Figure 5

Electrophysiological results and statistical comparison of LAURA source estimation between Happinnes and Neutral over significant TANOVA LPP time interval. (A) Statistical analysis of global ERP amplitude. Periods of significant differences of ERP amplitude (p < 0.01; duration >20 ms) at each electrode and time-point between conditions are displayed as coloured horizontal lines. Each horizontal line represents one scalp electrode. Different colours indicate different clusters of electrodes (as shown in Fig. 2); AL: anterior left; AM: anterior midline; AR: anterior right. CL: central left; CM: central midline; CR: central right. PL: posterior left; PM: posterior midline; PR: posterior right. (B) Global scalp electric field analysis: statistical analysis of global electric field strength. Black areas indicate time intervals of significant differences (p < 0.01; duration >20 ms) of Global Field Power (GFP) between conditions. (C) Global scalp electric field analysis: statistical analysis of global electric field topography (topographic analysis of variance, TANOVA). Black areas indicate time intervals of significant differences (p < 0.01; duration > ms) of global spatial dissimilarity index (DISS) between conditions. (D) Significant TANOVA time interval (372–612 ms after Face_2 onset). All significant voxels are coloured (t₍₁₈₎ > 2.88/< −2.88, p < 0.01): positive t values (red) indicate higher current source densities in Happiness than in Neutral; negative t values (blue) indicate higher current source densities in Neutral than in Happiness. LAURA solutions are rendered on MNI152 template brain (left hemisphere on the left side).