Abstract
This retrospective study reports subjective and objective measurements of vocal function on twenty-two subjects with spasmodic dysphonia (SD). Five types of data were collected: 1)perceptual voice judgments, 2)indirect laryngoscopic examinations, 3)videostroboscopic examinations, 4)vocal function examinations, and 5)acoustic recording. Data were compared for fourteen adductor spasmodic dysphonia (AD-SD) subjects and eight abductor spasmodic dysphonia (AB-SD) subjects, and sixty-nine subjects without voice complaints. Results demonstrate differences between the ADSD and AB-SD, and SD groups and normal group: perceptual characteristics differed between the AD-SD and AB-SD subjects; mean airflow rate was higher in the AB-SD group; and voice source was poorer for the AB-SD male subjects and the AD-SD female subjects. This suggests that a combination of subjective and objective -observations expand description of this disorder and should facilitate documentation of change resulting from treatment.

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