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This study investigated the effect of two forms of intensive speech treatment, (a) respiration (R) and (b) voice and respiration (Lee Silverman Voice Treatment [LSVT]), on the speech and voice deficits associated with idiopathic Parkinson disease. Forty-five subjects with Idiopathic Parkinson disease completed extensive pretreatment neurological,(More)
  • Y Horii
  • 1983
This study investigated the correlation between a physical measure of oral-nasal coupling and perceived hypernasality in speech. A modified accelerometric method was utilized to extract distributional characteristics of a ratio of the nasal accelerometric amplitude to the voice amplitude during simulated hypernasal reading by 11 female talkers. Perceived(More)
  • Y Horii
  • 1980
Vocal shimmer during the sustained phonation of /a/, /i/, /u/ was investigated for thirty-one adult male speakers using an automatic analysis program. The results showed an overall average shimmer of 0.39 dB with a critical value of 0.98 dB. Significant correlations were found among shimmer, jitter and fo standard deviation.
This study was primarily motivated by the need to establish the correspondence between auditory abilities and laryngeal function. Just noticeable differences (JNDs) were obtained for the open quotient and speed quotient of the glottal flow waveform. The quotients were synthesized for both the glottal flow alone, and for the output pressure signal after the(More)
Small cycle-to-cycle variations of voice fundamental frequency (vocal jitter) were examined for sustained phonations of vowels (/i,a,u/) produced by 20 young adults and 20 older adults. Jitter was measured by an automatic fundamental frequency tracking program which utilized a peak-picking method of voice analysis. Results showed that the average jitter of(More)
Acoustic measures of phonatory instability (coefficient of variation for amplitude, coefficient of variation for frequency, shimmer, jitter, and harmonics-to-noise ratio), phonatory limits (maximum fundamental frequency range and maximum duration of vowel phonation), and the nasal-oral amplitude ratio were measured five times throughout a 6-month period(More)