Figure 4.

Butterfly plots of difference wave t-scores (i.e., difference wave amplitude divided by difference wave standard error) at all electrodes. Difference waves were obtained by subtracting ERPs to tones following informative contexts from those following ambiguous contexts. Each waveform corresponds to a single electrode. Time windows analyzed via t_max permutation tests are indicated with dot-dashed lines. Critical t-scores are indicated by dashed lines. If difference wave t-scores exceed critical t-scores then they significantly deviate from zero (α=0.05). The visualized time range is shorter (−100 to 800 ms) for ERPs time locked to tone offset because the EEG artifact correction procedure did not extend beyond 800 ms post-tone offset for many trials.