Figure 1

T-maps showing hemodynamic (HbO) changes after stimulus presentation. The color-coding represents t-values obtained from paired t-tests between interval of interest [10–15 s] and baseline. Channels selected for further analyses are marked in blue. Top figure: t-maps for birhinal AcOH stimulation for the left and right hemispheres. Bottom figure: t-maps for birhinal EA stimulation for both hemispheres, respectively.