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A schematic illustration of the quantification of the NGA as the geometrical distance between Go and Nogo centroid in the anterior–posterior direction. Grand average curves of Go (Pz; black line) and Nogo (Cz; red line) trials for the group of healthy controls homozygous for the 10-repeat allele. The heads illustrate the distribution of the positive brain electrical field at the respective peak of the P300.
