In this video, Dr. Robert Bastian reviews the various types and subtypes of a rare neurological voice disorder called spasmodic dysphonia (SD). Numerous voice examples are included, along with video of the vocal cords.

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SD is a rare neurological disorder caused by laryngeal dystonia, and it interferes with the smooth functioning of the voice. Tiny spasms of the vocal cords may cause the voice to catch or cut out, strain or squeeze away, and sometimes to drop momentarily to a whisper. Those watching this tape will hear examples of the many types of SD.
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Chapters
0:00 Introduction
0:30 Overview
0:40 Normal voice samples
1:03 Abnormal voice samples
1:30 Definition of Spasmodic Dysphonia (SD)
2:04 ADductory variants of SD
3:36 ABductory variants of SD
4:35 Do you have one of these variants?

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