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Figure 4


Fig. 4. Normalized rates of bronchial airflow 25 ms before to 5 ms after a frequency jump (A) or the onset of subharmonics (B). Bifurcations occurred at time 0. Slopes of linear regressions over three different 5 ms periods were measured (25–20 ms before, 5–0 ms before, and 0–5 ms after bifurcation points, indicated by vertical lines). (A) Rates of bronchial airflow show greater variance in their slope 0–5 ms before and 0–5 ms after a frequency jump than at an earlier point in the syllable, where no NLP were observed (failed Levene's test of equal variances below the 5% level, P<0.05; variance at 25–20 ms prior to bifurcation, {sigma}2=0.8; 5–0 ms prior, {sigma}2=7.7; 0–5 ms after, {sigma}2=7.2). Airflow was normalized to percent of maximum flow rate during syllable. Grey lines, upward jump in frequency; black lines, downward jump. (B) Rate of bronchial airflow 25–20 ms prior, 5–0 ms prior and 0–5 ms after onset of subharmonics did not show significant differences in slope (passed Levene's test for equal variances well above the 5% level, P=0.21).





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