Figure 5
From: (C)overt attention and visual speller design in an ERP-based brain-computer interface
Scalp distributions for the P1, N1, P2, N2, and P3 components. For visualization purposes, the intervals (depicted above the component labels) chosen for the components are slightly narrower than the intervals used in the ERP analysis. The shaded areas in the ERP plots correspond to the intervals for which topographies are shown underneath. The solid line refers to electrode Cz and the dotted line refers to the average of electrodes PO7 and PO8. In the overt attention condition, it is particularly N1 and P2 that yield high amplitudes for target intensifications. In the covert attention condition, P3 yields the highest amplitudes.