Fig. 4

ERPs elicited by congruent and incongruent visual articulations—a within-group overlay. a Grand average ERPs elicited by congruent and incongruent articulations are overlaid separately for the TD and H-SLI children. The N400 and LPC components are marked on the Pz site. Negative is plotted up. b Voltage distribution measured as mean amplitude between 380 and 630-ms post-articulation onset is shown for the N400 component (top) and between 930- and 1540-ms post-articulation onset for the LPC component (bottom). Note the greater negativity in the TD group over the posterior scalp. While larger in absolute terms, the LPC in the H-SLI group was not significantly different from that in the TD group