same-colour (no-go) condition; the solid line shows this difference wave at Fz,while the dashed line shows this difference at Pz. The dotted line shows the difference wave computed by subtracting the frequent-target, frequent colour, condition from the infrequent-target-colourcondition, at Fz which would have been another way to evoke the P3a, according to classic oddball paradigms.