A benign neurological voice disorder caused by laryngeal dystonia. Abductory SD interferes with smooth flow of the voice as follows: During running speech, the voice intermittently drops out to a whisper. AB-SD is also called intermittent whisper phonation, and comprises about 10% of all cases of spasmodic dysphonia. See also tonic variant spasmodic dysphonia.
Posted in Glossary.