TABLE VII.
Results of a two-way ANOVA for all four contrasts, for each stimulus type separately. Denominator degrees of freedom are shown in the first line of each section, and reflect the fact that both contrast and age are between subjects factors. Numerator degrees of freedom are shown below. Exact p values are shown if less than 0.05. NS indicates nonsignificant effects.
| Stimulus type | df | F | p |
|---|---|---|---|
| Flat stimuli | |||
| Isolated vowel | 177 | ||
| Contrast | 3 | 15.04 | <0.001 |
| Age | 3 | 19.74 | <0.001 |
| Contrast×Age | 9 | 2.44 | 0.012 |
| Reiterated vowel | 177 | ||
| Contrast | 3 | 3.86 | 0.011 |
| Age | 3 | 18.20 | <0.001 |
| Contrast×Age | 9 | 2.32 | 0.017 |
| Reiterated syllable | 177 | ||
| Contrast | 3 | 26.45 | <0.001 |
| Age | 3 | 15.40 | <0.001 |
| Contrast×Age | 9 | 2.07 | 0.035 |
| Dynamic stimuli | |||
| Whole syllable | 181 | ||
| Contrast | 3 | 3.50 | 0.017 |
| Age | 3 | 12.48 | <0.001 |
| Contrast×Age | 9 | 0.47 | NS |
| 50% cough | 181 | ||
| Contrast | 3 | 16.80 | <0.001 |
| Age | 3 | 19.36 | <0.001 |
| Contrast×Age | 9 | 0.86 | NS |
| Pitch periods | 181 | ||
| Contrast | 3 | 108.87 | <0.001 |
| Age | 3 | 38.64 | <0.001 |
| Contrast×Age | 9 | 1.75 | NS |