Figure 4.

Representative frontal (ch 29) and posterior (ch 59) channels selected to indicate differences between ERPs to lexical and sentence component tasks and lexical and sentence conjunctions. Black areas indicate significant differences between conditions (P < 0.05) with the Wilcoxon signed rank test. Although the differences for the frontal channels are small, they are replicated at many frontal electrode sites and for both single and conjunction tasks and are confirmed by the t test (see Fig. 5).