ERPs time locked to the onset (0 ms) of critical words in semantically (top row) and grammatically (bottom row) congruent and incongruent sentences.

<p>Waveforms show ERPs for congruent and incongruent trials at the central-midline electrode Cz (a-b). Topographic maps show the mean amplitude difference between incongruent and congruent trials in the 300–500 ms (c) and 500–800 ms (d) time intervals relative to visual word onset (0 ms). Wavelet-based time-frequency representations (TFR) of EEG data for critical words in semantically (e) and grammatically (f) congruent and incongruent sentences at the central-midline electrode Cz. The plots show percent power changes relative to baseline as a function of time and frequency.