Figure 4.

Column scatter plots (each data point is one duration measure) show difference scores for postoperative change in the central tendency (median) of syllable duration (black data points), intersyllable duration (gray data points), and motif duration (clear data points). Positive values indicate shorter postoperative durations whereas negative values indicate longer postoperative durations. Stars indicate significant postoperative change in median duration (Wilcoxon signed-rank tests). LMAN ablation produced a significant postoperative shortening of syllable duration (n = 45, p < 0.01), but a significant postoperative lengthening of intersyllable duration (n = 35, p < 0.05). As a result of these contrasting effects, LMAN ablation did not have a significant effect on motif duration (n = 10). Control surgery did not produce a significant effect on syllable duration (n = 38), intersyllable duration (n = 30), or motif duration (n = 10).