Abstract
Summary Twenty-five young adult and 25 aged women, in good health, produced the vowel /a/ at three different intensity levels (soft, conversational, and loud) and read the first paragraph of the Rainbow Passage. Measures of vocal jitter ratio (JR), fundamental frequency (F 0 ) and F 0 SD were calculated from the vowel productions. Measures of average speaking fundamental frequency (SFF), SFF SD, and reading length were calculated from the reading passage. JR values between the young and aged speakers were found to be nonsignificant, whereas F 0 , SFF, F 0 /SFF SD, and reading length were all found to be significantly different between the two groups—the aged speakers exhibited lower F 0 and SFF values, and higher F 0 /SFF SD and reading length values, when compared to the younger speakers.
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