Figure 4.

T-maps of fNIRS activation data averaged across visual and auditory task blocks as well as both stimulation conditions (verum and sham) for incongruent following congruent (left) and incongruent following incongruent trials (middle) as well as the corresponding difference map (incongruent following incongruent—incongruent following congruent = Gratton contrast). Black numbers mark significant t-comparisons (against zero: left and middle; between conditions: right; corrected significance level of p < 0.01).