Fig. 5.

fNIRS results (time courses). Grand average time courses across all participants for pre- and post-tests are depicted (pre: light, dashed lines; post: solid dark lines). Increases in [oxy-Hb] and decreases in [deoxy-Hb] signal activation of the underlying brain area. Note that the here illustrated PREPOST comparison only yielded statistically significant effects for the decrease in [deoxy-Hb], although in some ROIs (e.g. left FRTMP) [oxy-Hb] shows the expected mirror response. Large bold * denotes main effect for PREPOST over right frontal ROI (FRONT); smaller * on left hemispheric ROIs (FRONT, FRTEMP and TEMP) denotes that post-hoc tests of interactions showed the PREPOST effect (see Table 1 and Fig. 6 for details). The inset illustrates the GLM-based analysis: the stimulus (modeled as a 2 s event) was convolved with the canonical hrf, yielding predictors for all conditions. Using these predictors the GLM provides β-values for each condition. The shaded areas sketch the best fit of the predictor to the measured data. For bar-plot representations of all significant results please refer to Fig. 6 and Table 1 (lower part).