Figure 7.

Region-of-interest analysis of the jICA-ERP source maps. A, B, Temporal course of the grand average jICA-ERP source activity in seven temporal and parietal ROIs in the syllable (full trace) and chirp (dotted trace) tasks, in the left (A) and right (B) hemispheres. The source activity is expressed as z-scores computed relative to the mean activity in the baseline period (−100 to −2 ms). The z-score values exceeding 1.65 were considered significant deviations from the baseline. Periods of significant task differences in each ROI are indicated by shaded rectangles. The ROIs (A and B, middle) correspond to regions activated more strongly in one of the tasks, and include the pSTG (blue), IPL (magenta), SPL (cyan), vPostCG (red), dPostCG (yellow green), vPreCG (green), and dPreCG (brown). C, Lateralization pattern along time (y-axis) in each ROI (x-axis), represented as periods of significantly stronger activity in the left (L; left of vertical line) or right (R; right of vertical line) hemisphere, is shown for the syllable (red) and chirp (yellow) tasks, and for periods of overlapping lateralization between tasks (striped yellow).