Effects of Volume, Pitch, and Phonation Type on Oscillation Initiation and Termination Phases Investigated With High-speed Videoendoscopy.
OBJECTIVE
This study aimed to investigate the effects of varying volume, pitch, and phonation types on the initiation and termination phases of vocal fold oscillation using high-speed digital videoendoscopy. Specifically, it addressed the effects of the variation of volume, pitch, and phonation type (normal, pressed, and breathy) on the transient duration of the vibrating glottal length (length transient duration, Tlen), the transient duration of the glottal area waveform (area transient duration, Tarea), the time offset between the beginning (or the end) of the full-length vibration and the full-amplitude vibration, TΔ, and the variation of the fundamental frequency during the vocal fold oscillation initiation and termination segments (pitch instability, %PI).


METHODS
A female subject with no voice problem produced voices with varying pitch and loudness, including comfortable pitch and comfortable loudness, normal pitch loud, high pitch and comfortable loudness, and high pitch and loud. Breathy and pressed phonations were also recorded. Each of the six phonation types was recorded six times, which resulted in 72 transient segments (each recording included both initiation and termination phases). Mixed model statistical analyses were employed to the five objective high-speed digital videoendoscopy parameters.


RESULTS
Preliminary findings demonstrated significant findings for voice type effects for the length and area transient durations for the oscillation initiation segment but not for the oscillation termination segment.


CONCLUSIONS
This study demonstrates that voice types appear to influence vibration initiation patterns more than the vibration termination patterns.
The Department of Communication Sciences and Disorders, Louisiana State University, Baton Rouge, Louisiana. Electronic address: mkunduk@gmail.com.
Melda
M
Kunduk
Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, New Orleans, Louisiana.
Takeshi
T
Ikuma
Department of Experimental Statistics, Louisiana State University, Baton Rouge, Louisiana.
David C
DC
Blouin
Department of Otolaryngology-Head and Neck Surgery, Louisiana State University Health Sciences Center, New Orleans, Louisiana.
Andrew J
AJ
McWhorter
D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D007828:Laryngoscopy; D009991:Oscillometry; D010363:Pattern Recognition, Automated; D010699:Phonation; D013061:Speech Acoustics; D013997:Time Factors; D014732:Vibration; D014741:Video Recording; D014827:Vocal Cords / Q000033:anatomy & histology / Q000502:physiology*; D014833:Voice Quality
High-speed videoendoscopy; Oscillation initiation; Oscillation termination; Vocal fold oscillation initiation segment; Vocal fold oscillation termination segment