Figure 4
Final words. (Top) Grand-averaged ERPs recorded from left and right inferior frontal sites in response to idiomatic and literal phrases. This indicates the strong right-hemispheric lateralization of the anterior P3 component to idiomatic phrases. (Bottom) Two axial sections (deepness indicated below the head) of swLORETA inverse solution performed on the difference wave obtained by subtracting ERPs to literal from ERPs to idiomatic sentences in the time window 620-640 ms, corresponding to the peak of anterior late positivity. Grid spacing = 10 mm; estimated SNR = 3. The solution offered three strong sources of statistically significant activation explaining the surface difference-potential, one located in the left fusiform gyrus (BA 19), one in the left superior temporal gyrus (BA38), and one in the right medial frontal gyrus (BA9).